A stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land and its application method

Abstract

This invention belongs to the field of agricultural planting and soil improvement technology, and particularly relates to a stress-resistant and yield-increasing fertilization composition for grain crops on reclaimed land and its application method. The fertilization composition consists of a basal fertilizer composition and a topdressing composition: the basal fertilizer composition includes compound fertilizer, organic fertilizer, and humic acid substances; the topdressing composition corresponds to the stress resistance and nutritional needs of crops at the jointing, booting, and grain-filling stages, including topdressing compositions for the jointing, booting, and grain-filling stages, wherein: the topdressing composition for the jointing stage consists of high-nitrogen water-soluble fertilizer and mineral-derived potassium humate; the topdressing composition for the booting stage consists of balanced water-soluble fertilizer, sugars, and compound amino acids; and the topdressing composition for the grain-filling stage consists of high-potassium water-soluble fertilizer, monosaccharides, and compound amino acids. Utilizing these technical solutions, this invention provides a stress-resistant and yield-increasing fertilization composition for grain crops on reclaimed land with good yield-increasing and stress-resistant effects and excellent economic benefits, as well as its application method.

Description

Technical Field

[0001] This invention belongs to the field of agricultural planting and soil improvement technology, and in particular relates to a stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land and its application method. Background Technology

[0002] This invention belongs to the field of agricultural planting and soil improvement technology, with a core focus on high-yield cultivation of grain crops and improvement of soil quality on reclaimed farmland. Reclaimed farmland, having been deprived of normal agricultural production for a long time, generally suffers from problems such as degraded soil structure (high bulk density, low porosity, poor aeration and permeability), nutrient imbalance (deficiency of organic matter and available nutrients), low soil biological activity, and salinization or compaction in some plots. These issues restrict crop root growth and weaken its resistance to adverse conditions such as low temperatures, drought, and pests, severely limiting the yield and quality of grain crops. Therefore, developing an integrated technical solution encompassing "soil improvement - nutrient supply - stress resistance and yield increase" has become a core need in this field.

[0003] Currently, the main technologies for increasing crop yields and improving soil in arable land include the following categories: First, increasing the application of organic fertilizers to improve soil structure by supplementing organic matter, but this has the problems of slow nutrient release and slow effect; Second, optimizing the application of chemical fertilizers, such as formula fertilization and topdressing in multiple applications, focusing on improving the utilization rate of chemical fertilizers, but with limited effect on soil improvement and crop stress resistance; Third, applying soil conditioners such as humic acid and biochar, but their effects are not fully realized when used alone; Fourth, foliar topdressing to supplement nutrients, but existing products are mostly single-nutrient types, lacking stress resistance function and insufficient targeted application.

[0004] Among them, patent CN111357454A (High-Quality Wheat Soil Improvement and Efficient Water and Fertilizer Utilization Method) adopts a three-stage scheme for high-quality wheat cultivation: "base fertilizer + integrated water and fertilizer topdressing + late-stage foliar spraying". In the base fertilizer stage, organic bio-fertilizer and bio-bacterial fertilizer are applied in combination with compound fertilizer or slow-release fertilizer, and deep plowing is used to improve and revitalize the soil. In the topdressing stage, an integrated water and fertilizer model is adopted, with targeted application of high-nitrogen water-soluble fertilizer during the greening stage and the heading stage to achieve simultaneous water and fertilizer supply. In the later stage, potassium dihydrogen phosphate and high-potassium, low-nitrogen, and low-phosphorus water-soluble fertilizer are sprayed on the leaves to improve quality and efficiency and prevent hot and dry winds. This technology, through the combination of organic and inorganic fertilizers and the synergistic regulation of water and fertilizer, achieves increased wheat yield and improved water and fertilizer utilization efficiency.

[0005] Although existing technologies (including the aforementioned comparative documents) have achieved certain results in increasing crop yield and improving the efficiency of water and fertilizer use, the following unresolved technical problems still exist for the specific soil obstacles and crop stress resistance requirements of reclaimed land:

[0006] Lack of precise improvement plans tailored to the characteristics of reclaimed land: The comparative document focuses on soil improvement and quality enhancement of conventional high-quality wheat fields, without fully considering the special obstacles caused by long-term fallow of reclaimed land, such as extremely low soil biological activity, poor nutrient cycling efficiency, and high risk of salinization. Its base fertilizer formula (organic bio-fertilizer + bio-bacterial fertilizer) is difficult to quickly repair the degraded soil structure of reclaimed land and cannot meet the dual needs of crops in reclaimed land for both readily available soil nutrients and long-lasting fertility.

[0007] Topdressing lacks a phased and targeted design for stress resistance: The topdressing in the comparative document only focuses on nitrogen and potassium nutrient supplementation (high nitrogen during the greening period and high potassium in the later stage), without designing functional formulas for specific stresses during the key growth stages of crops—such as late spring frost during the jointing stage, diseases during the booting stage, and hot and dry winds during the grain-filling stage, which are frequently encountered by crops in reclaimed land. It also lacks the synergistic combination of stress-resistant functional substances such as potassium humate, amino acids, and sugars, and cannot fundamentally enhance the crop's stress resistance.

[0008] The existing technologies (including the prior art) have failed to achieve a systematic synergy between soil improvement and stress resistance and yield increase: The existing technologies (including the prior art) have failed to form a closed loop between soil conditioners (such as humic acid) and staged stress resistance topdressing. The prior art does not involve the activation effect of substances such as humic acid on nutrients, which leads to a disconnect between soil improvement and crop stress resistance and nutrient supply. It is impossible to achieve the synergistic effect of "soil improvement-fertilizer-stress resistance", and it is difficult to cope with the multiple growth obstacles faced by crops in the reclaimed land.

[0009] The application of functional substances is singular and the effect is limited: the foliar spraying in the comparison document only uses potassium dihydrogen phosphate and conventional water-soluble fertilizer, lacking the synergistic effect of multiple functional substances. It cannot comprehensively improve crop stress resistance and nutrient absorption efficiency like "humic acid + amino acids + sugars". It is not effective in solving problems such as weak stress resistance and insufficient grain filling caused by soil infertility in reclaimed land crops. Summary of the Invention

[0010] The purpose of this invention is to provide a stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land and its application method, so as to solve the above-mentioned problems.

[0011] To achieve the above objectives, the present invention provides the following solution:

[0012] A fertilizer composition for stress resistance and yield increase of grain crops on reclaimed land, comprising a basal fertilizer composition and a top dressing composition:

[0013] The base fertilizer composition comprises compound fertilizer, organic fertilizer and humic acid substances, with the application rates of the three per mu being 40-60 kg, 800-1200 kg and 2-5 kg, respectively;

[0014] The topdressing composition corresponds to the stress resistance and nutritional needs of crops during the jointing, booting, and grain-filling stages, including topdressing compositions for the jointing, booting, and grain-filling stages, wherein:

[0015] The topdressing composition for the jointing stage consists of high-nitrogen water-soluble fertilizer and mineral-derived potassium humate, with application rates of 80-200g and 40-100g per mu, respectively.

[0016] The topdressing composition for the booting stage consists of balanced water-soluble fertilizer, sugars and compound amino acids, with application rates of 100-200g, 400-1000g and 60-150g per mu, respectively.

[0017] The topdressing composition for the grouting period consists of high-potassium water-soluble fertilizer, monosaccharides, and compound amino acids, with application rates of 120-250g, 250-600g, and 80-180g per mu, respectively.

[0018] Preferably, the compound fertilizer The mass ratio is 25-30:8-14:10-15, and the organic matter content of the organic fertilizer is ≥30%. The total nutrients are ≥4%, and the humic acid content of the humic acid substances is ≥40%, in order to meet the synergistic needs of soil improvement and nutrient supply in the reclaimed land.

[0019] Preferably, the compound fertilizer The mass ratio is 28:11:12.

[0020] Preferably, the high-nitrogen water-soluble fertilizer The mass ratio is 25-35:5-15:8-15, and the balanced water-soluble fertilizer... The mass ratio of the high-potassium water-soluble fertilizer is 18-22:18-22:18-22. The mass ratios are 10-18:3-10:35-45, which are adapted to the nutritional accumulation and stress resistance needs of crops at different growth stages.

[0021] Preferably, the humic acid substance is potassium humate granules, and the humic acid content of the potassium humate granules is ≥50% and the water-soluble humic acid is ≥40%, so as to enhance the effects of nutrient activation and soil aggregate structure improvement.

[0022] Preferably, the potassium fulvic acid content of the mineral-derived fulvic acid in the topdressing composition at the jointing stage is ≥50%, the sugar in the topdressing composition at the booting stage is brown sugar with a total sugar content ≥85%, and the monosaccharide in the topdressing composition at the grain-filling stage is glucose with a purity ≥99%, thereby improving the efficiency of the functional substances.

[0023] Preferably, the free amino acid content of the compound amino acid is ≥40%, and the total content of glutamic acid and proline accounts for 30-50% of the free amino acid content, so as to enhance the crop's resistance to low temperature, disease and hot dry wind.

[0024] A method for applying a stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land, using the aforementioned fertilizer composition, includes the following specific steps:

[0025] S1. Base fertilizer application: Before or during sowing, mix compound fertilizer, organic fertilizer and humic acid substances evenly and apply them to the soil. The application depth should be controlled at 10-20cm to ensure the supply of nutrients in the deep soil layers.

[0026] S2. Topdressing during the jointing stage: At the early stage of crop jointing, dissolve the topdressing composition for jointing stage in water and spray it on the leaves. The amount of liquid sprayed per acre is 30-40 liters.

[0027] S3. Topdressing during the booting stage: At the early stage of booting, dissolve the topdressing composition for booting stage in water and spray it on the leaves. The amount of liquid sprayed per acre is 35-45 liters.

[0028] S4. Topdressing during the grain-filling period: 10-15 days after the crop flowers, dissolve the topdressing composition for the grain-filling period in water and spray it on the leaves. The amount of liquid sprayed per acre is 40-50 liters.

[0029] Preferably, the topdressing during the jointing stage is sprayed at 9-11 am or 4-6 pm, the topdressing during the booting stage is sprayed in the evening or on a cloudy day, and the topdressing during the grain-filling stage is sprayed at 7-9 am or in the evening, avoiding the high temperature and strong light period to improve absorption efficiency.

[0030] Preferably, apply 10-20 kg / mu of urea as topdressing during the late heading stage, either by spreading it on the soil and then watering or by flushing it with water. During the grain-filling stage, topdressing should be applied 1-2 times depending on the climate conditions, with an interval of 7-10 days between each application.

[0031] Compared with the prior art, the present invention has the following advantages and technical effects:

[0032] Significant synergistic effects: A complete technical system is built on the basis of improving base fertilizer and strengthening topdressing in stages. Organic fertilizer, chemical fertilizer and humic acid work together to improve soil structure and provide rapid fertilization. Topdressing is used to accurately supplement nutrients and functional substances according to the crop growth stage, so as to achieve the unity of soil improvement and crop yield increase.

[0033] Increased yield and enhanced stress resistance: Wheat yield in reclaimed land increases by 60-90% compared to applying chemical fertilizer alone, and by 10-20% compared to applying chemical fertilizer in combination with organic fertilizer. Dry matter accumulation is increased by 60-70%. The crop is resistant to late spring frost during the jointing stage, disease during the booting stage, and hot and dry winds during the grain-filling stage, resulting in a comprehensive enhancement of the crop's overall stress resistance.

[0034] Highly effective soil improvement: Effectively reduces soil pH by approximately 11%, increases ammonium nitrogen availability by 29%, improves soil aggregate structure and water and fertilizer retention capacity, laying a good soil foundation for crop growth.

[0035] Highly efficient nutrient utilization: By activating nutrients with humic acid and applying foliar fertilizer in stages, nutrient utilization efficiency is increased by 15-20%, avoiding the nutrient loss problem of traditional fertilization.

[0036] Practical and easy to implement: Base fertilizer is applied once, and topdressing can be applied by foliar spraying, which reduces labor intensity; the topdressing composition has good water solubility and is easy to mix, making it suitable for large-scale production needs.

[0037] A win-win situation for both the economy and the environment: It can increase wheat production by more than 200 kg per mu, resulting in a significant net increase in income; it reduces the use of chemical fertilizers and nutrient loss, improves the soil ecology, and meets the requirements of green agricultural development.

[0038] Wide range of applications: Applicable to grain crops such as wheat, corn, and rice, and has good application effects on fallow land and land restored to cultivation after saline-alkali soil improvement.

[0039] By utilizing these technical solutions, the present invention provides a fertilizer composition for increasing yield and stress resistance of grain crops on reclaimed land, which has good yield-increasing and stress-resistant effects and excellent economic benefits, and its application method. Detailed Implementation

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below.

[0042] All raw materials used in this invention can be purchased from the market or prepared by conventional methods.

[0043] The compound fertilizer in this invention is a commercially available agricultural compound fertilizer that meets the requirements of the national standard GB / T 15063-2009 "Compound Fertilizers". The organic fertilizer in this invention is a commercially available organic fertilizer that meets the requirements of the national standard NY / T 525-2021 "Organic Fertilizers", and its main raw materials can be livestock and poultry manure, straw, oilseed cake, etc., which are produced through composting and fermentation. The humic acid substance in this invention is preferably mineral-derived potassium humate, which meets the requirements of the national standard NY / T 1106-2010 "Water-soluble Fertilizers Containing Humic Acid".

[0044] The water-soluble fertilizer in this invention is a commercially available water-soluble fertilizer that meets the requirements of the national standard NY / T 1107-2010 "Water-soluble Fertilizers Containing Macroelements". The potassium humate in this invention is extracted from sources such as lignite and weathered coal, and meets relevant agricultural standards. The compound amino acids in this invention are plant-derived amino acids or microbially fermented amino acids, meeting the requirements of the national standard NY / T 1429-2010 "Water-soluble Fertilizers Containing Amino Acids". The brown sugar in this invention is food-grade or agricultural-grade brown sugar with a total sugar content ≥85%. The glucose in this invention is industrial-grade or food-grade glucose with a purity ≥99%.

[0045] Unless otherwise specified, percentages and parts in this invention refer to percentages and parts by weight. Application rates in this invention are all per acre (667 square meters).

[0046] Example 1

[0047] This embodiment provides a fertilizer composition for stress-resistant and yield-increasing wheat cultivation on reclaimed land, including a base fertilizer composition and a top dressing composition.

[0048] The formula for the base fertilizer composition is as follows: compound fertilizer: 50 kg / mu; organic fertilizer: 1000 kg / mu; potassium humate granules: 3 kg / mu.

[0049] The topdressing composition includes: (1) Topdressing composition for the jointing stage: 120g / mu of high-nitrogen water-soluble fertilizer and 60g / mu of mineral-derived potassium humate. (2) Topdressing composition for the booting stage: 150g / mu of balanced water-soluble fertilizer, 650g / mu of brown sugar and 100g / mu of compound amino acids. (3) Topdressing composition for the grain-filling stage: 175g / mu of high-potassium water-soluble fertilizer, 400g / mu of glucose and 120g / mu of compound amino acids.

[0050] Among them, (1) compound fertilizer: =28:11:12, total nutrients ≥51%, in compliance with national standard GB / T15063-2009; (2) organic fertilizer: organic matter content 35%, Total nutrients 5%, in accordance with national standard NY / T 525-2021; main raw materials are chicken manure and straw, which are fermented for more than 60 days; (3) Potassium humate granules: humic acid content ≥50%, water-soluble humic acid ≥40%, in accordance with national standard NY / T 1106-2010; (4) High nitrogen water-soluble fertilizer: N- =30:10:10, total nutrients ≥50%, conforming to national standard NY / T 1107-2010; (5) Balanced water-soluble fertilizer: =20:20:20, total nutrients ≥60%, conforming to national standard NY / T 1107-2010; (6) high potassium water-soluble fertilizer: =15:5:40, total nutrients ≥60%, in compliance with national standard NY / T 1107-2010; (7) mineral-derived potassium fulvic acid: fulvic acid content ≥50%, water-soluble fulvic acid ≥45%; (8) compound amino acids: free amino acid content ≥40%, in compliance with national standard NY / T 1429-2010; the main amino acid composition is glutamic acid, proline, glycine, alanine, etc.; (9) brown sugar: total sugar content ≥85%, food grade; (10) glucose: purity ≥99%, food grade; (11) urea: nitrogen content ≥46%, in compliance with national standard GB / T 2440-2017.

[0051] Application method:

[0052] (1) Base fertilizer application: Before wheat sowing, mix compound fertilizer, organic fertilizer and potassium humate granules evenly, spread them on the ground, and then plow them into the soil to a depth of 15cm.

[0053] (2) Topdressing during the jointing stage: In the early stage of wheat jointing (late March), dissolve 120g of high nitrogen water-soluble fertilizer and 60g of mineral potassium humate in 35 liters of water and spray evenly on the wheat leaves. Spraying time is 9-11 am or 4-6 pm.

[0054] (3) Topdressing during the booting stage: At the early booting stage of wheat (around April 10), first dissolve 650g of brown sugar in a small amount of warm water, then add 100g of compound amino acids and mix evenly, and finally add 150g of balanced water-soluble fertilizer. Dilute with water to 40 liters and spray evenly on the wheat leaves. Choose the evening or cloudy day for spraying. Prepare and use immediately, and finish spraying within 2 hours.

[0055] (4) Topdressing in the late booting stage: When the flag leaf unfolds of wheat (late April), apply 15 kg / mu of urea, and then irrigate or apply it with water.

[0056] (5) Topdressing during the grain-filling stage: 10-15 days after wheat flowering (around May 15), completely dissolve 400g of glucose in water, add 120g of compound amino acids and mix well, and finally add 175g of high-potassium water-soluble fertilizer. Dilute with water to 45 liters and spray evenly on the wheat leaves, focusing on the flag leaves and ears. Spraying time is 7-9 am or evening. If there is high temperature and drought, the spraying can be repeated once after 7-10 days.

[0057] Example 2

[0058] This embodiment provides a fertilizer composition for stress-resistant and yield-increasing wheat cultivation on reclaimed land, including a base fertilizer composition and a top dressing composition.

[0059] The formula for the base fertilizer composition is as follows: compound fertilizer ( =28:11:12):50kg / mu; Organic fertilizer (organic matter content 30%) Total nutrients 4%): 1000 kg / mu; Potassium humate granules (humic acid content ≥50%): 3 kg / mu.

[0060] Topdressing composition includes: (1) Topdressing composition at the jointing stage: high-nitrogen water-soluble fertilizer ( =28:8:12) 100g / mu, mineral-derived potassium humate (humic acid content ≥50%) 50g / mu. (2) Topdressing composition during the booting stage: Balanced water-soluble fertilizer ( =20:20:20) 120g / mu, brown sugar (total sugar content ≥85%) 500g / mu, compound amino acids (free amino acid content ≥40%) 80g / mu. (3) Topdressing composition during the grouting period: high potassium water-soluble fertilizer ( =13:6:40) 150g / mu, glucose (purity ≥99%) 300g / mu, compound amino acids (free amino acid content ≥40%) 100g / mu.

[0061] The application method is basically the same as in Example 1, except that: the amount of pesticide solution sprayed during the jointing stage is 30 liters, the amount of pesticide solution sprayed during the booting stage is 35 liters, and the amount of pesticide solution sprayed during the grain filling stage is 40 liters.

[0062] Example 3

[0063] This embodiment provides a fertilizer composition for stress-resistant and yield-increasing wheat cultivation on reclaimed land, including a base fertilizer composition and a top dressing composition.

[0064] The formula for the base fertilizer composition is as follows: compound fertilizer ( =28:11:12): 50 kg / mu, organic fertilizer (organic matter content 40%) Total nutrients 6%): 1000 kg / mu, potassium humate granules (humic acid content ≥50%): 3 kg / mu.

[0065] Topdressing composition includes: (1) Topdressing composition at the jointing stage: high nitrogen water-soluble fertilizer ( =30:10:10) 150g / mu, mineral-derived potassium humate (humic acid content ≥50%) 80g / mu. (2) Topdressing composition during the booting stage: Balanced water-soluble fertilizer ( =20:20:20) 180g / mu, brown sugar (total sugar content ≥85%) 800g / mu, compound amino acids (free amino acid content ≥40%) 120g / mu. (3) Topdressing composition during the grouting period: high potassium water-soluble fertilizer ( =15:5:40) 200g / mu, glucose (purity ≥99%) 500g / mu, compound amino acids (free amino acid content ≥40%, rich in glutamic acid and proline) 150g / mu.

[0066] The application method is basically the same as in Example 1, except that: 40 liters of liquid is sprayed during the jointing stage, 45 liters during the booting stage, and 50 liters during the grain-filling stage. Topdressing is applied twice during the grain-filling stage, with an interval of 7 days.

[0067] Example 4

[0068] This embodiment provides a fertilizer composition for stress-resistant and yield-increasing wheat cultivation on reclaimed land, including a base fertilizer composition and a top dressing composition.

[0069] The formula for the base fertilizer composition is as follows: compound fertilizer ( =26:10:13): 45kg / mu; organic fertilizer (organic matter content 32%) Total nutrients 4.5%): 900 kg / mu; Potassium humate granules (humic acid content ≥50%): 2.5 kg / mu.

[0070] Topdressing composition includes: (1) Topdressing composition at the jointing stage: high nitrogen water-soluble fertilizer ( =30:10:10) 110g / mu, mineral-derived potassium humate (humic acid content ≥50%) 55g / mu. (2) Topdressing composition during the booting stage: Balanced water-soluble fertilizer ( =20:20:20) 140g / mu, brown sugar (total sugar content ≥85%) 600g / mu, compound amino acids (free amino acid content ≥40%) 90g / mu. (3) Topdressing composition during the grouting period: high potassium water-soluble fertilizer ( =15:5:40) 160g / mu, glucose (purity ≥99%) 350g / mu, compound amino acids (free amino acid content ≥40%) 110g / mu.

[0071] The application method is exactly the same as in Example 1.

[0072] Example 5

[0073] This embodiment provides a fertilizer composition for stress-resistant and yield-increasing wheat cultivation on reclaimed land, including a base fertilizer composition and a top dressing composition.

[0074] The formula for the base fertilizer composition is as follows: compound fertilizer ( =30:12:14): 55 kg / mu, organic fertilizer (organic matter content 38%) Total nutrients (5.5%): 1100 kg / mu; Potassium humate granules (humic acid content ≥50%): 3.5 kg / mu

[0075] Topdressing composition includes: (1) Topdressing composition at the jointing stage: high nitrogen water-soluble fertilizer ( =28:8:12) 140g / mu, mineral-derived potassium humate (humic acid content ≥50%) 75g / mu. (2) Topdressing composition during the booting stage: balanced water-soluble fertilizer ( =20:20:20) 170g / mu, brown sugar (total sugar content ≥85%) 750g / mu, compound amino acids (free amino acid content ≥40%) 115g / mu. (3) Topdressing composition during the grouting period: high potassium water-soluble fertilizer ( =13:6:40) 190g / mu, glucose (purity ≥99%) 480g / mu, compound amino acids (free amino acid content ≥40%, rich in glutamic acid and proline) 140g / mu.

[0076] The application method is exactly the same as in Example 1.

[0077] Comparative Example 1

[0078] Apply chemical and organic fertilizers, but do not apply humic acid or apply stress-resistant water-soluble fertilizers as top dressing. Base fertilizer: Compound fertilizer ( =28:11:12) 50kg / mu, organic fertilizer (organic matter content 35%) Apply 1000 kg / mu of urea (5% total nutrients) mixed with wheat before sowing and then plow it into the soil. Topdressing: Apply 15 kg / mu of urea during the late heading stage of wheat (late April), and water after application. Other field management measures are the same as in Example 1.

[0079] Comparative Example 2

[0080] Apply chemical fertilizers, organic fertilizers, and humic acid, but do not apply stress-resistant water-soluble fertilizers as top dressing. Base fertilizer: Compound fertilizer ( =28:11:12) 50kg / mu, organic fertilizer (organic matter content 35%) Apply 1000 kg / mu of total nutrients (5%) and 3 kg / mu of potassium humate granules (humic acid content ≥50%), mixed together, before wheat sowing and then plowed into the soil. Topdressing: Apply 15 kg / mu of urea during the late heading stage of wheat (late April), after spreading and watering. Other field management measures are the same as in Example 1.

[0081] Comparative Example 3

[0082] Only chemical fertilizers are applied; organic fertilizers and humic acid are not used, nor is stress-resistant water-soluble fertilizer applied as top dressing. Base fertilizer: Compound fertilizer ( =28:11:12) 50kg / mu, apply before wheat sowing and plow into the soil. Topdressing: Apply 15kg / mu of urea during the late heading stage of wheat (late April), after spreading and watering. Other field management measures are the same as in Example 1.

[0083] Experimental Example 1

[0084] This experiment aims to verify the effects of different fertilization treatments on wheat grain yield, dry matter, soil pH, and soil nitrogen nutrient changes in reclaimed land.

[0085] S1. Experimental Preparation

[0086] The experiment was conducted from October 2024 to June 2025 on farmland in Henanzhai Town, Miyun District, Beijing. This plot of land was farmland that had been fallow for 5 years and was originally woodland. The soil type is loam, and the basic fertility is low to medium.

[0087] The soil in the experimental site had a pH of 7.15, an organic matter content of 10.55 g / kg, an available nitrogen content of 68.5 mg / kg (medium level), an available phosphorus content of 8.2 mg / kg (low), an available potassium content of 82.3 mg / kg (low), and a soil bulk density of 1.42 g / cm³ (high), which are typical characteristics of reclaimed farmland soil.

[0088] The wheat variety tested was Nongda 8156, a winter-growing medium-maturing variety with a growth period of about 240 days. It is a major variety cultivated in the Beijing area, with strong cold resistance and lodging resistance, and wide adaptability.

[0089] S2. Controlled Experiment Setup

[0090] The experiment employed a randomized block design, including multiple treatments such as a control (CK), comparative example, and implementation example, with each treatment replicated three times. Each plot covered 3 mu (200m x 10m), with 1-meter-wide protective rows between plots. All plots were flat, with generally consistent soil fertility.

[0091] Description of the experimental plot: The reclaimed land selected for this experiment is a typical plot of land that has been reclaimed after fallowing, and has the typical characteristics of reclaimed land. The soil basic fertility is moderate to low, with an organic matter content of 10.55 g / kg and low available phosphorus and potassium content. (1) The soil structure is poor, the bulk density is high (1.42 g / cm³), the aeration and water permeability are poor, and the root growth is restricted; (2) The soil organic matter content is low, the water and fertilizer retention capacity is poor, and the nutrient supply is insufficient; (3) During the experiment, the crops encountered a cold snap in late spring (late March 2025, with a minimum temperature of -2℃) and hot and dry winds during the grain filling period (mid to late May 2025, with a maximum temperature of ≥32℃ for 5 consecutive days and a relative humidity of <30%). The crops treated with CK had weak resistance and were more severely damaged. Although the yield of CK in this experiment was lower than the average level of normal plots in the local area (about 350-400 kg / mu), it was consistent with the actual situation of initial planting on reclaimed land and could truly reflect the yield increase effect of the technical solution of this invention under the conditions of reclaimed land.

[0092] S3, Field Management

[0093] (1) Sowing: The sowing time is October 15, 2024. The sowing amount is 15kg per mu. Mechanical row sowing is adopted with a row spacing of 20cm and a sowing depth of 3-5cm.

[0094] (2) Application of base fertilizer: Before sowing, mix the base fertilizer composition of each treatment evenly, spread it on the ground, and then use a rotary tiller to plow it into the soil to a depth of 15cm. After plowing, harrow it flat.

[0095] (3) Topdressing: Topdressing should be carried out at the corresponding growth stage according to each treatment plan. For foliar topdressing, a backpack electric sprayer is used, which has a good atomization effect and sprays evenly.

[0096] (4) Irrigation: Irrigate in a timely manner according to soil moisture throughout the entire growth period. The number of irrigations and the amount of water used for each treatment are the same. Irrigate once in winter (late November), once in early March, once in late March, once in mid-April, and once in early May. The amount of water used for each irrigation is about 40-50 m³ / mu.

[0097] (5) Disease, pest and weed control: Control measures are uniformly implemented according to local conventional methods, and the control measures are the same for all treatments. Chemical weeding is carried out before winter, aphid and spider mite control is carried out in spring, and Fusarium head blight prevention is carried out during the grain filling period.

[0098] S4. Collect materials and measure experimental data.

[0099] (1) Harvest and measure yield at maturity (June 10, 2025).

[0100] A 1-square-meter quadrat was randomly selected from each plot (avoiding the edge rows), and all above-ground plants were harvested. The total fresh weight, grain fresh weight, and straw fresh weight were measured separately. Then, all grains were harvested according to the plot area, naturally dried until the moisture content was below 13%, weighed, and converted into yield per acre.

[0101] Samples were taken to determine the moisture content of grains and straw. A drying method was used: the grains were blanched at 105℃ for 30 minutes, and then dried at 80℃ to constant weight. The moisture content was then calculated. The dry weight yield of grains and straw was calculated based on the moisture content.

[0102] Calculation formulas: Moisture content (%) = (Fresh weight - Dry weight) / Fresh weight × 100%; Dry weight (kg) = Fresh weight (kg) × (1 - Moisture content); Yield per mu (kg / mu) = Plot yield (kg) / Plot area (m²) × 667

[0103] (2) After wheat harvest, soil samples were collected from the 0-20cm soil layer in each plot, with 5 sampling points per plot (quincunx pattern). The samples were mixed evenly and approximately 1kg was collected using the quartering method. After the soil samples were air-dried, they were sieved through a 2mm sieve, and the following indicators were determined: Soil ammonium nitrogen was determined using the 2mol / L KCl extraction-flow analyzer method. Soil nitrate nitrogen was determined using the 2mol / L KCl extraction-flow analyzer method.

[0104] (3) Soil pH value was determined by potentiometric method, with a water-to-soil ratio of 2.5:1 (v / w).

[0105] S5, Data Processing

[0106] After data processing, SPSS 26.0 statistical software was used for analysis of variance and multiple comparisons (Duncan's method, significance level P<0.05). Data are expressed as mean ± standard deviation. Individual data points were corrected after verification to ensure accuracy and reliability.

[0107] The results obtained from this experiment are shown below:

[0108] (I) Output Effect Analysis

[0109] 1. Grain yield

[0110] Table 1. Effects of different fertilization treatments on wheat grain yield in reclaimed land

[0111] Note: Different lowercase letters after the data in the same column indicate significant differences between treatments (P<0.05).

[0112] Results Analysis:

[0113] As can be seen from Table 1, in Examples 1, 3, and 5 using the complete scheme of this invention, the dry weight yield of wheat grains reached 499.9-509.3 kg / mu, which is 77.4-80.7% higher than the control group with chemical fertilizer alone (CK) and 12.1-14.2% higher than the combination of chemical fertilizer and organic fertilizer (Comparative Example 1), showing a significant yield increase (P<0.05).

[0114] (1) The yield of Comparative Example 1 increased by 58.3% compared to CK, indicating that the application of organic fertilizer has a significant effect on increasing wheat yield in reclaimed land. This is mainly because organic fertilizer can improve soil structure, increase soil organic matter content, and provide a continuous supply of nutrients, thereby creating a better soil environment for wheat growth.

[0115] (2) Comparative Example 2 showed a 5.4% increase in yield compared to Comparative Example 1, indicating that the addition of humic acid had a certain promoting effect on yield increase, but the increase was limited. This suggests that simply adding humic acid without combining it with staged stress-resistant water-soluble fertilizer topdressing could not fully realize its yield-increasing potential.

[0116] (3) Example 1 showed a 6.9% increase in yield compared to Comparative Example 2 (502.4 vs 470.1), which was significant, fully demonstrating the important role of the phased stress-resistant water-soluble fertilizer topdressing package. The key to achieving this yield increase lies in: applying high-nitrogen water-soluble fertilizer combined with mineral-derived potassium humate during the jointing stage, which promoted stem and leaf growth while enhancing the crop's resistance to early spring low temperatures; applying balanced water-soluble fertilizer combined with sugars and amino acids during the booting stage, which improved the efficiency of ear and grain differentiation and disease resistance; and applying high-potassium water-soluble fertilizer combined with glucose and amino acids during the grain-filling stage, which promoted the translocation of photosynthetic products to the grains and ensured the smooth progress of the grain-filling process.

[0117] (4) The yield increase of Example 2 (lower limit formula) was 62.9%, which was significantly higher than that of CK, but lower than that of Examples 1, 3 and 5. This indicates that when the fertilizer application rate is at the lower limit, although it can meet the basic yield increase requirements, it fails to fully realize the yield increase potential of the reclaimed land.

[0118] (5) Example 3 (upper limit formula) has the highest increase in production, reaching 80.7%, but it is only 2.4 percentage points higher than Example 1 (78.3%). Considering that the material input of the upper limit formula increases by about 20%, from the perspective of economic benefits, Example 1 (preferred formula) has a better input-output ratio.

[0119] (6) The grain moisture content variation pattern shows that the grain moisture content of Examples 1, 3 and 5 is the lowest (3.7-3.8%), which is significantly lower than CK (4.8%), indicating that the grains are more mature and the grain filling is more complete.

[0120] 2. Dry matter accumulation

[0121] Table 2 Effects of different fertilization treatments on aboveground dry matter accumulation in wheat

[0122] Note: Different lowercase letters after the data in the same column indicate significant differences between treatments (P<0.05). Straw dry weight is greatly affected by differences in field management, and a larger standard deviation is normal.

[0123] Results Analysis:

[0124] As shown in Table 2, the total dry matter accumulation of Example 1 reached 1159.4 kg / mu, which was 62.9% higher than CK, 19.5% higher than Comparative Example 1, and 12.3% higher than Comparative Example 2, with significant differences (P<0.05).

[0125] (1) Changes in straw dry weight: The straw dry weight of Example 1 increased by 52.7% and 25.2% compared with CK and Comparative Example 1, respectively, and by 16.7% compared with Comparative Example 2. This significant increase was mainly attributed to the synergistic effect of applying high-nitrogen water-soluble fertilizer in combination with potassium humate during the jointing stage: high-nitrogen water-soluble fertilizer quickly replenished nitrogen and promoted stem and leaf growth; potassium humate enhanced the crop's resistance to low temperatures in early spring, protected chloroplast structure, and maintained photosynthetic function.

[0126] (2) Difference in the increase of grain and straw dry weight: The increase in grain dry weight (78.3%) was higher than that of straw dry weight (52.7%), indicating that the present invention not only promoted the growth of vegetative cells, but more importantly, improved the efficiency of photosynthetic products transport to grains. This effect mainly comes from: the balanced water-soluble fertilizer combined with sugars and amino acids during the booting stage optimized ear and grain differentiation; and the high-potassium water-soluble fertilizer combined with glucose and amino acids during the grain-filling stage promoted the transport of photosynthetic products from leaves to grains.

[0127] (3) Although humic acid was applied in Comparative Example 2, the total dry matter accumulation (1032.9 kg / mu) was significantly lower than that in Example 1 (1159.4 kg / mu), with a difference in increase of 12.3%. This indicates that the yield-increasing potential of humic acid can only be fully realized through the synergistic effect of a phased stress-resistant water-soluble fertilizer topdressing package.

[0128] (II) Analysis of Soil Improvement Effects

[0129] 1. Changes in soil pH

[0130] Table 3 Effects of different fertilization treatments on soil pH

[0131] Note: Different lowercase letters after the data in the same column indicate significant differences between treatments (P<0.05). pH change = post-harvest pH - pre-sowing pH; negative values ​​indicate a decrease in pH. There were no significant differences in pre-sowing pH among the treatments (P>0.05).

[0132] Results analysis:

[0133] As shown in Table 3, the soil pH value after harvest in the CK treatment was 6.87, which was basically the same as before sowing. The soil pH values ​​after harvest in the treatments with applied organic fertilizer (Comparative Example 1, Comparative Example 2, Examples 1 and 3) all decreased to 6.08-6.10, a decrease of 0.78-0.81 units compared to before sowing, and a decrease of 11.2-11.6% compared to CK, showing a significant regulatory effect (P<0.05).

[0134] This result indicates that organic fertilizer plays a dominant role in soil pH regulation: organic fertilizer releases organic acids during mineralization, which can neutralize soil alkalinity; organic fertilizer promotes soil microbial activity, and the organic acids produced by microbial metabolism further reduce soil pH. The soil pH decreased from 6.87-6.91 to 6.08-6.10, which is within the suitable range for wheat growth (5.5-7.0), and is beneficial to improving soil nutrient availability and root growth.

[0135] It is worth noting that Comparative Example 2 (with added humic acid) showed similar pH adjustment effects to Comparative Example 1 and Example 1, indicating that the main role of humic acid is in nutrient activation and crop stress resistance, rather than soil pH adjustment.

[0136] 2. Changes in soil nitrogen nutrients

[0137] Table 4. Effects of different fertilization treatments on soil nitrogen nutrients.

[0138] Note: Different lowercase letters after the data in the same column indicate significant differences between treatments (P<0.05).

[0139] Results analysis:

[0140] As can be seen from Table 4, the soil nitrogen nutrient content exhibits a regular change pattern after harvest.

[0141] (1) The soil ammonium nitrogen content in Comparative Example 1 increased significantly by 109.2% (P<0.05). This is mainly because the organic nitrogen in organic fertilizer needs to be released gradually through the mineralization process. In the later stage of wheat growth and after harvest, some organic nitrogen is still converted into ammonium nitrogen, maintaining a high level of ammonium nitrogen.

[0142] (2) The ammonium nitrogen content in soil of Comparative Example 2 decreased by 21.6% (3.42 vs 2.68 mg / kg) compared with Comparative Example 1, but was still 63.4% higher than that of CK. This change indicates that humic acid can promote the conversion of ammonium nitrogen to nitrate nitrogen and improve the efficiency of crop nitrogen absorption.

[0143] (3) The soil ammonium nitrogen content in Example 1 was further reduced by 20.9% compared to Comparative Example 2 (2.68 vs 2.12 mg / kg), but was still 29.4% higher than CK (P<0.05). This result indirectly proves that the nitrogen use efficiency of the present invention is high: on the one hand, the wheat yield in Example 1 is higher (grain yield of 502.4 kg / mu vs 470.1 kg / mu in Comparative Example 2), and the amount of nitrogen absorbed and utilized is greater; on the other hand, the synergistic effect of humic acid and the staged stress-resistant water-soluble fertilizer topdressing package improves the nitrogen absorption efficiency and utilization efficiency.

[0144] (4) Comparative analysis shows that the present invention achieves the nitrogen management goal of "high yield and low residue". The grain yield of Example 1 (502.4 kg / mu) was higher than that of Comparative Example 2 (470.1 kg / mu), an increase of 6.9%; the soil ammonium nitrogen residue in Example 1 (2.12 mg / kg) was lower than that in Comparative Example 2 (2.68 mg / kg), a decrease of 20.9%; the nitrate nitrogen content in Example 1 (12.29 mg / kg) was slightly higher than that in Comparative Example 2 (12.15 mg / kg), but remained within a reasonable range. This indicates that the present invention ensures the nitrogen nutrition required for high crop yield while maintaining an appropriate level of soil nitrogen, thus reducing the risk of environmental pollution.

[0145] (5) The nitrate nitrogen content in each fertilization treatment was 17.0-22.0% higher than that in the control (CK), but the differences between treatments were not significant. The nitrate nitrogen content remained relatively stable, indicating that the present invention effectively controlled the excessive accumulation of nitrate nitrogen while increasing nitrogen supply.

[0146] Considering the experimental data obtained in Example 1, it can be seen that the stress-resistant and yield-increasing fertilizer composition for grain crops in reclaimed land and its application method of the present invention show significant yield-increasing effects and soil improvement effects in wheat planting in reclaimed land.

[0147] (III) Economic Benefit Analysis

[0148] The technical solution provided by this invention has high economic benefits (material prices are based on market prices in Miyun District, Beijing in 2024):

[0149] From the perspective of increasing yield, the grain yield of Example 1 was 502.4 kg / mu (dry weight), while the grain yield of CK was 281.8 kg / mu (dry weight), resulting in an increase of 220.6 kg / mu. Calculated at the wheat market purchase price of 2.6 yuan / kg (autumn 2024 price), the increased yield revenue was 573.6 yuan / mu.

[0150] From the perspective of material input, compared to CK (single application of chemical fertilizer), the additional material inputs in Example 1 include: organic fertilizer: 1000kg × 0.40 yuan / kg = 400 yuan / mu, potassium humate: 3kg × 10 yuan / kg = 30 yuan / mu, high-nitrogen water-soluble fertilizer: 120g × 0.08 yuan / g = 9.6 yuan / mu, mineral-derived potassium humate: 60g × 0.06 yuan / g = 3.6 yuan / mu, balanced water-soluble fertilizer: 150g × 0.07 yuan / g = 10.5 yuan / mu, and brown sugar. 650g × 0.008 yuan / g = 5.2 yuan / mu, Compound amino acids (booting stage): 100g × 0.10 yuan / g = 10 yuan / mu, High potassium water-soluble fertilizer: 175g × 0.09 yuan / g = 15.8 yuan / mu, Glucose: 400g × 0.006 yuan / g = 2.4 yuan / mu, Compound amino acids (grain-filling stage): 120g × 0.10 yuan / g = 12 yuan / mu, Foliar spraying labor: 3 times × 8 yuan / time = 24 yuan / mu, Subtotal: 523.1 yuan / mu.

[0151] The net increase in revenue is:

[0152] 573.6 - 523.1 = 50.5 yuan / mu

[0153] Compared to Comparative Example 1, Example 1 showed an increased yield of 56.4 kg / mu (502.4-446.0), resulting in an increased profit of 146.6 yuan / mu. Increased inputs included: potassium humate: 30 yuan / mu, water-soluble fertilizer package: 51.5 yuan / mu, sugars: 7.6 yuan / mu, amino acids: 22 yuan / mu, manual spraying: 24 yuan / mu, totaling 135.1 yuan / mu. Net increased profit: 146.6 - 135.1 = 11.5 yuan / mu;

[0154] Compared to Comparative Example 2, Example 1 showed an increased yield of 32.3 kg / mu (502.4 - 470.1), resulting in an increased profit of 84.0 yuan / mu. Increased inputs included: water-soluble fertilizer package, 51.5 yuan / mu; sugars, 7.6 yuan / mu; amino acids, 22 yuan / mu; manual spraying, 24 yuan / mu; subtotal: 105.1 yuan / mu. Net increased profit: 84.0 - 105.1 = -21.1 yuan / mu (input slightly higher than increased profit).

[0155] Therefore, although the material input of this invention is significantly increased (523.1 yuan / mu) compared to applying chemical fertilizers alone, the net increase in income is still achieved at 50.5 yuan / mu due to the substantial increase in yield (220.6 kg / mu, an increase of 78.3%). More importantly, this invention improves soil quality (pH value decreases by 11.2%, and ammonium nitrogen availability increases by 29.4%), laying the foundation for the growth of subsequent crops and sustainable soil utilization, and has good ecological and long-term economic benefits.

[0156] Compared to Comparative Example 1, which already applied organic fertilizer, the present invention, by increasing humic acid and applying staged water-soluble fertilizer for stress resistance, achieves a net increase in income of 11.5 yuan / mu, while significantly improving crop stress resistance and reducing the risk of yield reduction due to abiotic stress. Compared to Comparative Example 2, which already applied humic acid, although the net increase in income for the current season was negative (-21.1 yuan / mu), considering the sustained effects of soil improvement and the enhancement of crop stress resistance, the present invention still has application value in multi-year planting. For growers seeking high and stable yields, the present invention can effectively reduce the risk of yield reduction caused by abiotic stress and ensure stable yields.

[0157] From a sensitivity perspective:

[0158] If the price of organic fertilizer decreases to 0.30 yuan / kg (bulk purchase price), the cost of organic fertilizer can be reduced by 100 yuan / mu (1000kg × 0.10 yuan / kg). Compared with the control (CK), the net increase in profit in Example 1 can be increased to 150.5 yuan / mu (50.5 + 100), making the economic benefits more significant. If the price of wheat rises to 3.0 yuan / kg, the net increase in profit in Example 1 compared with the control (CK) can be increased to 138.7 yuan / mu. Considering the long-term effects of soil improvement, the amount of organic fertilizer and humic acid used in the second year can be reduced by 30-50%, significantly reducing costs and increasing net profit.

[0159] (iv) Analysis of ecological benefits and sustainability

[0160] This invention improves soil through organic fertilizer, enhancing soil organic matter mineralization and nutrient cycling efficiency, and promoting soil ecosystem restoration. Humic acid activates nutrients, improving fertilizer utilization efficiency and reducing nutrient loss and environmental pollution. Experimental results show that Example 1 achieves high yields while maintaining moderate soil nitrogen residue (ammonium nitrogen 2.12 mg / kg), meeting the high-yield requirements of the current crop while avoiding the risks of nitrate leaching and groundwater pollution caused by excessive fertilization.

[0161] By applying fertilizer precisely in stages, this invention achieves on-demand nutrient supply, avoiding nutrient loss caused by large-scale, one-time fertilization in traditional methods. Foliar fertilization is rapidly absorbed and highly utilized, especially during critical growth stages when it supplements functional substances (potassium humate, amino acids, and sugars). This not only meets nutritional needs but also enhances crop resistance to stress, reduces the risk of yield reduction due to adverse conditions, and lowers pesticide usage.

[0162] Effective adjustment of soil pH (from 6.87 to 6.10) improved the alkaline soil environment of the reclaimed land, increased soil nutrient availability, and created more suitable conditions for crop root growth. This soil improvement effect is sustainable, laying the foundation for subsequent crop growth and improved arable land quality, and is in line with the long-term goals of arable land protection and quality construction.

[0163] In summary, the present invention balances economic, ecological, and social benefits, achieving a balance between increased production and income and environmental protection. It meets the requirements of green agriculture and sustainable development and has good value for promotion and application.

[0164] The embodiments and test examples described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A fertilizer composition for stress resistance and yield increase of grain crops on reclaimed land, characterized in that, The fertilizer composition consists of a base fertilizer composition and a top dressing composition: The base fertilizer composition comprises compound fertilizer, organic fertilizer and humic acid substances, with the application rates of the three per mu being 40-60 kg, 800-1200 kg and 2-5 kg, respectively; The topdressing composition corresponds to the stress resistance and nutritional needs of crops during the jointing, booting, and grain-filling stages, including topdressing compositions for the jointing, booting, and grain-filling stages, wherein: The topdressing composition for the jointing stage consists of high-nitrogen water-soluble fertilizer and mineral-derived potassium humate, with application rates of 80-200g and 40-100g per mu, respectively. The topdressing composition for the booting stage consists of balanced water-soluble fertilizer, sugars and compound amino acids, with application rates of 100-200g, 400-1000g and 60-150g per mu, respectively. The topdressing composition for the grain-filling period consists of high-potassium water-soluble fertilizer, monosaccharides, and compound amino acids, with application rates of 120-250g, 250-600g, and 80-180g per mu, respectively.

2. The fertilizer composition for stress resistance and yield increase of grain crops on reclaimed land according to claim 1, characterized in that: The compound fertilizer The mass ratio is 25-30:8-14:10-15, and the organic matter content of the organic fertilizer is ≥30%. The total nutrients are ≥4%, and the humic acid content of the humic acid substances is ≥40%, in order to meet the synergistic needs of soil improvement and nutrient supply in the reclaimed land.

3. The stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land according to claim 2, characterized in that: The compound fertilizer The mass ratio is 28:11:

12.

4. The stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land according to claim 1, characterized in that: The high-nitrogen water-soluble fertilizer The mass ratio is 25-35:5-15:8-15, and the balanced water-soluble fertilizer... The mass ratio of the high-potassium water-soluble fertilizer is 18-22:18-22:18-22. The mass ratios are 10-18:3-10:35-45, which are adapted to the nutritional accumulation and stress resistance needs of crops at different growth stages.

5. The stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land according to claim 1, characterized in that: The humic acid substance is potassium humate granules, and the humic acid content of the potassium humate granules is ≥50% and the water-soluble humic acid is ≥40%, so as to enhance the effects of nutrient activation and soil aggregate structure improvement.

6. The stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land according to claim 1, characterized in that: The fulvic acid content of potassium fulvicate from mineral sources in the topdressing composition at the jointing stage is ≥50%, the sugar in the topdressing composition at the booting stage is brown sugar with a total sugar content ≥85%, and the monosaccharide in the topdressing composition at the grain-filling stage is glucose with a purity ≥99%, thereby improving the efficiency of the functional substances.

7. The fertilizer composition for stress resistance and yield increase of grain crops on reclaimed land according to claim 1, characterized in that: The free amino acid content of the compound amino acid is ≥40%, and the total content of glutamic acid and proline accounts for 30-50% of the free amino acid content, so as to enhance the crop's resistance to low temperature, disease and hot dry wind.

8. A method for applying a stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land, characterized in that, The specific steps of using the fertilizer composition according to any one of claims 1-6 are as follows: S1. Base fertilizer application: Before or during sowing, mix compound fertilizer, organic fertilizer and humic acid substances evenly and apply them to the soil. The application depth should be controlled at 10-20cm to ensure the supply of nutrients in the deep soil. S2. Topdressing during the jointing stage: At the early stage of crop jointing, dissolve the topdressing composition for jointing stage in water and spray it on the leaves. The amount of liquid sprayed per acre is 30-40 liters. S3. Topdressing during the booting stage: At the early stage of booting, dissolve the topdressing composition for booting stage in water and spray it on the leaves. The amount of liquid sprayed per acre is 35-45 liters. S4. Topdressing during the grain-filling period: 10-15 days after the crop flowers, dissolve the topdressing composition for the grain-filling period in water and spray it on the leaves. The amount of liquid sprayed per acre is 40-50 liters.

9. The application method of the stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land according to claim 8, characterized in that, Topdressing during the jointing stage should be sprayed between 9-11 am or 4-6 pm; topdressing during the booting stage should be sprayed in the evening or on a cloudy day; and topdressing during the grain-filling stage should be sprayed between 7-9 am or in the evening, avoiding periods of high temperature and strong sunlight to improve absorption efficiency.

10. The application method of the stress-resistant and yield-increasing fertilizer composition for grain crops on reclaimed land according to claim 8, characterized in that, Apply 10-20 kg / mu of urea as top dressing during the late heading stage, either by spreading it on the soil and then watering or by applying it with irrigation water. During the grain filling stage, apply top dressing 1-2 times depending on the climate conditions, with an interval of 7-10 days between each application.

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