Cold-resistant growth-promoting nutrient solution for bluegrass in alpine region and application method thereof

Abstract

The invention relates to the technical field of concealed project acceptance, and discloses an alpine region bluegrass cold-resistant growth-promoting nutrient solution and an application method thereof.The nutrient solution is composed of main nutrient elements such as nitrogen, phosphorus and potassium and microelements such as iron, manganese, zinc, copper and boron, and amino acid substances such as glycine, alanine and proline are added; therefore, comprehensive and balanced nutrition support is provided. Through a scientific fertilization strategy, including three stages of seed treatment, seedling stage management and growth stage management, and in combination with a drip irrigation system and a foliage spraying technology, efficient utilization of nutrients and healthy growth of plants are ensured. According to the method, the growth speed and biomass of the bluegrass are remarkably increased, the soil structure is improved, the stress resistance of crops is enhanced, the nutrient utilization efficiency is improved, and finally the product quality and market value are improved; the comprehensive benefits are beneficial to promoting the sustainable development of agriculture in alpine regions.

Description

Technical Field

[0001] The present invention relates to the field of agricultural fertilizers, and particularly to a cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions and its application method. Background Art

[0002] As a gramineous plant widely distributed in alpine regions, Poa annua has important forage value in animal husbandry. However, the unique climatic conditions in alpine regions pose many challenges to the growth of Poa annua. These regions usually have low temperatures, short frost-free periods, and large diurnal temperature differences, resulting in a shortened growth cycle of Poa annua and limited biomass accumulation. In addition, the long soil freezing time, delayed thawing, and water changes during the freeze-thaw cycle make it difficult for Poa annua to absorb and utilize nutrients.

[0003] Traditional fertilization methods often struggle to meet the special needs of Poa annua in alpine regions. On the one hand, the solubility and effectiveness of conventional fertilizers are significantly reduced in low-temperature environments, leading to slow nutrient release and an inability to meet the nutritional conditions required for the growth of Poa annua in a timely manner. On the other hand, single or unbalanced fertilization methods are prone to causing soil nutrient imbalance and affecting the healthy growth of Poa annua. Therefore, how to provide a comprehensive, balanced, and highly efficient nutrient supply plan has become a key issue in improving the productivity of Poa annua in alpine regions.

[0004] In recent years, with the in-depth research of plant nutrition and the progress of technology, people have begun to focus on more precise and efficient fertilization methods such as foliar spraying and drip irrigation to improve the nutritional status of crops. Some studies have shown that the reasonable use of additives such as amino acid substances, trace elements, and plant growth regulators can effectively promote the growth and development of plants and enhance their stress resistance. However, for the special growth environment of Poa annua in alpine regions, the existing research is still relatively limited and lacks a systematic solution.

[0005] Therefore, the development of a new cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions and its scientific application method is of great significance for improving the production performance of Poa annua in this region. This nutrient solution needs to comprehensively consider the nutritional requirements of Poa annua at different growth stages, especially add components that help improve cold resistance, and through a reasonable application strategy, ensure the effective absorption and utilization of nutrients, so as to promote the healthy growth and development of Poa annua in a harsh environment. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions and its application method to solve the technical problems existing in the prior art.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] An anti-cold and growth-promoting nutrient solution for Poa pratensis in alpine regions, which is composed of the following components:

[0009] 5 - 8 g / L of nitrogen element, and the nitrogen element is provided by urea;

[0010] 2 - 4 g / L of phosphorus element, and the phosphorus element is provided by potassium dihydrogen phosphate;

[0011] 3 - 6 g / L of potassium element, and the potassium element is provided by potassium sulfate;

[0012] Trace elements, including 0.1 - 0.3 g / L of iron element, 0.05 - 0.2 g / L of manganese element, 0.05 - 0.15 g / L of zinc element, 0.02 - 0.08 g / L of copper element, and 0.02 - 0.06 g / L of boron element;

[0013] Amino acid substances, including 0.5 - 1.5 g / L of glycine, 0.5 - 1.5 g / L of alanine, and 0.5 - 2 g / L of proline;

[0014] Seaweed extract, with a concentration of 1 - 3 g / L.

[0015] Preferably, the pH value of the aqueous solution of the nitrogen element, phosphorus element, potassium element, trace elements, amino acid substances, and seaweed extract should be maintained at 6.0 - 7.5.

[0016] Preferably, a plant growth regulator can also be added to the nutrient solution. The plant growth regulator is any one or a combination of two of indolebutyric acid or naphthaleneacetic acid, and its total concentration in the nutrient solution is 0.05 - 0.2 g / L.

[0017] A method for applying the anti-cold and growth-promoting nutrient solution for Poa pratensis in alpine regions, including a seed treatment stage, a seedling stage management, and a growth stage management, which are specifically as follows:

[0018] Seed treatment stage: Put the Poa pratensis seeds into the nutrient solution and soak them for 12 - 24 hours at an immersion temperature of 20 - 25 °C, then take them out and rinse them clean with clean water, and carry out germination treatment. The germination temperature is controlled at 18 - 22 °C, and the humidity is maintained at 60% - 70%;

[0019] Seedling stage management: When the seedlings emerge and grow 2 - 3 true leaves, first irrigate them with the nutrient solution diluted to 1 / 500 - 1 / 1000 times, and then irrigate them with the nutrient solution with a concentration of 1 / 200 - 1 / 500 times every 5 - 7 days. In combination with foliar spraying, dilute the nutrient solution to 300 - 500 times and evenly spray it on both the front and back sides of the leaves 1 - 2 times a week;

[0020] Growth period management: Adopt a combined method of watering and drip irrigation. Every 3 - 5 days, inject the diluted nutrient solution through the drip irrigation system for 2 - 3 hours each time. Conduct a flood irrigation every 10 - 15 days. Mix the nutrient solution with water and evenly pour it on the soil around the plants. At the same time, adjust the fertilization amount according to the growth of the plants. Increase the application amount of the nutrient solution during the jointing stage and booting stage, and increase the nutrient solution concentration to 1 / 100 - 1 / 200 times. And continue with foliar spraying supplementation during the growth period. Dilute the nutrient solution to 200 - 300 times and spray it once every 7 - 10 days.

[0021] Preferably, during the germination process in the seed treatment stage, spray the seeds with clean water 1 - 2 times a day.

[0022] Preferably, in the management of the seedling stage, if the weather is sunny, the temperature is suitable, and the seedlings grow vigorously, appropriately increase the fertilization frequency; if it is rainy, the temperature is low, or the seedlings grow slowly, reduce the fertilization frequency.

[0023] Preferably, in the growth period management, the drip irrigation frequency is determined according to the growth of the plants and climatic conditions. If the plants grow rapidly and the climate is dry, appropriately increase the drip irrigation frequency; if the plants grow slowly and the climate is humid, reduce the drip irrigation frequency.

[0024] Preferably, 1 - 2 days before the flood irrigation, stop the drip irrigation first. Add the surfactant Tween - 20 during foliar spraying, and its concentration in the foliar spraying solution is 0.1% - 0.3%.

[0025] A cold - resistant and growth - promoting nutrient solution for Poa pratensis in alpine regions or its application method. Regularly monitor the soil nutrient content and pH value throughout the growth cycle, and timely adjust the nutrient solution formula and fertilization amount according to the monitoring results.

[0026] In summary, the present invention mainly has the following beneficial effects:

[0027] I. The main nutrient elements nitrogen (N), phosphorus (P), potassium (K) contained in the nutrient solution, as well as trace elements iron (Fe), manganese (Mn), zinc (Zn), copper (Cu) and boron (B), can effectively promote the root development of Poa annua. These elements are essential nutrients for plant growth, which can significantly enhance the absorption capacity of the roots, enabling the plants to obtain water and nutrients from the soil more efficiently; the organic components and trace elements in the nutrient solution can also promote the activity of rhizosphere microorganisms, improve the soil micro-ecological environment, and further support the healthy growth of the roots; the added amino acid substances such as glycine, alanine and proline not only provide an additional nitrogen source, but also serve as intermediate products of energy metabolism, participate in the synthesis of chlorophyll, thereby increasing the chlorophyll content and improving the photosynthesis efficiency; by enhancing photosynthesis, Poa annua can convert light energy into chemical energy faster, accelerate the synthesis and accumulation of carbohydrates, and thus increase the dry matter yield.

[0028] II. Regularly applying the cold-resistant and growth-promoting nutrient solution containing various nutrient elements can increase the organic matter content in the soil, improve the soil structure, make it more loose and breathable, and is conducive to the growth and expansion of plant roots; some components in the nutrient solution such as phosphates and sulfates can neutralize the alkaline substances in the soil, adjust the soil pH value, making it more suitable for the growth of Poa annua; using this nutrient solution can reduce the dependence on traditional chemical fertilizers, reduce problems such as soil compaction and acidification caused by excessive fertilization, and reduce the pollution risk of water bodies and the atmosphere caused by the loss of chemical fertilizers; by reasonably using the nutrient solution, precise fertilization can be achieved, avoiding resource waste, and promoting the development of agricultural production towards a green and sustainable direction.

[0029] III. The trace elements such as chelated iron, manganese sulfate, zinc sulfate, copper sulfate and borax specially added to the nutrient solution help to improve the physiological activity of Poa annua under low-temperature conditions, enhance the stability of its cell membrane, and prevent mechanical damage caused by the freezing and expansion of intracellular water; some trace elements such as zinc and copper can activate the antifreeze proteins in plants, increase the osmotic pressure of cell sap, lower the freezing point, and thus improve the cold resistance of plants; reasonable nutrient supply and the use of plant growth regulators can enhance the immune system of Poa annua and improve its resistance to pests and diseases. For example, plant growth regulators such as indolebutyric acid or naphthaleneacetic acid can promote the activity of defense enzymes in plants and enhance the self-defense ability of plants; the copper ions in the nutrient solution have antibacterial effects, which can inhibit the growth and reproduction of pathogenic bacteria in the soil and reduce the occurrence probability of diseases.

[0030] IV. Adopt a scientific fertilization strategy, precisely proportion according to the nutrient requirements of different growth stages of Poa annua, ensure that each nutrient can be fully utilized, and avoid waste. For example, pay attention to the supply of nitrogen during the seedling stage to promote leaf growth, and increase the proportion of phosphorus and potassium fertilizers during the growth stage to support the development of stems and roots; combine with a drip irrigation system to achieve precise water and fertilizer supply, directly deliver the diluted nutrient solution to the vicinity of the plant roots, reduce the migration loss of nutrients in the soil, and improve the fertilizer utilization rate; combine with foliar spraying technology, directly spray the diluted nutrient solution on the leaf surface, which can bypass the limitation of root absorption and directly provide the urgently needed nutrients for the plant. This method is especially suitable for use when the root absorption function is limited, such as under drought or low temperature conditions; foliar spraying can evenly distribute nutrients on the entire leaf surface, ensure that each leaf can obtain sufficient nutrient supply, and thus improve the overall photosynthetic efficiency and growth rate; the rich nutrient components in the nutrient solution not only promote the growth of Poa annua, but also improve its nutritional value. For example, the increased protein content makes the forage more suitable as livestock feed to meet the animal's demand for high-quality protein; by precisely adjusting the proportion of various mineral elements in the nutrient solution, ensure the balance of various nutrient elements in Poa annua, and further improve its nutritional value and palatability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the flowchart of the fertilization method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Example 1

[0034] Refer to Figure 1 , a cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions includes:

[0035] Nitrogen element. Nitrogen is a key element in the composition of important substances such as proteins, nucleic acids, and chlorophyll in Poa annua plants. In alpine regions, due to the relatively low temperature, the growth and metabolism of Poa annua are relatively slow. An appropriate supply of nitrogen can promote the growth and development of plants, enhance photosynthesis, provide sufficient energy and material basis for plants, and thus improve their cold resistance. For example, urea is a common nitrogen fertilizer with a high nitrogen content that can be quickly absorbed and utilized by Poa annua, making the leaves grow strong and have a dark green color. According to different growth stages and soil fertility conditions, the concentration of nitrogen can vary. Generally, at the initial stage of vegetative growth, the nitrogen concentration can be controlled at 5 - 8 g / L, and as the growth process progresses, it can be gradually adjusted to 3 - 6 g / L;

[0036] Phosphorus element. Phosphorus participates in important physiological processes such as energy metabolism, cell division, and root development of Poa annua. In the alpine environment, sufficient phosphorus helps the growth and development of Poa annua roots, making the roots more developed, enhancing the plant's ability to absorb nutrients and water, and thus improving cold resistance and stress resistance. Potassium dihydrogen phosphate is a commonly used phosphorus source. It not only provides phosphorus but also contains potassium, which has multiple promoting effects on the growth of Poa annua. In the nutrient solution, the phosphorus concentration should be maintained at 2 - 4 g / L. During the seedling stage and the regreening stage, appropriately increasing the phosphorus content can promote root growth and the recovery growth after winter;

[0037] Potassium element. The potassium element plays an important role in the physiological regulation of Poa annua. It can regulate the opening and closing of plant stomata, reduce water evaporation, enhance the osmotic pressure of cells, improve the water retention capacity and cold resistance of plants. At the same time, potassium can also promote the transport of photosynthetic products and the metabolism of carbohydrates, making the stems of Poa annua thick and enhancing its lodging resistance. Potassium sulfate is a commonly used potassium fertilizer, and the sulfur element it contains is also essential for the growth of Poa annua. During the entire growth cycle, the potassium concentration can be maintained at 3 - 6 g / L. During periods of severe drought or low-temperature stress, appropriately increasing the potassium content helps Poa annua cope with the harsh environment;

[0038] Iron. Iron is an essential trace element in the chlorophyll synthesis process of Poa annua. In alpine regions, due to the low availability of iron in the soil, Poa annua is prone to iron deficiency chlorosis, which affects photosynthesis and growth. By adding an appropriate iron source, such as chelated iron (EDTA - Fe), the chlorophyll content in the leaves can be increased, photosynthesis can be enhanced, and plant growth and cold resistance can be promoted. The iron concentration in the nutrient solution is generally 0.1 - 0.3 g / L. When using chelated iron, attention should be paid to its stability to avoid chemical reactions with other substances and reducing its effectiveness;

[0039] Manganese, which participates in the photosynthesis, respiration, and nitrate reduction processes of bluegrass. An appropriate amount of manganese helps improve the photosynthetic efficiency of bluegrass, enhance the antioxidant capacity of the plant, protect cell membranes from low-temperature damage. Manganese sulfate is a commonly used manganese source, which can provide absorbable manganese elements for bluegrass. The concentration of manganese in the nutrient solution should be controlled at 0.05 - 0.2 g / L. In acidic soils, the availability of manganese is relatively high; while in alkaline soils, manganese is easily fixed, and the application rate of manganese needs to be appropriately increased.

[0040] Zinc, which is a component and activator of various enzymes in bluegrass and plays an important role in the synthesis of plant growth hormones, protein metabolism, and membrane structure stability. In alpine environments, zinc can improve the stress resistance of bluegrass, promote root growth and development. Zinc sulfate is a common zinc source, and its zinc ions are easily absorbed and utilized by bluegrass; the concentration of zinc in the nutrient solution is generally 0.05 - 0.15 g / L. During the planting process, it can be appropriately adjusted according to the growth performance of bluegrass and the zinc content in the soil.

[0041] Copper, which participates in the respiration, photosynthesis, and activity regulation of various enzymes in bluegrass. It helps improve the respiration intensity of the plant and enhance the efficiency of the photosynthetic electron transport chain, thereby improving the cold resistance and disease resistance of bluegrass. Copper sulfate is a commonly used copper source, but excessive application may cause copper poisoning, and the dosage needs to be strictly controlled; the concentration of copper in the nutrient solution should be controlled at 0.02 - 0.08 g / L. During the preparation and use process, attention should be paid to the compatibility of copper fertilizers with other substances to avoid precipitation or complexation reactions.

[0042] Boron, which is of great significance to the reproductive growth and photosynthesis of bluegrass. It can promote pollen germination, fertilization process, and the formation and development of seeds. In alpine regions, boron can also enhance the stability of the cell wall of bluegrass, improve the cold resistance and stress resistance of the plant. Borax is a commonly used boron source, and its boron element is easily absorbed by bluegrass. The concentration of boron in the nutrient solution generally remains at 0.02 - 0.06 g / L. During the flower bud differentiation period and flowering period, appropriately increasing the supply of boron helps improve the seed setting rate of bluegrass.

[0043] Glycine, which is a simple amino acid. It has the functions of regulating plant growth and development and enhancing plant stress resistance. In alpine regions, glycine can act as an osmotic adjustment substance to reduce the water potential in bluegrass cells, prevent cell dehydration, and improve the cold tolerance of the plant. At the same time, glycine can also participate in the nitrogen metabolism process of bluegrass, promoting nitrogen absorption and utilization; the concentration of glycine in the nutrient solution is generally 0.5 - 1.5 g / L. During periods with severe low-temperature stress, the dosage of glycine can be appropriately increased to enhance the cold resistance of bluegrass.

[0044] Alanine, which plays an important role in the nitrogen metabolism and energy metabolism of Poa annua. It can promote nitrogen assimilation and transport, providing an organic nitrogen source for the plant. At the same time, it can also participate in the tricarboxylic acid cycle to provide energy for the plant. In the alpine environment, alanine helps to improve the energy metabolism level of Poa annua, enhancing the growth vitality and cold resistance of the plant; the concentration of alanine in the nutrient solution should be controlled at 0.5 - 1.5 g / L, and better results can be achieved when used in combination with other amino acids.

[0045] Proline, which is an important osmotic adjustment substance accumulated by plants under stress conditions. In alpine regions, the content of proline in Poa annua will increase significantly to increase the osmotic pressure of cells, protect the structural integrity of cell membranes and proteins. In addition, proline can also serve as a nitrogen source and energy reserve substance, playing a role when the plant resumes growth; the concentration of proline in the nutrient solution can be adjusted according to the growth status and environmental conditions of Poa annua, generally between 0.5 - 2 g / L. When under stress such as low temperature and drought, appropriately increasing the dosage of proline helps to improve the stress resistance of Poa annua.

[0046] Seaweed extract, which is a class of natural active substances extracted from marine algae, rich in various vitamins (such as vitamin B, vitamin C, etc.), minerals (such as potassium, calcium, magnesium, etc.), amino acids, polysaccharides, and plant growth regulators (such as auxin, cytokinin, gibberellin, etc.). These components have a good promoting effect on the growth and stress resistance of Poa annua; components such as polysaccharides and vitamins in the seaweed extract can induce Poa annua to synthesize some antioxidant enzymes (such as superoxide dismutase, peroxidase, etc.), enhancing the antioxidant capacity of the plant, scavenging free radicals in the body, and reducing the damage to the plant under stress conditions such as low temperature and drought. At the same time, the seaweed extract can also regulate the osmotic pressure of the plant, enhance the water retention capacity of cells, and improve the cold resistance and drought resistance of the plant; plant growth regulators such as auxin and cytokinin in it can stimulate the division and elongation of Poa annua cells, promote root growth, stem and leaf growth, and tillering, improving the growth rate and biomass of the plant. In addition, the seaweed extract can also improve the soil structure, increase soil aeration and water retention, creating a good soil environment for the growth of Poa annua; components such as minerals and amino acids in the seaweed extract can provide certain nutrients for Poa annua, and at the same time can also promote the absorption and utilization of nutrients in the soil by the plant. For example, the potassium element in it helps to enhance the light intensity of the plant and promote the transport of photosynthesis products; amino acids can act as chelating agents, binding to metal ions in the soil to improve the effectiveness of metal ions; in the nutrient solution, the concentration of the seaweed extract is generally 1 - 3 g / L. Before use, the seaweed extract needs to be diluted to an appropriate concentration and fully mixed with other nutrient components.

[0047] Example 2

[0048] Reference Figure 1 , A method for applying a cold-resistant and growth-promoting nutrient solution for Poa pratensis in alpine regions, including:

[0049] Seed treatment stage

[0050] Soaking: Before sowing, select the Poa pratensis seeds and soak them in the prepared nutrient solution for 12 - 24 hours. During the soaking process, macronutrients such as nitrogen, phosphorus, and potassium, as well as micronutrients such as iron, manganese, and zinc in the nutrient solution can penetrate into the seeds through the seed coat, providing sufficient nutrients for seed germination. At the same time, amino acid substances and seaweed extracts can regulate the physiological metabolism process inside the seeds, activate the endosperm of the seeds, and promote early seed germination. When soaking, the temperature of the nutrient solution should be maintained at about 20 - 25°C to facilitate the seeds to absorb nutrients.

[0051] Fishing out and cleaning: After soaking, take out the seeds from the nutrient solution, rinse them with clean water, and remove the residual nutrient solution on the surface. Then, place the seeds on a moist filter paper for germination treatment. The germination temperature is controlled at 18 - 22°C, and the humidity is maintained at 60% - 70%. Spray the seeds with clean water 1 - 2 times a day to keep the filter paper moist. During the germination process, pay attention to observing the germination situation of the seeds. When most of the seeds show white tips, they can be sown.

[0052] Seedling stage management

[0053] Irrigation: After sowing, when the Poa pratensis seedlings emerge and have 2 - 3 true leaves, start irrigating with the nutrient solution. When irrigating for the first time, dilute the concentration of the nutrient solution to 1 / 500 - 1 / 1000 times to avoid burning the seedlings. After that, irrigate with the nutrient solution every 5 - 7 days, and the concentration can be gradually adjusted to 1 / 200 - 1 / 500 times. When irrigating, pour the nutrient solution evenly on the soil around the roots of the seedlings, so that the nutrient solution can fully penetrate into the soil, allowing the seedling roots to fully absorb nutrients. At the same time, pay attention to controlling the amount of irrigation water to avoid waterlogging in the soil and causing root hypoxia.

[0054] Foliar spraying: During the seedling growth period, in addition to irrigating the nutrient solution at the roots, the method of foliar spraying can also be combined to supplement nutrients. Select in the morning or afternoon on a sunny day, dilute the nutrient solution to 300 - 500 times, load it into a sprayer, and evenly spray it on the leaves of the seedlings. Foliar spraying can directly attach the nutrient solution to the leaf surface and enter the leaf interior through stomata and cutin, quickly supplementing the nutrients required by the plants. Generally, conduct foliar spraying 1 - 2 times a week, and pay attention to spraying both the front and back sides of the leaves evenly. During the spraying process, pay attention to avoiding spraying during high-temperature and strong-light periods to avoid burning the leaves.

[0055] Fertilization frequency adjustment: Adjust the fertilization frequency in a timely manner according to the growth conditions of the seedlings and environmental conditions. When the weather is sunny, the temperature is suitable, and the seedlings are growing vigorously, the number of fertilizations can be appropriately increased; while in rainy weather, low temperature, or when the seedlings are growing slowly, the number of fertilizations should be reduced. At the same time, regularly monitor the nutrient content and pH value of the soil, and adjust the formula and application rate of the nutrient solution in a timely manner according to the soil conditions. For example, when the nitrogen element content in the soil is too high, the application rate of nitrogen fertilizer can be appropriately reduced; when the soil is alkaline, some acidic substances (such as ferrous sulfate) can be added to adjust the soil pH value.

[0056] Growth period management

[0057] Combined irrigation and drip irrigation: As the Kentucky bluegrass plants grow, their nutrient requirements gradually increase. During the growth period, the nutrient solution can be applied by combining irrigation and drip irrigation. Lay drip irrigation tapes between the rows of plants, and slowly drip the diluted nutrient solution into the soil near the roots of the plants through the drip irrigation system. Drip irrigation can precisely control the application rate and application range of the nutrient solution, reducing nutrient loss and waste. At the same time, conduct flood irrigation regularly, mix the nutrient solution with water and evenly pour it on the soil around the plants to make the nutrients fully diffuse in the soil. The frequency of drip irrigation depends on the growth conditions of the plants and climatic conditions. Generally, drip irrigation is carried out every 3 - 5 days, and each drip irrigation time is 2 - 3 hours; flood irrigation is carried out every 10 - 15 days.

[0058] Fertilization amount adjustment: Reasonably adjust the fertilization amount according to the growth stage and growth status of the plants. During key growth stages such as the jointing stage and booting stage, Kentucky bluegrass has a large demand for nutrients, and the application rate of the nutrient solution should be appropriately increased. At this time, the concentration of the nutrient solution can be increased to 1 / 100 - 1 / 200 times, and the number of fertilizations can be increased. At the same time, pay attention to the proportion balance of macronutrients such as nitrogen, phosphorus, and potassium to avoid affecting the normal growth of the plants due to excessive or insufficient amounts of a certain element. For example, during the jointing stage, the supply of nitrogen element can be appropriately increased to promote the elongation and tillering of the stems; during the booting stage, increase the application rates of phosphorus and potassium elements, which is beneficial to pollen formation and grain development.

[0059] Foliar spraying supplement: During the growth period, continue to spray the nutrient solution on the leaves to supplement the plant's demand for trace elements and amino acid substances. The concentration of the nutrient solution for foliar spraying can be adjusted to 200 - 300 times, and it is sprayed once every 7 - 10 days. When choosing the time for foliar spraying, try to choose windless and cool weather conditions to improve the spraying effect. At the same time, an appropriate amount of surfactant (such as Tween - 20) can be added to the foliar spraying solution to reduce the surface tension of the liquid, so that the nutrient solution can better adhere to the leaf surface and improve the absorption efficiency.

[0060] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cold-resistant and growth-promoting nutrient solution for Poa pratensis in alpine regions, characterized in that, Composed of the following components: Nitrogen element 5 - 8 g / L, and the nitrogen element is provided by urea; Phosphorus element 2 - 4 g / L, and the phosphorus element is provided by potassium dihydrogen phosphate; Potassium element 3 - 6 g / L, and the potassium element is provided by potassium sulfate; Trace elements, including iron element with a concentration of 0.1 - 0.3 g / L, manganese element with a concentration of 0.05 - 0.2 g / L, zinc element with a concentration of 0.05 - 0.15 g / L, copper element with a concentration of 0.02 - 0.08 g / L, and boron element with a concentration of 0.02 - 0.06 g / L; Amino acid substances, including glycine with a concentration of 0.5 - 1.5 g / L, alanine with a concentration of 0.5 - 1.5 g / L, and proline with a concentration of 0.5 - 2 g / L; Seaweed extract, with a concentration of 1 - 3 g / L.

2. The cold-resistant and growth-promoting nutrient solution for Poa pratensis in alpine regions according to claim 1, wherein The pH value of the aqueous solution of the nitrogen element, phosphorus element, potassium element, trace elements, amino acid substances, and seaweed extract should be maintained at 6.0 - 7.

5.

3. A cold-resistant and growth-promoting nutrient solution for Poa pratensis in alpine regions according to claim 1, characterized in that, A plant growth regulator can also be added to the nutrient solution. The plant growth regulator is any one or a combination of two of indolebutyric acid or naphthaleneacetic acid, and its total concentration in the nutrient solution is 0.05 - 0.2 g / L.

4. A method for applying a cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions according to any one of claims 1-3, characterized in that, Including the seed treatment stage, seedling stage management, and growth stage management, specifically as follows: The seed treatment stage includes: putting Poa annua seeds into the nutrient solution and soaking them for 12 - 24 hours at a soaking temperature of 20 - 25°C, then fishing them out and rinsing them clean with water, and performing germination treatment. The germination temperature is controlled at 18 - 22°C, and the humidity is maintained at 60% - 70%; The seedling stage management includes: when the seedlings emerge and have 2 - 3 true leaves, first irrigate them with the nutrient solution diluted to 1 / 500 - 1 / 1000 times, and then irrigate them with the nutrient solution with a concentration of 1 / 200 - 1 / 500 times every 5 - 7 days. In combination with foliar spraying, dilute the nutrient solution to 300 - 500 times and evenly spray it on both the front and back sides of the leaves 1 - 2 times a week; The growth stage management includes: adopting a combination of irrigation and drip irrigation. Every 3 - 5 days, drip the diluted nutrient solution through the drip irrigation system, and each drip irrigation time is 2 - 3 hours. Conduct a flood irrigation every 10 - 15 days, mix the nutrient solution with water and evenly pour it on the soil around the plants. At the same time, adjust the fertilization amount according to the growth of the plants. Increase the application amount of the nutrient solution during the jointing stage and booting stage, and increase the nutrient solution concentration to 1 / 100 - 1 / 200 times. And continue to conduct foliar spraying supplementation during the growth period. Dilute the nutrient solution to 200 - 300 times and spray it once every 7 - 10 days.

5. The application method of a cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions according to claim 4, characterized in that, During the germination process in the seed treatment stage, spray the seeds with clean water 1 - 2 times a day.

6. The application method of a cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions according to claim 4, characterized in that, In the seedling stage management, if the weather is sunny, the temperature is suitable, and the seedlings grow vigorously, appropriately increase the fertilization frequency; if it is rainy, the temperature is low, or the seedlings grow slowly, reduce the fertilization frequency.

7. The application method of a cold-resistant and growth-promoting nutrient solution for Poa pratensis in alpine regions according to claim 4, characterized in that, In the growth stage management, the drip irrigation frequency depends on the growth of the plants and the climate conditions. If the plants grow rapidly and the climate is dry, appropriately increase the drip irrigation frequency; if the plants grow slowly and the climate is humid, reduce the drip irrigation frequency.

8. The application method of a cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions according to claim 4, characterized in that, Before flood irrigation, stop drip irrigation for 1 - 2 days first. When spraying on the leaf surface, add surfactant Tween - 20, and its concentration in the leaf surface spraying solution is 0.1% - 0.3%.

9. The cold-resistant and growth-promoting nutrient solution for Poa annua in alpine regions or its application method according to any one of claims 1-9, characterized in that, Regularly monitor the soil nutrient content and pH value during the whole growth period, and adjust the nutrient solution formula and fertilization amount in a timely manner according to the monitoring results.

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