Method for preparing early spring Chinese cabbage seedling culture nutrient soil and spraying foliar fertilizer to culture seedlings

Abstract

The invention discloses a method for preparing nutrient soil for early spring Chinese cabbage seedling culture and spraying foliar fertilizer for seedling culture, the nutrient soil is prepared by mixing crushed dry cow dung, ammonium nitrate and ammonium phosphate compound fertilizer and humus soil according to the weight ratio of 3: 2: 3, adding water, stirring and uniformly mixing, spraying green seedlings while stirring, enabling the water content of the material to be 58-60%, composting for fermentation for 15-18 days, and then spraying foliar fertilizer to prepare the nutrient soil for early spring Chinese cabbage seedling culture. And sealing, carrying out secondary fermentation until the mixture becomes dark brown, adjusting the pH value to 6.5-6.8, and sowing. According to the method for raising seedlings by spraying leaf fertilizers, the whole seedling raising process is divided into a core breaking stage, a resettling stage, an interseedling stage and a seedling fixing stage according to the growth characteristics of bolting-resistant Chinese cabbage seedlings in spring and summer, leaf fertilizers with different components and concentrations are sprayed respectively according to the seedling raising stages, and early-spring bolting-resistant Chinese cabbage strong seedlings are cultivated. The growth vigor and stress resistance of Chinese cabbage seedlings are improved, the seedling strengthening rate of early-spring bolting-resistant Chinese cabbages is promoted to reach 99% or above, the seedling recovering time after transplanting is shortened to be within 4 days, and the method is simple, practical and easy to popularize and can promote staggered-season high-quality efficient production of spring and summer Chinese cabbages.

Description

Technical Field

[0001] The invention relates to the field of fermentation of organic matrix for early spring Chinese cabbage seedling cultivation and spraying foliar fertilizer for seedling cultivation, and in particular to a method for preparing nutrient soil for bolting-resistant Chinese cabbage seedling cultivation and spraying foliar fertilizer for seedling cultivation.

[0003] Based on the differences in altitude and climatic conditions in various parts of Guizhou Province, the unique advantages of off-season vegetable production are fully utilized to promote off-season vegetable planting. From March to June every year, cool-loving vegetables such as cabbage, kale, and radish generally bolt and bloom. At this time, bolting-resistant varieties are selected, and spring and summer cool-loving vegetables are developed according to local conditions by improving sowing and seedling raising methods. They are put on the market during the off-season of cool-loving vegetables nationwide from March to June, and Guizhou's off-season vegetables are supplied to the whole country.

[0004] The key to growing Chinese cabbage in spring and summer is to prevent premature bolting and loose bulb wrapping. Choosing varieties suitable for spring growth is the key to successful cultivation. Selecting bolting-resistant Chinese cabbage for off-season cultivation will allow it to be put on the market in the off-season of spring and summer between March and June. It is crucial to select varieties that are bolting-resistant, cold-resistant and heat-resistant, have a short growth period and strong stress resistance, as well as scientific sowing and seedling raising methods.

[0005] The production of Chinese cabbage in the staggered season of spring and summer requires a large number of high-quality Chinese cabbage seedlings every year, and organic seedling medium is crucial to the growth of Chinese cabbage seedlings. To this end, the inventor has developed early spring Chinese cabbage seedling nutrient soil based on the biological characteristics and fertilizer requirements of the bolting-resistant Chinese cabbage varieties produced in the off-season of spring and summer vegetables, which can provide the required nutrient matrix. At the same time, during the seedling period, based on the growth characteristics of the early spring bolting-resistant Chinese cabbage seedlings, a seedling method for precise spraying of foliar fertilizer has been studied and summarized. Summary of the invention

[0006] In order to solve the problem that warm-loving vegetables are not put on the market in large quantities at the turn of spring and summer, while cool-loving vegetables generally bolt and bloom, resulting in a nationwide vegetable off-season from March to June, we should take advantage of Guizhou Province's three-dimensional climate characteristics and good ecological advantages in mountainous areas, select varieties that are resistant to bolting, cold and heat, have a short growing period, and have strong stress resistance, and use scientific sowing and seedling raising methods to achieve staggered production and staggered development of cool-loving cabbage to supply the spring and summer off-season market, so as to achieve higher economic and social benefits.

[0007] The invention is realized by the following technical solutions: The present invention provides a method for preparing nutrient soil for growing early spring Chinese cabbage seedlings, comprising the following steps: (1) Cow dung pretreatment: Dry the fresh cow dung and crush it into particles with a diameter of 1-2 cm.

[0008] (2) Preparation of nutrient soil: Mix crushed cow dung residue + ammonium nitrophosphate compound fertilizer + humus soil in a weight ratio of 3:2:3 and add water. At the same time, spray Green Seedling Zhuang (organic fertilizer fermentation agent, effective live bacteria count ≥ 2 billion / g) at a dosage of 0.01%-0.02%, and control the moisture content at 50%-60%.

[0009] (3) Fermentation operation: In late February to early March, pile the prepared materials into a rectangular pile and spray the surface with green seedlings to strengthen the cover; during the pile making period, monitor and control the temperature of the fermented materials every day to not exceed 60°C and the water content to 58%-60%. After 15-18 days of fermentation, turn the pile and stir the nutrient soil, cover with black mulch and seal the pile for secondary fermentation. When the fermented organic materials turn dark brown, adjust the pH to 6.5-6.8 and take them out to be used as nutrient soil for the seedling bed of bolting-resistant Chinese cabbage seedlings.

[0010] In the above step (2), the ammonium nitrophosphate compound fertilizer is required to have a total nutrient content of ≥36%, N-P2O5-K2O (30-6-0); the green seedling fertilizer fermentation agent is a composite bacterial community rich in but not limited to thermofibrous bacteria, bacteria, filamentous fungi, yeasts, actinomycetes and a variety of natural beneficial microorganisms. The effective viable count is required to be ≥2 billion / g), the dosage is 0.02%, and the moisture is controlled at 60%.

[0011] In the above step (3), the prepared nutrient material and humus soil are mixed and piled into a long pile of 3-5 meters in length, 2.0 meters in width and 1.2-1.5 meters in height.

[0012] In order to achieve a better fermentation effect, during the fermentation process, the method for preparing the early spring Chinese cabbage seedling nutrient soil is characterized in that during the fermentation process, the temperature and moisture of the fermentation material are monitored and regulated every day to ensure that the temperature of the material reaches 50-60°C and the moisture content reaches 58%-60% within 7 days. When the temperature exceeds 60°C, the material should be turned over immediately to cool down; when the moisture content is insufficient, water should be sprayed to keep it moist.

[0013] Preferably, during the fermentation process, after 15-18 days of fermentation, the nutrient soil material is turned and stirred, and the pile is covered with a black mulch film to seal the pile for secondary fermentation. When the fermented organic material turns dark brown, the pH is adjusted to 6.5-6.8.

[0014] Through comparative tests, the inventors have optimally determined that: crushed dry cow dung residue + ammonium nitrophosphate compound fertilizer + humus soil are mixed in a weight ratio of 3:2:3, water is added, and the mixture is stirred and evenly mixed. While stirring, Lv Miao Zhuang (organic fertilizer fermentation agent) is sprayed to make the moisture content of the material 58%-60%.

[0015] A method for raising seedlings of early spring Chinese cabbage by spraying foliar fertilizer, using the above-mentioned seedling nutrient soil to keep the soil moist after sowing. According to the growth characteristics of early spring bolting-resistant Chinese cabbage seedlings, the entire seedling raising process is divided into the heart breaking stage, the clustering stage, the thinning stage, and the seedling fixing stage, and four different foliar fertilizers are prepared using macroelements, trace elements and amino acid foliar fertilizers (amino acids ≥ 100g / L, Fe+Zn+B ≥ 20g / L) + potassium dihydrogen phosphate as main ingredients, and foliar fertilizers with different components and concentrations are sprayed respectively for each seedling raising stage.

[0016] In the above step (4), the heart breaking stage is the period from the germination of early spring Chinese cabbage seeds to the unfolding of two cotyledons and the appearance of true leaves. This stage is mainly to promote the growth of roots and stems of early spring Chinese cabbage, the unfolding of cotyledons, the emergence of true leaves, and the widening and thickening of new shoot leaves. Through comparative experiments, the inventors have selected a mist culture nutrient solution composed of spraying potassium dihydrogen phosphate water-soluble fertilizer and amino acid foliar fertilizer. The specific ratio and concentration are shown in Table 1:

[0017] In the above step (4), the clustering stage is the period from the early spring Chinese cabbage heart breaking to the leaves of the first leaf ring fully unfolding. This stage focuses on promoting the growth of the roots and stems of the early spring Chinese cabbage seedlings, the rapid growth of the leaves and the full unfolding of the leaves of the first leaf ring, that is, the preparation can promote the growth of the roots and stems of the early spring Chinese cabbage seedlings, the new shoots of the first leaf ring become wider and thicker, enhance the maturity of the leaves, improve the photosynthesis efficiency of the early spring Chinese cabbage seedlings, and at the same time increase the resistance of the plants to diseases and adversities. Spray the aerosol culture nutrient solution composed of amino acid foliar fertilizer, chelated iron, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer, the specific ratio and concentration are shown in Table 2:

[0018] In the above step (4), the thinning period is when the seedlings grow to 2-4 true leaves. This period focuses on promoting the growth of roots and stems of early spring Chinese cabbage seedlings, and the rapid widening and thickening of true leaves. That is, the formulation can promote the growth of roots and stems of early spring Chinese cabbage seedlings, the widening and thickening of true leaves, enhance the maturity of leaves, and improve the disease resistance and photosynthetic efficiency of Chinese cabbage. On the basis of spraying the aerosol nutrient solution composed of amino acid foliar fertilizer, chelated iron, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer, add slow-release nitrogen liquid fertilizer. Specific ratios and concentrations are shown in Table 3:

[0019] In the above step (4), the seedling determination period is when the early spring Chinese cabbage seedlings have 6-8 true leaves. This period focuses on promoting the growth of the roots and stems of the early spring Chinese cabbage seedlings, and the rapid widening and thickening of the true leaves. That is, the preparation can promote the growth of the roots and stems of the early spring Chinese cabbage seedlings, the widening and thickening of the true leaves, enhance the maturity of the leaves, promote the growth and development of the early spring Chinese cabbage plants, and improve the disease resistance and photosynthetic efficiency of the cabbage, and reduce the occurrence of diseases and pests. On the basis of spraying the mist culture nutrient solution composed of amino acid foliar fertilizer, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer, the seedlings are sprayed with slow-release nitrogen liquid fertilizer. The specific nutrient solution components are shown in Table 4:

[0020] The present invention has the following advantages and beneficial effects The present invention is developed for the biological characteristics and fertilizer requirement of bolting-resistant Chinese cabbage varieties produced in the off-season of spring and summer vegetables, which can enhance the growth potential and stress resistance of early spring seedlings and reduce the occurrence of diseases. The early spring bolting-resistant Chinese cabbage seedling rate reaches more than 99%, and the Chinese cabbage can grow vigorously within 12 hours after transplanting. The present invention has the functions of promoting the growth of roots and stems of early spring Chinese cabbage seedlings, promoting the widening and thickening of true leaf blades, improving the disease resistance and photosynthetic efficiency of Chinese cabbage, and reducing the occurrence of diseases and insect pests. At the same time, it solves the problem that pathogens and pests such as Escherichia coli and nematodes contained in cow dung are directly applied to farmland, resulting in the spread of diseases and insect pests. The present invention has high operational feasibility, is simple and practical, and is easy to promote. It can provide technical support for the bolting-resistant Chinese cabbage seedling cultivation in early spring in Guizhou, and promote the high-quality and efficient production of Chinese cabbage in the off-season at the turn of spring and summer. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the embodiments.

[0022] Embodiment: take the cultivation of Chinese cabbage seedlings of "Gui Chi Za No. 2" as an example to illustrate.

[0023] "Gui Chi Za No. 2" Chinese cabbage is a variety bred by Guiyang Jinqian Agricultural Technology Co., Ltd. that is resistant to bolting, low temperature and high temperature. It is suitable for cultivation in early spring and at the turn of spring and summer in areas of Guizhou at an altitude of 1,200 meters.

[0024] (1) Cow dung pretreatment: Dry the fresh cow dung and crush it into particles with a diameter of 1-2 cm.

[0025] (2) Preparation of nutrient soil: Mix crushed cow dung residue + ammonium nitrophosphate compound fertilizer + humus soil in a weight ratio of 3:2:3 and add water. At the same time, spray Green Seedling Zhuang (organic fertilizer fermentation agent, effective live bacteria count ≥ 2 billion / g) at a dosage of 0.02%. Control the moisture content at 60%.

[0026] Among them, ammonium nitrophosphate compound fertilizer requires total nutrients ≥36%, N-P2O5-K2O (30-6-0); Green seedling fertilizer fermentation agent is a complex bacterial community composed of a variety of natural beneficial microorganisms rich in but not limited to thermophilic cellulosic bacteria, bacteria, filamentous fungi, yeasts, and actinomycetes. The effective live bacteria count is required to be ≥2 billion / g), the dosage is 0.02%, and the moisture is controlled at 60%.

[0027] (3) Fermentation operation: From February 20 to March 10, mix the crushed dry cow dung residue + ammonium nitrophosphate compound fertilizer + humus soil in a weight ratio of 3:2:3, add water and stir to mix evenly, and spray Green Seedling Zhuang (organic fertilizer fermentation agent) while stirring to make the material water content 58%-60%. Then mix the prepared nutrient materials and humus soil and pile them into a long pile of 3-5 meters long, 2.0 meters wide and 1.2-1.5 meters high. Spray Green Seedling Zhuang on the pile surface; during the pile making period, monitor and control the temperature of the fermented materials every day to not exceed 60℃ and the water content of 58%-60%. After 15-18 days of fermentation, turn the pile and stir the nutrient soil materials, cover with black mulch and seal the pile for secondary fermentation. When the fermented organic materials turn dark brown, adjust the pH to 6.5-6.8 and take them out to be used as nutrient soil for the seedling bed of bolting-resistant Chinese cabbage seedlings.

[0028] In order to achieve a better fermentation effect, during the fermentation process, the method for preparing the early spring Chinese cabbage seedling nutrient soil is characterized in that during the fermentation process, the temperature and moisture of the fermentation material are monitored and regulated every day to ensure that the temperature of the material reaches 50-60°C and the moisture content reaches 58%-60% within 7 days. When the temperature exceeds 60°C, the material should be turned over immediately to cool down; when the moisture content is insufficient, water should be sprayed to keep it moist.

[0029] During the fermentation process, after 15-18 days of fermentation, the pile is turned and stirred with nutrient soil, covered with black mulch and sealed for secondary fermentation. When the fermented organic material turns dark brown, the pH is adjusted to 6.5-6.8.

[0030] Traditional nutrient soil: The inventor also used "decomposed farmyard manure + humus soil" as nutrient soil for Chinese cabbage seedlings for comparison: untreated human feces, livestock manure and crop straw were piled up, and natural fermentation or addition of fermentation agents were used to make it suitable for plant absorption and utilization through fermentation, 4-5 times of turning, and full decomposition. Among them: livestock and poultry manure: straw: humus soil = 3:3:4.

[0031] During the seedling raising period, keep the soil moist after sowing. According to the growth characteristics of early spring bolting-resistant Chinese cabbage seedlings, the entire seedling raising process is divided into the heart breaking stage, the clustering stage, the thinning stage, and the fixed seedling stage. Four different foliar fertilizers are prepared using macroelements, trace elements, and amino acid foliar fertilizers (amino acids ≥ 100g / L, Fe+Zn+B ≥ 20g / L) + potassium dihydrogen phosphate as the main ingredients. Foliar fertilizers with different compositions and concentrations are sprayed for each seedling raising stage.

[0032] (1) Measures for seedling raising by spraying foliar fertilizer at the heart breaking stage The heart-breaking stage is the period from the germination of early spring Chinese cabbage seeds to the unfolding of two cotyledons and the appearance of true leaves. This stage is mainly to promote the growth of roots and stems of early spring Chinese cabbage, the unfolding of cotyledons, the emergence of true leaves, and the widening and thickening of new shoot leaves. Through comparative experiments, the inventors have selected the aeroponic nutrient solution composed of potassium dihydrogen phosphate water-soluble fertilizer and amino acid foliar fertilizer, which is sprayed every 2 days at a concentration of 1‰ and 15g / 667㎡. The specific ratios and concentrations are shown in Table 1.

[0033] (2) Measures for spraying foliar fertilizer during the clustering stage to raise seedlings The clustering stage is when the leaves of the early spring Chinese cabbage from the broken heart to the first leaf ring are fully unfolded. This stage focuses on promoting the growth of the roots and stems of the early spring Chinese cabbage seedlings, the rapid growth of the leaves, and the full unfolding of the leaves of the first leaf ring. That is, the formulation can promote the growth of the roots and stems of the early spring Chinese cabbage seedlings, the new shoots of the first leaf ring become wider and thicker, enhance the maturity of the leaves, improve the photosynthesis efficiency of the early spring Chinese cabbage seedlings, and at the same time increase the resistance of the plants to diseases and adversity. Spray the mist culture nutrient solution composed of amino acid foliar fertilizer, chelated iron, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer, according to 15g / 667㎡, concentration 1.5‰, spray once every 2 days. See Table 2 for specific ratios and concentrations.

[0034] (3) Measures for spraying foliar fertilizer during the thinning period The thinning period is when the seedlings grow to 2-4 true leaves. The focus of this period is to promote the growth of roots and stems of early spring Chinese cabbage seedlings, and the rapid widening and thickening of true leaves. That is, the formulation can promote the growth of roots and stems of early spring Chinese cabbage seedlings, the widening and thickening of true leaves, enhance the maturity of leaves, and improve the disease resistance and photosynthetic efficiency of Chinese cabbage. On the basis of spraying the mist culture nutrient solution composed of amino acid foliar fertilizer, chelated iron, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer, add slow-release nitrogen liquid fertilizer. According to 20 / 667㎡, concentration of 2‰, spray once every 3 days. See Table 3 for specific ratios and concentrations.

[0035] (4) Measures for spraying foliar fertilizer during the seedling stage Seedling period: When the early spring Chinese cabbage seedlings have 6-8 true leaves. This period focuses on promoting the growth of roots and stems of early spring Chinese cabbage seedlings, and the rapid widening and thickening of true leaves. That is, the formulation can promote the growth of roots and stems of early spring Chinese cabbage seedlings, the widening and thickening of true leaves, enhance the maturity of leaves, promote the growth and development of early spring Chinese cabbage plants, and improve the disease resistance and photosynthetic efficiency of Chinese cabbage, and reduce the occurrence of diseases and pests. On the basis of spraying the mist culture nutrient solution composed of amino acid foliar fertilizer, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer, the seedlings are sprayed with slow-release nitrogen liquid fertilizer. According to 20g / 667㎡, the concentration is 2.5‰, and it is sprayed every 3 days. The specific nutrient solution components are shown in Table 4.

[0036] (5) Seedling cultivation effect

[0037] By comparison, the root vitality, net photosynthetic rate and strong seedling rate of Chinese cabbage seedlings using the nutrient soil of the present invention combined with the measures of spraying foliar fertilizer for seedling cultivation are much higher than those using the method of fermenting nutrient soil with decomposed farmyard manure + humus soil and spraying clean water throughout the process for seedling cultivation. The seedling acclimatization time only needs 4 days. The measures of the nutrient soil of the present invention combined with the measures of spraying foliar fertilizer for seedling cultivation can not only provide a good rhizosphere environment and nutrient conditions for the growth of Chinese cabbage seedlings, but also ensure the vigorous growth of Chinese cabbage seedlings, and cultivate strong Chinese cabbage seedlings that are resistant to low temperature and bolting.

[0038] (6) Comparison of disease incidence during seedling raising period

[0039] By comparison, it can be seen that the incidence of various diseases in the method of raising seedlings by combining the nutrient soil of the present invention with spraying foliar fertilizer is much lower than that in the method of raising seedlings by spraying clean water during the whole process of nutrient soil made by fermenting decomposed farmyard manure + humus soil. It can ensure the vigorous growth of Chinese cabbage seedlings, improve the disease resistance of Chinese cabbage, make it less susceptible to diseases, and cultivate strong Chinese cabbage seedlings that are resistant to low temperature and bolting.

Claims

1. A method for preparing nutrient soil for growing Chinese cabbage seedlings in early spring, characterized in that The steps include: (1) Cow dung pretreatment: Dry the fresh cow dung and crush it into small pieces with a diameter of 1-2 cm; (2) Preparation of nutrient soil: Mix crushed cow dung residue + ammonium nitrophosphate compound fertilizer + humus soil in a weight ratio of 3:2:3 and add water. At the same time, spray Green Seedling Strong at a dosage of 0.01%-0.02%, and control the moisture content at 50%-60%; (3) Fermentation operation: In late February to early March, the prepared materials are piled into rectangular piles, and the surface of the piles is sprayed with green seedlings to strengthen the cover; during the pile making period, the temperature of the fermented materials is monitored and controlled every day to not exceed 60°C, and the temperature of the materials is ensured to reach 50-60°C within 7 days; the water content is 58%-60%; After 15-18 days of fermentation, turn the pile and stir the nutrient soil, cover with black mulch and seal it for secondary fermentation. When the fermented organic material turns dark brown, adjust the pH to 6.5-6.8, take it out and use it as nutrient soil for the early spring bolting-resistant Chinese cabbage seedling bed, and sow it.

2. The method for preparing nutrient soil for growing early spring Chinese cabbage seedlings as claimed in claim 1, characterized in that In step (2), the total nutrient content of the ammonium nitrophosphate compound fertilizer is ≥36%, N-P2O5-K2O (30-6-0), the amount of green seedling fertilizer is 0.02%, and the moisture content is controlled at 60%; the humus soil is the topsoil rich in humus in the top 5-10 cm of pine forest or bamboo forest.

3. The method for preparing nutrient soil for growing early spring Chinese cabbage seedlings as claimed in claim 1, characterized in that In step (3), the rectangular pile is a long pile with a length of 3-5 meters, a width of 2.0 meters, and a height of 1.2-1.5 meters.

4. The method for preparing nutrient soil for growing early spring Chinese cabbage seedlings as claimed in claim 1, characterized in that when the fermented organic material turns dark brown, the pH of the fermented material is monitored and citric acid is added to adjust the pH of the fermented material so that the pH of the nutrient soil is between 6.5 and 6.

8.

5. A method for raising seedlings of early spring Chinese cabbage by spraying foliar fertilizer, characterized in that: The seedling raising nutrient soil prepared by the preparation method according to claim 1 is used for sowing. During the seedling raising period, according to the growth characteristics of early spring bolting-resistant Chinese cabbage seedlings, the entire seedling raising process is divided into: (1) Heart breaking stage: from seed germination to the unfolding of two cotyledons and the appearance of true leaves; (2) Cluster stage: All leaves from the heart to the first leaf ring are fully unfolded; (3) Thinning period: When the seedlings grow to 2-4 true leaves, apply nitrogen fertilizer to the weaker seedlings after watering; (4) Seedling stage: 6-8 true leaves grow; Four different foliar fertilizers are prepared using macroelements, trace elements and amino acid foliar fertilizer + potassium dihydrogen phosphate as the main ingredients. Foliar fertilizers with different compositions and concentrations are sprayed at each seedling stage.

6. The method for raising seedlings of early spring Chinese cabbage by spraying foliar fertilizer as claimed in claim 5, characterized in that: The foliar fertilizer sprayed during the heartbreaking stage consists of potassium dihydrogen phosphate water-soluble fertilizer and magnesium sulfate; the foliar fertilizer sprayed during the clumping stage consists of potassium dihydrogen phosphate water-soluble fertilizer, magnesium sulfate and amino acid foliar fertilizer; the foliar fertilizer sprayed during the thinning stage consists of potassium dihydrogen phosphate water-soluble fertilizer, magnesium sulfate, amino acid foliar fertilizer and slow-release nitrogen liquid fertilizer; the foliar fertilizer sprayed during the seedling establishment stage consists of potassium dihydrogen phosphate water-soluble fertilizer, amino acid foliar fertilizer, slow-release nitrogen liquid fertilizer and nutrient solution of major elements and trace elements.

7. The method for raising seedlings of early spring Chinese cabbage by spraying foliar fertilizer as claimed in claim 5, characterized in that: During the heart-breaking period, spray the aeroponic nutrient solution consisting of potassium dihydrogen phosphate water-soluble fertilizer and amino acid foliar fertilizer. The specific ratio and concentration are shown in Table 1:

8. The method for raising seedlings of early spring Chinese cabbage by spraying foliar fertilizer as claimed in claim 5, characterized in that During the planting period, spray the aeroponic nutrient solution consisting of amino acid foliar fertilizer, chelated iron, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer. The specific ratio and concentration are shown in Table 2:

9. The method for raising seedlings of early spring Chinese cabbage by spraying foliar fertilizer as claimed in claim 5, characterized in that In the seedling stage, spray the aeroponic nutrient solution composed of amino acid foliar fertilizer, chelated iron, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer, and add slow-release nitrogen liquid fertilizer. The specific ratio and concentration are shown in Table 3:

10. The method for raising seedlings of early spring Chinese cabbage by spraying foliar fertilizer as claimed in claim 5, characterized in that: Seedling stage: In addition to spraying the aeroponic nutrient solution composed of amino acid foliar fertilizer, magnesium sulfate and potassium dihydrogen phosphate water-soluble fertilizer, the seedlings are sprayed with slow-release nitrogen liquid fertilizer. The specific nutrient solution components are shown in Table 4:

Images