The correct use of fertilizer is one of the key measures for the production of pollution-free vegetables. How can fertilization ensure the high quality and high yield of vegetables? Replanting high-quality organic manure, controlling nitrogenous fertilizer, increasing potash fertilizer, balancing the use of chemical fertilizers, and promoting the application of biological fertilizers, coupled with rational farming, are effective measures to improve the quality and yield of vegetables.
Before the use of organic fertilizer, it must be nuisance-free. If it is fully decomposed at high temperature to reduce the spread of pests and diseases, it should be advocated in particular for the application of organic fertilizers after biogas conversion. Biogas residue and biogas slurry have high fertilizer efficiency and are the preferred fertilizers for pollution-free vegetables. . When using chemical fertilizer as a base fertilizer, apply the full depth application, and apply fertilizer as a small amount. Fertilizer should be applied deeply and early to extend fertilizer supply time, increase utilization, make plants grow faster and longer, and increase fertilizer efficiency. Phosphate fertilizer and organic fertilizer can be blended and used for more than 20 days. Potash fertilizer should be changed to a one-time basis for basic application and top-dressing, paying attention to topdressing phosphorus and potassium fertilizers during the picking period. Special attention should be paid to controlling the amount of nitrogen fertilizer. Each acre should be controlled within 30 kg of standard nitrogen fertilizer, and 70% to 80% should be used as a full-scale deep application (12 to 15 cm below) and 20% to 30% for seed dressing. Vegetables should not be applied ammonium nitrate, potassium nitrate and nitrate-containing compound fertilizers to reduce the accumulation of nitrate in vegetables. In winter and spring, the light is weak and it is easy to accumulate nitrates. High-fertilizer vegetable fields are rich in humus, and the nitrate content in vegetables is high, and nitrogen fertilizer should be prohibited. Fertilizers must be used in combination with organic fertilizers. The ratio of organic nitrogen to inorganic nitrogen should not be less than 1:1.
Leaf vegetables can not be foliar fertilizer, leaf spray directly with the air, ammonium ions easily become nitrate ions absorbed by the leaves, nitrate accumulation increased, affecting the quality of vegetables, and not resistant to storage and transportation. Therefore, it is best not to use foliar fertilizers for leafy vegetables.
Different types of vegetables, there are also choices for fertilization, vegetable production to overcome the habit of diazo light phosphorus, should be based on the types of vegetables and soil type formula fertilization. Spinach, Chinese cabbage, leeks, and radishes are prone to nitrate accumulation. Nitric acid fertilizers should be forbidden. Lotus leaves and chlorophylla have less nitrate accumulation and can be used in small amounts; nitrate, tomato, eggplant, pepper, and red and white radishes have higher nitrate accumulation. Light, nitric acid fertilizers can be applied, but the application should be stopped 15 days before harvest. Once harvested vegetables, in order to avoid the accumulation of nitrate in the crop body, the last topdressing of chemical fertilizers should be carried out 30 days before harvest. For fruits and vegetables that have been continuously produced, the last one fertilizer is applied 15 to 20 days before the harvest peak.
Before the use of organic fertilizer, it must be nuisance-free. If it is fully decomposed at high temperature to reduce the spread of pests and diseases, it should be advocated in particular for the application of organic fertilizers after biogas conversion. Biogas residue and biogas slurry have high fertilizer efficiency and are the preferred fertilizers for pollution-free vegetables. . When using chemical fertilizer as a base fertilizer, apply the full depth application, and apply fertilizer as a small amount. Fertilizer should be applied deeply and early to extend fertilizer supply time, increase utilization, make plants grow faster and longer, and increase fertilizer efficiency. Phosphate fertilizer and organic fertilizer can be blended and used for more than 20 days. Potash fertilizer should be changed to a one-time basis for basic application and top-dressing, paying attention to topdressing phosphorus and potassium fertilizers during the picking period. Special attention should be paid to controlling the amount of nitrogen fertilizer. Each acre should be controlled within 30 kg of standard nitrogen fertilizer, and 70% to 80% should be used as a full-scale deep application (12 to 15 cm below) and 20% to 30% for seed dressing. Vegetables should not be applied ammonium nitrate, potassium nitrate and nitrate-containing compound fertilizers to reduce the accumulation of nitrate in vegetables. In winter and spring, the light is weak and it is easy to accumulate nitrates. High-fertilizer vegetable fields are rich in humus, and the nitrate content in vegetables is high, and nitrogen fertilizer should be prohibited. Fertilizers must be used in combination with organic fertilizers. The ratio of organic nitrogen to inorganic nitrogen should not be less than 1:1.
Leaf vegetables can not be foliar fertilizer, leaf spray directly with the air, ammonium ions easily become nitrate ions absorbed by the leaves, nitrate accumulation increased, affecting the quality of vegetables, and not resistant to storage and transportation. Therefore, it is best not to use foliar fertilizers for leafy vegetables.
Different types of vegetables, there are also choices for fertilization, vegetable production to overcome the habit of diazo light phosphorus, should be based on the types of vegetables and soil type formula fertilization. Spinach, Chinese cabbage, leeks, and radishes are prone to nitrate accumulation. Nitric acid fertilizers should be forbidden. Lotus leaves and chlorophylla have less nitrate accumulation and can be used in small amounts; nitrate, tomato, eggplant, pepper, and red and white radishes have higher nitrate accumulation. Light, nitric acid fertilizers can be applied, but the application should be stopped 15 days before harvest. Once harvested vegetables, in order to avoid the accumulation of nitrate in the crop body, the last topdressing of chemical fertilizers should be carried out 30 days before harvest. For fruits and vegetables that have been continuously produced, the last one fertilizer is applied 15 to 20 days before the harvest peak.
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