Fertilizer to vegetable fields should pay attention to the following points:
1. Application of Ammonium Nitrate Green leafy vegetables such as Chinese cabbage, Chinese cabbage, celery, spinach, etc., have a short growing period and are easily absorbed by nitrate nitrogen fertilizer, which can lead to excessive levels of nitrate in vegetables. Therefore, green leafy vegetables should not be applied ammonium nitrate.
2. The spraying of pure nitrogen fertilizer on green leafy vegetables should not be used to spray nitrogenous fertilizer such as urea or ammonium sulfate, nor should it be sprayed with human urine. Urea, ammonium sulphate or human urine are sprayed on the foliage, and the nitrate content will increase significantly, affecting human health.
3. Urea cannot be watered immediately after applying urea Urea can be converted to ammonium carbonate or ammonium bicarbonate only when it is absorbed by vegetable roots, or can be stored by soil adsorption. Immediately after the urea is applied, it will be filled with water or rain, and the amide nitrogen will be lost along with the water, causing loss of nitrogen nutrients. Generally applying urea for 5-7 days before irrigating can avoid unnecessary nitrogen loss.
4. Do not apply too much phosphorus fertilizer to vegetable fields. If you use a large amount of phosphate fertilizer for a long period of time, excessive supply of phosphate fertilizer, especially if the application amount of mu exceeds 40 kg, will cause serious harm, which will seriously affect the growth and development of vegetables, cause premature aging of vegetables, and poor growth. , The output is reduced and the quality is deteriorated. General Mushi 15-20 kg is appropriate. In order to avoid excessive fertilization, we can also choose to use biological fertilizers such as gold and microbial microbial fertilizer, use this product can reduce the amount of fertilizer about 30%, improve the utilization of fertilizer to reduce costs, generally Mushi 1 to 2 kg.
5. Green leafy vegetables should not be used to produce human excrement from manure, especially in hospitals, stations, docks, restaurants, and public toilets, containing a variety of infectious bacteria and parasite eggs. If such manure is directly applied to green leafy vegetables without being tampered with or treated, the vegetables will be seriously polluted and even cause the spread of various infectious diseases and parasitic diseases. The use of this manure can be fermented with a goldfish starter. Fermentation of the fertilizer can not only avoid these drawbacks, make the manure fully mature, but also reduce environmental pollution.
6. The livestock and poultry manure should be used for pigs and cattle after the stacking. The feedstuffs are selected from crop straws and weeds. The straws and weeds are mixed with a lot of weed seeds. The weed seeds in manure manure are very strong. The fecal ring fertilizers are brought into the vegetable field and can still germinate, causing great harm to the vegetables. Sputum fertilizer should be taken out of the ring, after high-temperature stacking, to kill weed seeds and parasite eggs, pathogenic bacteria in livestock manure. Generally, natural heaping can be applied for about 2 months. If a biological fermenting agent is used to treat, for example, a golden babe fertilizer starter, it can be fully cooked within a few days.
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