1, pay attention to the application of ammonium nitrate: green leaf vegetables to prevent the application of ammonium nitrate, such as cabbage, Chinese cabbage, leeks, celery, spinach and other green leafy vegetables, short growing period, easy to absorb nitrate nitrogen fertilizer, will lead to excessive nitrate content of vegetables.

2, pay attention to pure nitrogen fertilizer spraying: green leafy vegetables should not be sprayed urea or ammonium sulfate and other nitrogen fertilizer, it should not spray human urine. Urea, ammonium sulphate or human urine are sprayed on the foliage, and the nitrate content will increase significantly, affecting human health.

3, pay attention to the application of urea can not immediately irrigation: urea can only be converted to ammonium carbonate or ammonium bicarbonate can be absorbed by vegetable roots, or soil adsorption preservation, only under the effect of urease enzyme secreted by soil microorganisms. 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. The application of urea for 5 to 7 days followed by irrigation can avoid unnecessary nitrogen loss.

4. Be careful not to apply ammonium sulfate multiple times in succession: In acidic soils or in calcareous vegetable fields, continuous application of ammonium sulfate can make acidic soils more acidic; calcareous soils cause soil compaction and impede the normal growth of vegetables. .

5. Pay attention to the shortage of water in vegetable fields. Ammonium bicarbonate is not very stable and volatile, especially in the case of drought and water shortage in vegetable fields. For the application of ammonium bicarbonate in vegetable fields, regardless of whether it is used as a base fertilizer or topdressing, deep application should be carried out under the condition of moist vegetable fields, and the soil shall be covered immediately after application.

6, pay attention to the amount of phosphate fertilizer not too many fields such as continuous application of phosphate fertilizer, excessive supply of phosphate, in particular, the case of more than 40 kilograms of the case of a large number of harmful effects, will seriously affect the growth and development of vegetables, vegetables, premature aging, growth Bad, lower production, deteriorated quality. Generally Mushi 15-20 kg is appropriate.

7. Be careful not to apply manure manure: raw manure, especially in the septic tanks of hospitals, stations, terminals, hotels and public toilets, contains a variety of infectious bacteria and parasite eggs. If the manure is directly poured into the vegetable field 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 human manure must be applied after a harmless treatment such as sealed heaping, biogas digester fermentation and drug treatment.

8. Pay attention to the use of livestock manure after stacking: Pigs, cattle, and horses use more crop straw and weeds, while straw and weeds have many weed seeds, weed seeds in livestock manure, and vitality. Very strong, with the fecal ring into the vegetable field and still able to germinate, great harm to 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 after 2 months. If the biological starter is used to treat the stack, 10-20 days can fully decompose.

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