Diammonium phosphate should not be excessively applied to vegetables and vegetables. It requires a large amount of nitrogen and potassium and requires less phosphorus. For example, the ratio of nitrogen, phosphorus, and potassium required for eggplant is 3:1:4, celery is 2:1:5, and cabbage is 8:1:7. While the ratio of nitrogen to phosphorus of diammonium phosphate is about 1:3, no potassium can not meet the demand for vegetable growth.
The nitrogen-containing compound fertilizer should not be applied to the roots of leguminous soybeans, mungbeans, broad beans, and peanuts with nitrogen-fixing rhizobia. Excessive application of nitrogen-containing compound fertilizer not only causes waste, but also inhibits the activity of rhizobia and reduces it. Nitrogen fixation capacity.
Rare earth fertilizer should not be applied directly to the soil, should be used as a seed fertilizer or foliar spray seed dressing dosage of 25 to 35 grams per acre, soaking a solution of 0.05%, soak for 12 to 24 hours to remove and sow. Foliage spraying with a concentration of 0.05% is appropriate, the amount of 50-70 kg per mu, and can be mixed with pesticides.
Ammonium nitrogen fertilizer should not be mixed with alkaline fertilizer ammonium bicarbonate, ammonium sulfate, ammonium nitrate, ammonium phosphate should not be mixed with plant ash, kiln ash. Nitrate-containing nitrogen fertilizers should not be applied to rice fields. Nitrate ions such as ammonium nitrate and sodium nitrate dissociate. They are easily wetted by water into deep layers of the soil in the paddy fields, resulting in denitrification and loss of nitrogen. Nitrate fertilizers are also applied in dryland areas. Avoid using heavy water before or after heavy rain.
Urea should not be immediately watered after application, but should not be applied to the soil with urea after application of urea into the ammonium, it is easy to loss with water, so after application should not be immediately watered, not before the heavy rain, deep application Soil can increase fertilizer efficiency by more than 20%.
Phosphorus fertilizers are not suitable for the dispersed use of phosphorus. They are easily absorbed by the soil and lose their effectiveness. Many farmers' friends evenly spread calcium, magnesium and phosphorus fertilizers in the soil. This will cause a lot of waste and should reduce the contact area between the phosphate fertilizer and the soil. The method should be to store calcium magnesium phosphate fertilizer and compost heap for about one month, and then apply or apply it to the roots of crops.
Potassium fertilizer should not be used in the later stage of crop growth. Potassium can be transferred from the lower stems and leaves of crops to the top young parts and reused. The potassium deficiency symptoms are later than the symptoms of nitrogen deficiency and phosphorus deficiency. Potash should be applied in advance before the seedling stage or jointing, or as a base fertilizer. Human fecal urine should not be sprayed directly on vegetables. Human feces and urine contains many kinds of pathogenic eggs. If it is not cooked, it will be used directly in vegetable fields and it will contaminate vegetables. It should not be used too much for fruits and potatoes. Must be subjected to high temperature stacking, or mixed with other fertilizers and stacked, and can be used after drug treatment.
Uncooked cake fat should not be directly applied to crop cakes. The fertilizer contains a small proportion of carbon and nitrogen and is rapidly degraded. It is prone to high temperatures. The application of unripe cakes will increase the local temperature, burn the roots of the crops, or affect the seed germination. , breeding ground pests. Therefore, the cakes should be crushed and then soaked in human excreta until it becomes warm.
Unfamiliar livestock and poultry excrement should not be used as fertilizer or topdressing because it will produce large amounts of carbon dioxide gas, so that the seeds will suffocate due to lack of oxygen, but also because it will produce large amounts of heat during fermentation and decomposition in the soil, which will accelerate the evaporation of soil moisture. It facilitates the absorption of seeds and seedlings.
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