Diammonium phosphate should not be excessively applied to vegetables Vegetables need a lot of nitrogen and potassium, and they need 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. The diphosphoric acid nitrogen and phosphorus content ratio of about 1:3, no potassium, can not meet the needs of vegetable growth. Nitrogen fertilizers should not be applied excessively to legumes There are nitrogen-fixing rhizobia in the roots of soybeans, mung beans, broad beans, and peanuts. Too much application of nitrogen-containing compound fertilizer will not only cause waste, but also inhibit the activity of rhizobia and reduce its nitrogen fixation capacity. Rare earth fertilizer should not be applied directly to the soil and should be used as a seed fertilizer or foliar spray. Seed dressing every 25-35 grams per 667 square meters, soaking in 0.05% solution, soak for 12-24 hours and remove. Foliage spraying with a concentration of 0.05% is appropriate, with a dosage of 50-70 kg per 667 square meters, and can be mixed with pesticides. Ammonium nitrogen fertilizer should not be mixed with alkaline fertilizer Ammonium bicarbonate, ammonium sulfate, ammonium nitrate, and ammonium phosphate must not be mixed with grass ash or kiln ash. Nitrate-nitrogen fertilizers should not be applied to nitrate ions released from ammonium nitrate, sodium nitrate, etc. in paddy fields. They are easily wetted by water into deep layers of the soil in the paddy fields, resulting in denitrification and loss of nitrogen. Nitrification fertilizers applied in drylands are also forbidden. Use heavy water before or after heavy rain. Ammonium bicarbonate should not be applied lightly Depth should be more than 6 cm, immediately after application of soil, not suitable for use in the greenhouse, because ammonium bicarbonate, also known as "gas fertilizer", easily decomposed into ammonia in the greenhouse and volatile. Ammonium sulfate cannot be used for long periods of time Ammonium thiosulfate is a physiological acid fertilizer. Long-term use in a piece of land will increase the acidity of the soil and damage the structure of soil aggregates. In alkaline soils, ammonium ions in ammonium sulfate are absorbed, and acid ions remain in the soil and occur in the soil. The effect makes the soil harden. Containing chlorinated fertilizers, avoid application to saline and alkaline crops When ammonium chloride, potassium chloride and other chemical fertilizers are applied to the soil, chloride ions remain in the soil. Long-term application will increase the accumulation of chloride ions in the soil, leading to acidification of the soil. The use of salt on the saline-alkali soil will increase salt damage. The application of chlorinated fertilizers to chlorine-free crops such as sugar cane, sugar beets, potatoes, grapes, watermelons, and tobacco will greatly reduce the yield and quality. Urea should not be watered immediately after application, and it is even more inappropriate to use urea with water. After the urea is applied to the soil, it is converted to ammonium, which is easily lost with water. Therefore, water should not be applied immediately after application and should not be applied before heavy rain. Deep application of the soil can increase fertilizer efficiency by more than 20%. Phosphate fertilizer should not be dispersed Phosphorus is easily absorbed and fixed by the soil and loses its fertilizer efficiency. Many farmers' friends evenly spread calcium magnesium phosphate fertilizer in the soil. This will cause great waste. The area of ​​contact between the phosphate fertilizer and the soil should be reduced. The correct method is to use calcium first. After more than one month of storage, magnesium phosphate fertilizer and compost piles are applied or applied to the roots of crops. Potash fertilizer should not be applied at the later stage of crop growth Potassium can be transferred from the lower stems and leaves of crops to the young part of the top 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 waste should not be sprayed directly on vegetables Human feces and urine contain many kinds of pathogenic eggs. If they are not used for decomposed treatment, they will be directly used in vegetable fields, and they will contaminate vegetables, and they 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 cakes should not be directly applied to crops Cake fertilizer contains a small proportion of carbon and nitrogen, decomposition is rapid, easy to produce high temperatures, application of unripe cake fertilizer will increase the local temperature, burn the root system of the crop, or affect the germination of seeds, but also attract and breed underground pests. Therefore, the cakes should be crushed and then soaked in human excreta until it becomes warm. Unfamiliar livestock and poultry waste should not be used as fertilizer or fertilizer Because it will produce a large amount of carbon dioxide gas, so that the seeds suffocate due to lack of oxygen, but also because of its fermentation and decomposition in the soil produce a lot of heat, will accelerate the evaporation of soil moisture, is not conducive to the absorption of seed and seedlings. Protective Hood,Face Shield With Hood,Breathable Protective Hood,Surgical Hood With Face Shield Taizhou huangyan Yiman industry & trade limited , https://www.yimancoverall.com