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1, urea should not be immediately watered. The urea-soluble fertilizers are highly mobile and easily lost. After spraying urea on dry land, avoid watering immediately and do not apply it before heavy rain.
2, ammonium bicarbonate should not be applied to the soil surface. Ammonium bicarbonate has a high volatility and can easily cause burning of seedlings. Therefore, ammonium bicarbonate should not be applied, it is best to open a deep hole, cover soil after application.
3, ammonium bicarbonate should not be applied in greenhouses and greenhouses. Ammonium carbonate is known as “gas fertilizer†and is applied in greenhouses and greenhouses. It is easily decomposed into ammonia gas.
4. Do not mix ammonia nitrogen fertilizer with alkaline fertilizer. Ammonium nitrogen fertilizers such as ammonium bicarbonate, ammonium sulfate, ammonium nitrate, and ammonium phosphate encounter alkaline substances and cause nitrogen loss. Do not evaporate with alkaline fertilizers such as grass ash and kiln ash potash. And lime nitrogen mixed application.
5. Nitrate nitrogenous fertilizers should not be applied in paddy fields. Nitrate ions dissociated from ammonium nitrate, such as ammonium carbonate, are easily leached by the water into the soil and cause denitrification, resulting in loss of nitrogen.
6, ammonium sulfate should not be long-term application. Ammonium sulfate is a physiological acid fertilizer that destroys the physical structure of the soil. In long-term application in alkaline soils, the sulfate ions in the soil react with calcium and the soil becomes rigid.
7, phosphate fertilizer should not be dispersed application. Phosphorus is less mobile, easily absorbed and fixed by the soil, reducing fertilizer efficiency. When applying phosphate fertilizers, the contact area between phosphate fertilizers and soil should be reduced, and it is best to use furrows or acupuncture points and apply them to the near roots of crops.
8, potassium fertilizer should not be applied in the late crop. Potassium has the characteristics of being able to transfer from the stem and leaves of the crop to the top part of the crop and reusing it, so the potassium deficiency disease is later than the nitrogen and phosphorus. Therefore, potash should be applied in advance of crop production, or as a base fertilizer.
9, containing chlorinated fertilizer avoid long-term use alone, and avoid the use of chlorine crops. The long-term application of potassium chloride alone will increase the accumulation of chloride ions in the soil, leading to the destruction of soil acidity by the soil nutrient structure. The use of sugar crops such as sugar cane, sugar beet, watermelon and tobacco will reduce quality and quality.
10, nitrogen compound fertilizer should not be used in large quantities for legumes. There are nitrogen-fixing rhizobia near the roots of soybeans, peanuts, mung beans, broad beans, peas, alfalfa and other crops. If a large amount of nitrogen-containing compound fertilizer is used, it will not only cause waste of fertilizer, but also inhibit the activity of rhizobia and reduce its nitrogen fixation performance.
Ten Chemical Fertilizers Avoided