Chemical fertilizer application twelve bogey

1, avoid a single application of a chemical fertilizer. The ideal method of application is to apply organic fertilizer first, and then use nitrogen, phosphorus, and potassium fertilizers as appropriate and scientifically. 2, avoid high temperature at noon for extra-root fertilization. The high temperature at noon not only causes rapid evaporation after spraying, but also the liquid fertilizer is not easily retained in the body surface of the crop and it is difficult to be quickly absorbed by the pore lenticels. 3, avoid nitrogen superficial application shallow. The nitrogen fertilizer is applied to the shallow layer of the topsoil and is easily decomposed and volatilized by the sunlight. 4, avoid excessive application of high concentrations of fertilizer. Regardless of the type of fertilizer, if the dose is too large, the root system of the crop will “suck down” and cause damage to the roots. 5, bogey with water. If potassium dihydrogen phosphate and urea are mixed and sprinkled with water, the operability of phosphorus and potassium in the soil is small, and the utilization rate of the fertilizer and water is very low, basically all stay in the topsoil. 6. Avoid ammonia and ammonium bicarbonate in greenhouses or greenhouses. Because the environment of the greenhouse is at a high temperature and in a closed state, the two kinds of fertilizers are easily volatilized under high-temperature confined conditions and can damage the plants and affect normal growth. 7, avoid "Lalang match." Irrespective of the nature of the fertilizer, it is not good to apply it in any combination. If the "ammonium nitrogen" fertilizer is mixed with alkaline fertilizers such as grass ash, lime, and phosphate fertilizers, it will inevitably accelerate the volatilization of nitrogen, resulting in waste of fertilizer and also easy to smoke crops. 8, avoid application or surface application of phosphorus fertilizer. Phosphorus has little mobility in the soil, and application on the surface or on the surface is particularly easy to fix by the soil and greatly reduce the fertilizer efficiency of phosphorus. 9. Avoid applying excessive nitrogen fertilizer to legume crops. The rhizobia are attached to the roots of bean-based crops. If nitrogen is used excessively, it will directly affect the nitrogen-fixing activity of Rhizobium. 10, avoid excessive application of chlorinated fertilizer to sensitive crops. Tobacco, oranges, potatoes, grapes and other sensitive crops should not be given too much chlorine at a time, otherwise it will affect the normal growth of plants. 11. Avoid fertilization before heavy rain. Because of rain or showers after fertilization, fertilizers can easily be washed out by the rain to cause loss of nutrients. 12, avoid micro-fertilizer. Zinc, molybdenum, boron, rare earth and other micro-fertilizers have a good effect on crops "deficiency syndrome", but they should not "micro-fertilizer", resulting in crop malnutrition and obstructed growth and development. China Agricultural Network Editor

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