Expert Comments: The vegetable farmer listened to the advice of agricultural technicians, and applied nitrogen fertilizer to the leafy vegetable crops without paying attention to nitrogen and potassium, and applied compound fertilizer. Her desire for improved fertilization of green vegetables is good. However, the fertilization method is not compatible with the selected compound fertilizer type, and therefore, the effect is not satisfactory. The ternary compound fertilizer containing three nutrients of nitrogen, phosphorus, and potassium should be used as a basal fertilizer. Before the planting of green vegetables, it should be applied to a certain depth of soil. When the vegetables grow up, the body of the vegetable grows rapidly, and the root system ties down. Only the deep soil layer can use nitrogen, phosphorus and potassium nutrients supplied by basal fertilizer. Leafy vegetables are hi-nitro crops. In addition to basal fertilization, some nitrogen fertilizers or nitrogen and potassium fertilizers are also applied during a large number of growing seasons. This time the best nitrogen fertilizer effect, the largest impact on the yield. When topdressing nitrogenous fertilizers, the method of flushing fertilization can also be called fertigation. Because, conventional nitrogen fertilizers are all water-soluble. Nitrogen fertilization can be applied to the plant. After it is dissolved, it can move in the soil and can move with the water. Phosphorus and potassium have very little mobility, and phosphorus, in particular, hardly moves, so phosphorus is not suitable for topdressing and fertilizing. Although nitrogen fertilizer can be flushed, the amount of application should be controlled a small number of times, and topdressing nitrogen fertilizer should not be excessive. Otherwise, it will not only waste nitrogen but also pollute the environment.
Case Tip: Particle compound fertilizer should not be sprinkled on the surface and should not be fertilized, where the phosphate fertilizer is not completely dissolved, the downward mobility is poor, the root is not easy to absorb, not only low phosphate fertilizer utilization, phosphorus accumulation in the surface can also be fixed Soil surface trace elements.
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