The first is the correct choice of fertilization fertilizer types. Only water-soluble fertilizers can be applied with water. Urea, ammonia, ammonium sulfate and ammonium nitrate are commonly used for nitrogenous fertilizers; potassium chloride and potassium sulfate are commonly used for potash fertilizers, and potassium nitrate can also be used. Phosphorus fertilizers, even if they are water-soluble ammonium dihydrogen phosphate and diammonium phosphate, are not suitable for flushing. The reason is that the phosphate fertilizer has poor mobility after being dissolved, and it is easily fixed and cannot infiltrate into the root layer with water. Therefore, it is best to apply phosphate fertilizer by layering it into the soil in order to increase its utilization. The nutrients for flushing and fertilizing should be standardized. In the high-yielding cultivation of vegetables, the amount of pure nitrogen should be controlled at 2 to 4 kg per mu, especially nitrated nitrogen should be controlled at 2 to 3 kg per mu, with a limited number of times. The amount of potassium (potassium oxide) is generally 2-4 kg per mu. Otherwise, the waste and loss of nutrients will be large, which will not only reduce the utilization of fertilizers, but also cause pollution to water quality.
Followed by the period of fertilization. Generally in the period of vigorous growth of vegetables, if the vegetables in the fruit period, after picking fruits and vegetables, cabbage in the heart of the package period.
The last is the control of irrigation volume. In the case of flood irrigation, flood irrigation is prevented; when canal irrigation, the depth of the ditch is adapted to the amount of water, so that nutrients dissolved in water are prevented from being lost with water.
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