Scientific use of Flushing Fertilizer

Greenhouse soil is generally rich in phosphorus, and the technical requirements of hedging fertilization are as follows: 1. Fertilizers should be fully soluble and generally contain no or less sub-components that will remain in the soil; 2. The content of phosphorus in fertilizer formula should be less, not more; 3. It is not easy to cause sudden concentration barrier; 4. Nitrogen has a lasting effect.

The nutrient formula of fruit and vegetable flushing fertilization, the total nutrients of nitrogen, phosphorus and potassium is 45%, and the formula of flushing fertilization is determined to be 18mur6mur21, and the formula can also be adjusted according to the specific situation. In order to prevent the concentration barrier of vegetables, potassium sulfate or potassium nitrate should be chosen as the potassium source in flushing fertilization and potassium chloride should not be used as far as possible. Among them, ammonium chloride is also used as little as possible, generally controlled within 20%, nitrate nitrogen is 10%, and other nitrogen is urea; phosphorus in flushing fertilization is provided by monoammonium phosphate.

The biases that should be prevented in the process of using flushing fertilization are as follows: 1. The use of simple urea, phosphate and potash fertilizer is easy to cause high salt concentration. Because the general compound fertilizer is not fully soluble, it often produces too much insoluble matter. The nutrient ratio of impulse fertilization is not suitable for the requirement of high nitrogen, low phosphorus and high potassium.