Rushing fertilization is a kind of fertilization method developed in recent years. It is often used in the cultivation of vegetable protection land and is a major method of topdressing. This technique is to dissolve the fertilizer in water and apply it to the cultivation ground with water. Considering that the soil in the greenhouse is generally rich in phosphorus, the technical requirements for heavier fertilization are: 1 the fertilizer should be fully soluble, generally containing no or less sub-components that will remain in the soil; 2 the phosphorus content of the fertilizer formula should be less Not more likely; 3 is not prone to sudden concentration barriers; 4 nitrogen has a sustained effect.

Fruit and vegetable nutrient formulation fertilization, N, P2O5, K2O 45% of total nutrients, according to the nutritional requirements of fruit vegetables, as determined fertilization formulations 18 - 6 - 2l, of course, depending on the circumstances of the formulation greenhouse soil may be suitably Adjustment. In short, the use of high nitrogen and potassium fertilizer should be used, otherwise it is a waste of phosphorus resources. In order to prevent the concentration of vegetables from being impaired, the potassium source in the fertilization should be potassium sulfate or potassium nitrate instead of potassium chloride. Among them, the nitrogen source is also used as little as possible. The ammonium chloride is generally controlled within 20 %, the nitrate nitrogen is 10 %, and the other nitrogen is urea. The phosphorus in the fertilization is provided by monoammonium phosphate. The designed fertilizer is conducive to the growth and development of vegetables.

In the process of using the fertilization, the deviation should be prevented: 1 use of simple urea, phosphate and potassium fertilizer, which is easy to cause obstacles with excessive salt concentration; 2 because the general compound fertilizer is not fully soluble, it tends to produce too much Insoluble matter; 3 The proportion of nutrients used for flushing is not suitable for the application of high nitrogen, low phosphorus and high potassium.

In the case of correct use of fertilization, flushing fertilization should have the following four advantages: 1 uniform fertilization, no burning of roots; 2 convenient fertilization, no damage to roots; 3 crops absorb nutrients fast, high fertilizer utilization rate; 4 is conducive to increase yield Improve product quality and increase economic returns. However, the number of times of general application should not be too large, so as to avoid the growth of vegetables. (Chen Lunshou, etc.)