Application of potash fertilizer in vegetables
There are many kinds of potash fertilizer, and different kinds of potash fertilizer have different application methods. Commonly used potash fertilizers include potassium chloride, potassium sulfate, potassium magnesium fertilizer and plant ash. Potassium chloride and potassium sulfate are physiologically acidic fertilizers and should be applied in combination with lime and organic fertilizer. Potassium chloride and potassium magnesium fertilizer with high chlorine content should not be applied to avoid chlorine such as potato. Potassium and magnesium fertilizer is suitable for acidic soil. Plant ash is suitable for raising vegetable seedlings, which not only provides nutrients, but also absorbs heat to increase soil surface temperature and promote early emergence of seedlings. In addition, 1% plant ash extract is used as extra-root topdressing, which also has a good effect on the control of vegetable aphids. According to the experiment, the effect of point application, furrow application and strip application is better than that of spreading. Generally, potassium is applied at the 10cm near the root system of vegetables, which can not only avoid the root system from being burned, but also help the plant to absorb potassium.
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Scientific application of potash fertilizer
Potassium is one of the three elements of fertilizer, and the demand for potassium in many vegetables is often greater than that of nitrogen and phosphorus. The potassium content of well-growing vegetables is 2.5% of its dry matter content, which is higher than that of nitrogen and phosphorus. Most vegetables absorb more potassium than nitrogen. For example, the ratio of nitrogen to potassium absorbed by cucumbers is 1: (1.5-1.7), that of pumpkins is 2.1 and that of tomatoes is 1.
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Low application rate of potash fertilizer reduces crop yield
Foliar fertilization is a fertilization method in which the diluent of chemical fertilizer or trace elements is sprayed on the leaf and absorbed by the plant through the leaf stomata, so it is also called extra-root topdressing. The advantages of extra-root topdressing are: small amount, rapid and significant fertilizer effect, fertilizer will not be fixed by the soil, not absorbed by the root system.
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