How to apply potash fertilizer to grow vegetables

How to apply potash fertilizer to grow vegetables? We should pay attention to what potassium is one of the three elements of fertilizer. Many vegetables often need more potassium than nitrogen and phosphorus. The potassium content of well-growing vegetables is 2.5% of dry matter, which is higher than that of nitrogen and phosphorus. Most vegetables absorb more potassium than nitrogen, such as 1: (1.5-1.7) for cucumber, 1: (1.5-1.7) for pumpkin, 1: (1.9) for tomato, 1: (1.5-1.65) for eggplant, 1: 1.3 for green pepper, 1: 1.1 (1.1-1.3) for carrot, 1: (1.1-1.35) for radish and 1: (1.1-1.4) for onion. 1: (1.6-1.9) for lettuce and 1: (1.1-1.3) for cabbage. Some of the potassium applied to the soil is fixed into a form that is difficult to absorb, and some become substituted potassium that can be easily absorbed by vegetables. Only about 50% of the potassium fertilizer applied is actually absorbed by vegetables. Generally speaking, the availability of potassium in sandy soil is higher than that in clayey soil, while that in calcareous soil is lower. The most suitable potassium concentration for vegetable growth is about 5% of the total exchangeable potassium in the soil. When the content of exchangeable potassium in soil is low, such as sandy soil lower than 85mg/kg, sandy loam and loam lower than 100mg/kg, clay lower than 125mg/kg, potassium fertilizer can improve the yield and quality of vegetables. The conventional amount of potassium application is 0.8murl 1.5 times that of vegetables. Most vegetables use the same amount of nitrogen, phosphorus and potassium as base fertilizer, generally applying potassium oxide 10-15kg per 667M2, but while increasing nitrogen fertilizer, the amount of potassium fertilizer must be increased. For eggplant fruits, melons and other vegetables that need a large amount of potassium, we should also pay attention to increase the proportion of potash fertilizer, and in the case of adequate application of base fertilizer, timely and appropriate amount of potash fertilizer in the later stage. For fruits and vegetables, topdressing potash fertilizer accounts for 50% of the total amount of potassium application. 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. Click to get more nitrogen, phosphorus and potassium application techniques click to get more fertilizer application techniques click to get more vegetable planting techniques