Rational application of potash fertilizer
In addition to chemical fertilizers such as potassium chloride, potassium oxide and potassium sulfate, farm fertilizers such as straw, peanut seedlings, human feces and urine, livestock and poultry manure, turf mud and plant ash all contain different amounts of potassium. Potassium can enhance plant photosynthesis, carbohydrate synthesis, so that crop stalks strong, full grains. It can also improve the quality of crops. For example, the starch content of sweet potato can be increased by 0.6%-2.1%, the crude fat content of sesame can be increased by 0.8%, and the sugar content of sugarcane can be increased by 1.1%. Potash fertilizer can also enhance the stress resistance of crops. The application of potassium fertilizer to rice can reduce flax leaf spot, red blight, sheath blight and rice blast. It can also improve the cold resistance, drought resistance and lodging resistance of rice. Therefore, in the paddy field with potassium deficiency, 0.5 kg potassium chloride can increase the yield of rice by 2.5 kg. When using farm manure containing potassium, we should pay attention to two points: first, because the fertilizer effect is late, it should be applied early; second, the potassium in turf mud and plant ash is easy to be leached by water, and the paddy field can not be drained prematurely. When using potassium chloride and potassium sulfate with higher potassium content, we should pay attention to the application method: (1) application amount. In potassium deficient soil, the yield was significantly increased by applying 0.7 kg of potassium chloride or 10 kg of potassium sulfate per mu. (2) the period of application. It can be used as base fertilizer or topdressing fertilizer. The yield increasing effect of basal fertilizer or early topdressing is better than that of late application. In sandy fields with poor fertilizer conservation, base fertilizer and topdressing should be combined and applied in stages. (3) Application method. When topdressing rice, the effect of deep application of ball fertilizer is the best, which is generally combined with farm manure or nitrogen and phosphorus. Combine the field with the field after giving. When spreading in the paddy field, it should be applied in the dew of rice leaves or after Rain Water is dry, so as to avoid burning leaves.
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Five points should be paid attention to in the efficient and scientific application of potash fertilizer
Master Chang, a vegetable farmer, has changed to grow tomatoes in the past two years, and his output and benefits have been good. The reason is that he pays more attention to soil testing and fertilization. Last year, his greenhouse soil organic matter reached 27.25g/kg, because the soil organic matter content is high, this spring did not use organic fertilizer, but according to 40 kg compound fertilizer per mu, 7.
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