In addition to potassium chloride, potassium oxide, potassium sulfate and other chemical fertilizers, straw, peanut meal, human waste, livestock manure, turf mud, grass ash and other farmyard fertilizers, all contain different amounts of potassium. Potassium can enhance the photosynthesis of plants, the synthesis of carbohydrates, and make crop stalks strong and full of seeds. It can also improve the quality of crops. For example, the content of sweet potato starch can be increased by 0.6% to 2.1%, the crude fat content of sesame can be increased by 0.8%, and the sugar content of sugar cane can be increased by 1.1%.
Potassium fertilizer can also enhance the stress resistance of crops. After applying potassium fertilizer in rice, it can reduce 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 potassium-deficient paddy field, 0.5 kg of potassium chloride can increase the yield of rice by 2.5 to 5 kg.
The use of potassium-containing farmyard manure should pay attention to two points: first, due to late fertilizer application, early application; second, potassium in turf mud and grass ash, which is easily leached by water, and can not be drained prematurely. Use potassium chloride and potassium sulfate with higher potassium, pay attention to the application method: (1) application rate. In the soil with potassium deficiency, rice is applied with 0.7 kg of potassium chloride or 10 kg of potassium sulfate per mu, and the yield increase effect is remarkable. (2) The period of administration. Can be used as a base fertilizer, but also as a top dressing. As a base fertilizer or as a top dressing in the early stage, it is better than the late application. In the sandy field with poor fertilizer retention, the combination of base fertilizer and topdressing should be applied in stages. (3) Method of administration. When applying rice topdressing, the effect of deep application of ball fertilizer is the best, and it is generally applied in combination with farmyard manure or nitrogen and phosphorus. After the application, combined with Putian. When applied to rice fields, it should be applied after the dew or rain of the rice leaves are dried to avoid burning the leaves.
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