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How should winter wheat apply base fertilizer and fertilizer?
For a winter wheat crop yielding between 400 and 500 kg/mu in the Huang-Huai-Hai Plain, it is recommended to use mutatis mutandis for 1500-3000 kg, 15-20-10 and other medium-nitrogen-phosphorus-low-potassium compound fertilizers or 15-15-15, etc. Compound fertilizer 25 to 35 kilograms, or the amount of nutrients and the ratio of urea, diammonium phosphate, potassium chloride and other fertilizers. If the straw is returned to the field, the amount of potash fertilizer can be appropriately reduced, but extra 3 to 5 kg of urea should be applied per acre. The top dressing is mainly from the stand up to the jointing stage, according to the local soil and seedlings, topdressing 15 to 20 kg of urea once or several times. For the wheat in the arid areas of northwestern China, fertilization should be combined with drought and water saving techniques to rob for sowing; the rice buckwheat and fertilization in the Yangtze River Valley should be combined with drainage resistance to flooding in the Sangou (carbody trench, Yaogou and Weigou) trenches. Phosphate fertilizers should use calcium superphosphate or calcium magnesium phosphate fertilizer, and increase the proportion of potassium fertilizer.