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The principle of fertilization is based on the soil fertility conditions, and the amount of nitrogen and phosphorus fertilizers should be appropriately adjusted; organic fertilizers should be added to promote organic and inorganic coordination; based on the soil potassium status of the cotton fields, potash fertilizers should be used efficiently, and attention should be paid to the combined application of boron and zinc; Fertilizer application rate should be combined with high yield and good quality cultivation techniques.
Fertilization is recommended under the conditions of 70-90 kilograms per hectare of lint cotton. The total amount of fertilization is 2000 kilograms of high quality farmyard manure, 11 to 13 kilograms of nitrogen fertilizer, 5 to 7 kilograms of phosphate fertilizer, and 5 to 7 kilograms of potash fertilizer. For boron and zinc-deficient cotton fields, pay attention to boron and zinc fertilizer.
35% to 40% of nitrogen fertilizer is used as basal fertilizer, 35% to 40% is used in the early flowering period, 15% to 20% is used in flowering stage; Phosphorus fertilizer is all used as base fertilizer; Potash fertilizer is all used as base fertilizer or base recovery (early flowering period) half. From the flowering stage, on the weaker growing cotton fields, combine spray 0.5% ~ 1.0% urea and 0.3% ~ 0.5% potassium dihydrogen phosphate solution 50 ~ 75 kg / times, spray once every 7 ~ 10 days, Continuous spraying 2 to 3 times.
Huanghuaihai Region Cotton Fertilization Suggestion
The problem is that the amount of nitrogen-phosphorus fertilizer is generally high, organic fertilizer is insufficient, and the deficiency of trace elements such as boron and zinc occurs from time to time.