ÃÞ »¨ ѧ ±¨ Cotton Science 2009£¬21(1)£º39-45
Effect on the Nutrient Absorption, Assignment and Efficiency of Different Potassium Fertilizer in Sea-island Cotton Abstract: In the sea-island cotton prolific of the south of Xinjiang, the N, P2O5 and K2O absorption of this kind of cotton varieties could be simulated by the Logistic growth function model in different rates of potassium fertilizer. Most of K2O was absorbed in 60-110 d after seedling. The K2O absorption in the first 50 d accounted for 60% of total. The N and P2O5 absorption could be increased by using potassium in certain scope. The N, P2O5 and K2O absorption accorded with a unimodal curve. The speed of K2O absorption got maximum value in 80-85 d after seedling. The speed of N absorption was significantly higher than that of P2O5and K2O. The absorption peak of P2O5is relatively gentle comparing with that of N and K2O, and effect of potassium fertilizer on the P2O5absorption was not significant. In the boll opening period, N, P2O5 and K2O in the boll increased with the potassium fertilizer in certain scope. The potassium fertilizer could influence cotton boll growth. The assignment of N was coincident with that of K2O. Effect of potassium fertilizer on assignment of P2O5 was not significant in different organs of cotton. The lint yield could be increased significantly and N, P2O5 and K2O absorption were also promoted in the sea-island cotton while using potassium fertilizer was used rationally. The excessive potassium fertilizer can reduce the use efficiency of potassium fertilizer.
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