Effects of Different Dustfall Level on Charactertics of Nutrition in Cotton

MO Zhixin; WEN Shanju

Abstract：Simulation study on the influence of dust fall on cotton nutrition properties in greenhouse was done,aiming to determine the nutritional effect of dust fall on cotton, and provide the basis for cotton rational fertilization and management in dust fall zone. The results showed that:the nitrogen content of cotton in the early bud stage to boll stage by the dust effect was higher than that without dust effect,while in the cotton boll opening stage, its nitrogen content reached the maximum by 0. 5 times the natural dustfall effect. The phosphorus content of cotton at different growth stages suffering the dust effect was higher than that not suffering the dust effect, from the early bud stage to the boll stage the cotton phosphorus content reached the maximum by 0. 5 times natural dustfall influence,and in the boll opening stage it reached the maximum under 2 times the amount of natural dustfall effect. The potassium content of cotton decreased by the dustfall effect in different growth periods. The results above indicated that dust fall affected the cotton quality,and the effect in different growth period was different. In the early bud stage, bud stage, flowering stage, and ball stage the nitrogen fertilizer application amount could be reduced correspondingly according to the nitrogen content in the dust,but in the boll opening stage,the nitrogen fertilizer application amount should be increased. Cotton P fertilization amount should be reduced appropriately according to the content of phosphorus in the dust, achieving the purpose of saving fertilizer and increasing yield. The decline of K content directly affected the quality of cotton fiber and rational application of K fertilizer must be noticed in cotton areas of the Tarim Basin.