Study On Different Execute Nitrogen Levels On Nutrient Uptake Yield And Quality Of Cotton

The experiment study on different amount nitrogen fertilizer effects plant nitrogen, phosphorus and potassium nutrient absorption, as well as explored appropriate nitrogen application rate the northern of Xinjiang, in order to improve used efficiency of nitrogen, establish technology of efficient Nitrogen in cotton, provide practical experience and scientific basis of the northern of Xinjiang.Studies have showed that dry matter accumulation of cotton were short and slow in the growth of perhaps, it increased fast in the medium-term and slowly increased in the latter. It used Logistic equation to fit dry matter accumulation of different nitrogen, the greatest moment of dry matter accumulation appeared about after 85d~94d of planting, Executed reasonable nitrogen can reasonable extended period of dry matter accumulation of the strong period, it promoted the formation of economic output of cotton. Executed reasonable nitrogen can increase the amount of nitrogen,phosphorus,and potassium uptake and promote nutrient substances that synthesized and operated in the body of cotton. in the entire reproductive process of cotton, a strong period of absorption nitrogen on the sowing period after 54d~114d, phosphorus after 57d~112d, potassium after 44d~89d.In the process, nitrogen, phosphorus and potassium of the strong period accumulation of N2 processing is the longest, respectively, up to 56d,55d,43d, than others extended 5d~17d, 2d~10d, 2d~15d, it shows that appropriate execute nitrogen promoted strong period to extend of phosphorus,potassium, it provided essential nutrients for the high-yielding cotton. Strong period of accumulation nitrogen of N2 processing in the 54d after sowing, the greatest moment of nitrogen accumulation in the 82d after sowing. Therefore, the best nitrogen topdressing in the 54d and 82d after sowing period.Plant nutrient accumulation of no or less nitrogen fertilizer are lowest, while the lower amount of nutrient accumulation is not conducive to the formation of cotton production, obtained lint yield were only 1061.31kg/hm2, 1280.59kg/hm2; it executed higher nitrogen to the cotton, the body of plant can not get higher accumulation of nutrients. the amount of the nitrogen was 300kg /hm2 can significantly improve nutrient accumulation in the planting body, so that the amount of taking up nitrogen, phosphorus and potassium was the highest, respectively 319.70kg/hm2, 189.58kg/hm2 and 213.27kg/hm2, and the highest production was 1355.40kg/hm2. Science to determine the economic nitrogen application rate was 320.46kg/hm2 in Cotton fields.Executing nitrogen improve the quality of cotton fiber, which fiber length, uniformity, strength and spin ability were increased, to a certain extent, it reduced, the fiber length and the uniformity was significantly higher between the treatments, especially N2,N5 existed more significant difference than others. Or litter effected on maturity, micron air value, short fiber index. The results showed that nitrogen increased efficient of cotton spinning. Exciting nitrogen will be improve fiber quality of cotton.The agriculture efficiency of the lowest executed nitrogen of 150kg/hm2 was 1.46kg/kg that it was highest. It enhanced economic out put. The apparent utilization and the partial productivity of moderately executed nitrogen is highest. They were 11.23%,8.54kg/kg, it enhance absorption of nitrogen. The agricultural efficiency of nitrogen, the apparent utilization and the partial productivity of farmers executed nitrogen was lowest than moderate executed nitrogen, but the a mount of nitrogen was 20.78kg/hm2 more than moderately executed nitrogen. In the aspect of profit, the lint yield of the moderately executed nitrogen of 300kg/hm2 was 185.4kg/hm2, it was more than conventional fertilization, it was more than conventional fertilization. It increased profit of 2607.63 yuan/hm2. So appropriate executed nitrogen may be reduce cost, receive a higher income.