棉 花 学 报     Cotton Science   2006，18(5)：273-278

Effect of Different Nitrogen Fertilization on Yield and Nitrogen Using of Super High-density Cotton System
HOU Xiu-ling^1，2，ZHANG Yan^1*，WANG Xiao-jing^1，2，LI Pan¹，SHENG Jian-dong²
(1.Soil and Fertilizer Institute，Xinjiang Agriculture Academy of Sciences，Urumqi 830000，China；2. College of Resources and Environment，Xinjiang Agricultural University，Urumqi 830052，China)

Abstract：The field experiment was arranged in Awati，the south of Xinjiang. Field fertilizer experiment with one factors，four levels of design of random section was carried out in 2004. Using CCRI 35 as material the effect of different nitrogen fertilizer on yield，nitrogen absorbing and nitrogen fertilizer using efficiency of super high-density culture. The result showed that：under different nitrogen fertilizer conditions，the fertilizer response function was y＝-0.0037x²+2.6751x+1961.7（R²＝0.8324^**，n＝24），the ratio of N-fertilizer in the highest lint yield was 361.5 kg·hm^-2，and the highest yield was 2445.2 kg·hm^-2；The economic ratio of N-fertilizer was 318.2 kg·hm^-2，and the economic yield was 2438.3 kg·hm^-2. Nitrogen content in the leaves，stem，boll shells and textile fiber of cotton dropped with the period of growth stage，while the cotton seed didn't change remarkably. In the bud stage，the nitrogen concentration of the leaes and stem was regressive with the N rates applied ， while positive linear between N rates applied and leaves，stem and boll shells in boll stage and harvest. The nitrogen concentration of the seed was negative linear correlative with the N rates applied. The result indicated that the model of different fertilization would influence the relationship between the nitrogen concentration of cotton organ and N applied .At the same time ， we concluded that- the basal nitrogen 64.5 kg·hm^-2 was enough to supply the nutrient demand of cotton before flowering period. Total N-fertilizer of 245 kg·hm^-2 could obtain the lint cotton yield of above 2400 kg·hm^-2. 30 kg·hm^-2 of the basal nitrogen rate was appropriate. It says that coherence of nitrogen mode was considered at simulated equation of nitrogen rates. Nitrogen using efficiency was reduced at the increasing of nitrogen fertilizer ，and the soil supporting nitrogen ability didn't change. The economic amount of nitrogen of 240~318 kg · hm^-2 was suitable.
Key words：cotton；super high-density culture；nitrogen；nitrogen use efficiency   [Full Text, 2335KB]