摘要
采用物候学生物中日度累积的方法 ,研究了不同氮肥施用量对棉花各生育期所需日度的影响。研究结果表明 ,棉花各个生育期在施用 0～ 2 2 5kg/hm2 氮肥水平时 ,日度呈现增加趋势 :在 2 2 5～ 5 2 5kg/hm2 氮肥水平时 ,日度呈现减少趋势。蕾期、铃期、吐絮期均在 2 2 5kg/hm2 氮肥水平时 ,所需日度达到最大值 :5 16 .5 5 8日度、76 8.6 8日度、130 9.0 2日度 ,分别较对照上升了 2 2 .5 3%、12 .8%、3.4 %。
Cotton industry occupies a pivotal position in the economic development in Xinjiang. However, the irrational fertilizer spread results in the reduction of the utilization ratio of fertilizers, high accumulation of nitrate in agricultural products and groundwater pollution. Meanwhile, the irrational spread of nitrogenous fertilizer makes the big consumption of soil active humic acid, deterioration of soil structure, reduction of soil fertility, etc. In this paper, the relationship between the spread quantity of nitrogenous fertilizer and the accumulated sunshine requirement of cotton in its growing stages is analyzed. The results show that the accumulated sunshine requirement of cotton is in an increase trend if the spread quantity of nitrogenous fertilizer varies in a range of 0～225kg/hm 2 but in a decrease trend if it varies in a range of 225～525/hm 2. If the spread quantities of nitrogenous fertilizer are all 225kg/hm 2, the accumulated sunshine requirements of cotton in its budding stage, bulling stage and bull opening stage reach the maximums (i.e., 516.558, 768.68 and 1309.02) and are increased for 22.53%, 12.8% and 3.4% respectively comparing with that of contract cases.
出处
《干旱区研究》
CSCD
2003年第3期226-229,共4页
Arid Zone Research
基金
新疆棉花优质高产机理及调控技术研究与应用 (NB十五-E- 0 2 )。
关键词
氮肥
施用量
棉花
生育期
日度
cotton
accumulate sunshine requirement
nitrogenous fertilizer
