摘要
水、N是影响作物N、P、K吸收的重要因素。通过对 6个水分等级和 5个N肥等级相互搭配的研究结果表明 ,高水、高N处理不利于小麦N吸收 ,而玉米是耐肥作物 ,相同灌水条件下 ,玉米的吸N量随施N量的增加而增加。在低灌水条件下 (W 0、W 1处理 ) ,玉米子粒吸N量很低 ,变幅为 0～ 17 3kg/hm2 ,并且不受施N量的影响 ;而小麦子粒吸N量仍达 36 6～154 2kg/hm2 。小麦与玉米吸P量的变化趋势与吸N量的变化趋势非常接近。但是 ,作物的吸K量随灌水量增加有明显增加的趋势 ,在玉米上表现尤其明显 ,并且作物的吸K量主要存在于茎秆中 ,因此 。
Irrigation water and nitrogen fertilizer are key factors governing N, P, K uptake by crops. By studying on different combinations of irrigation water and nitrogen fertilizer which consist of six levels of irrigation water and five levels of N fertilizer, the experiment showed that treatments with high levels of irrigation water and high levels of nitrogen fertilizer were unfavorable for N uptake by winter wheat, while maize was fertilizer tolerable crop and the amount of N uptake by maize increased with nitrogen fertilizer when irrigation water remained constant. When irrigation water was in low level (such as: level of W0 or W1), the amount of N uptake by maize grain was very low which ranged from 0 to 17 3kg/hm 2 and was independent of applied nitrogen fertilizer, while the amount of N uptake by wheat grain reached as high as 36 6 to 154 2kg/hm 2. The curve of P uptake by both winter wheat and maize was similar to that of N uptake. However, the amount of K uptake by both of them increased with irrigation water, especially for maize. Moreover, most of absorbed K disturbed in the straw. Therefore, it is very important for us to publicize returning straw back to the farm field after harvest.
出处
《植物营养与肥料学报》
CAS
CSCD
2000年第3期260-266,共7页
Journal of Plant Nutrition and Fertilizers
基金
中国科学院"九五"重大项目! (KZ95 1 A1 30 1 )
"九五"特别支持项目! (KZ95T 0 4 0 1 )
国家重大基金!(49890 330 )资助
关键词
水肥
小麦
玉米
吸收
氮
磷钾
irrigation water and nitrogen fertilizer
winter wheat
maize
N, P, K uptake
