限量灌溉和施氮水平对春玉米生长及生理特性的影响

Effects of limited irrigation and nitrogen supply rates on growth and physiological characteristics of spring maize

以春玉米品种金穗2号为材料,研究限量灌溉和施氮对春玉米生长及生理指标的影响。结果表明,较低的灌水量和施氮水平对春玉米苗期的叶面积和冠层的生长有一定的促进作用,但严重缺水会抑制其生长发育。灌水量适中(1012 m3/ha),春玉米苗期平均叶面积显著高于其他处理;施氮水平达75 kg/ha可以满足春玉米苗期生长的需要,而大量施氮会造成烧苗,说明高氮和充分供水不一定利于玉米的生长。

The present experiment has been conducted to study the effects of limited irrigation and nitrogen supply on growth and physiological characteristics of spring maize using the variety Jinsui 2 as test material.The results showed that lower water and nitrogen levels had promotional effects on leaf area and crop canopy growth of spring maize at seedling stage,but severe water shortage inhibited the growth and development of maize.The average leaf area of maize in treatment B3（1012 m3/ha） with suitable irrigation amount was found significantly higher than the other treatments.The nitrogen level A1（75 kg/ha） was found to accomplish the growth requirements of corn,while the excess application of nitrogen damaged corn seedlings.These results indicated that high nitrogen and adequate water supply was not always beneficial for maize growth.