不同水肥处理的沙地玉米生长分析

Corn Growing Analysis under Different Treatments with Fertilizer and Water

在奈曼站农业观测场进行了５种水肥处理的玉米生长试验。结果表明，各处理的玉米株高快速生长期均从６月下旬始，至８月初达最高值。不施肥处理株高和茎粗生长在拔节后期落后于其他处理，早于其他处理停止生长。根量快速增长从６月底开始，至７月底结束，８月下旬根开始死亡，至９月２０日，细根数量减少至峰值期的５０％。高肥处理的根系增长率高于其他处理，其根密度值最大，不施追肥处理的最小。不浇水的处理在７月初雨季到来时根系开始快速增长。不施追肥的处理早于其他处理７ｄ停止根系的增长。５种不同处理的根系生长动态趋势一致，均为单峰形。施肥量最大的处理（Ｔ１）产量最高，不施肥的处理产量最低。玉米生长期多次灌溉并不能促进生长，相反使产量减少。

The corn growing dynamics was studied by using the 5 treatments of nutrition and water in Naiman Desertification Research Station in Inner Mongolia. The results show that the fast high growing stage of the 5 treatments all started in the last ten days of June and reached the maximun in early August; Corn in applying no fertilizer plots stopped growth of height and stem thick more early than the others. Fine roots number increased rapidly from the end of June and continued for one month. The increasing rate of roots in high applying fertilizer plots was larger than that in the others; In no irrigation plots, the corn roots numer increased rapidly by the rainy season in early July; In no top application plots roots stopped growth 7 days earlier than that in the other treatments. The root growth dynamics of all different treatments have similar curve with one peak. The yield of corn was the highest in most applying fertilizer treatment plots and the lowest in no fertilizer plots.