论文部分内容阅读
近几年来,银川灌区小麦“坐苗”的问题比较突出。所谓“坐苗”是小麦在拔节前后,由于环境条件不良,引起小麦死根,枯叶,生长缓慢,甚至停止生长的一种现象。此后,随着环境条件的好转,植株恢复生长,但终因生长量不足,穗小粒少,以及收获穗数减少而造成减产。一般小麦坐苗后减产约在10％以上。根据灌区各县调查资料,小麦“坐苗”年年都有发生,但危害程度则因地区、土壤性质、盐碱含量、施肥水平、淌水时间以及当年气象条件等而异。一般来讲,银北地区排水不
In recent years, Yinchuan Irrigation wheat “sit Miao” problem is more prominent. The so-called “sit Miao” wheat before and after jointing, due to poor environmental conditions, causing dead wheat, dead leaves, slow growth, or even stop growing a phenomenon. Since then, as the environmental conditions improved, the plants regained their growth, but at the end they lost production because of insufficient growth, fewer spikelets and fewer ears. General wheat seedling production after about 10% reduction. According to the survey data of counties in the irrigated area, wheat “sit-miao” occurs annually, but the degree of harm varies according to regions, soil properties, saline-alkali content, fertilization level, tidal current time, and current meteorological conditions. In general, the northern part of the drainage is not