省西灌区以往是关中小麦高产地区,但近年产量不仅落后于国内先进水平,也低于引泾灌区。影响产量提高的原因很多,从小麦生长发育的环境条件来讲,有下列一些因素:省西灌区土质粘重,保水保肥力强,小麦苗期发育慢,后期发育旺盛,群众称之“发老苗不发小苗”。在高水肥条件下,易形成麦田郁蔽,通风透光不良,株间湿度大, In the past, the Western Irrigation District of Shaanxi Province was the high yielding area for Guanzhong wheat. However, its output in recent years not only lagged behind the advanced domestic level but also lower than that of Jingjing Irrigation District. Affect the yield increase for many reasons, from the wheat growth and development of environmental conditions, in terms of the following factors: Western irrigation area sticky soil, water and fertility, wheat seedling growth is slow, strong development in the late period, the masses said No seedling seedlings ". In the high water and fertilizer conditions, the formation of wheat fields easily Yu, poor ventilation and transmissibility, humidity between strains,