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旱地小麦生产的主要制约因素是“旱”和“薄”,根据多年调查和试验,年降水低于300mm时,“旱”是主要矛盾,是小麦生产的第一制约因素;降水高于300mm,低于800mm时,“薄”是主要矛盾。“肥力”是小麦生产的第一制约因素。但在一般情况下,我国北方95%以上的旱地年降水都高于300mm,“薄”是小麦生产的主要矛盾。在临汾地区,山区旱地的年降水高于平川旱地,但山区旱地的小麦产量却低于平川旱地,这一事实证明了以上观点。
According to years of investigation and experiment, when the annual precipitation is less than 300mm, “drought” is the main contradiction and the first restricting factor of wheat production. The precipitation is higher than 300mm, Below 800mm, “thin” is the main contradiction. Fertility is the number one constraint to wheat production. However, under normal circumstances, more than 95% of the precipitation in dry land in northern China is higher than 300mm. “Thin” is the main contradiction in wheat production. In Linfen area, the annual precipitation in dryland in mountainous area is higher than that in flatland dryland, but the wheat yield in dryland in mountainous area is lower than that in plain dryland. This fact proves the above point of view.