但是，在干旱与半干旱地区，小麦生产受到干旱胁迫的严重制约。
However, drought stress strongly restricts wheat production in most arid and semi-arid areas.
但是，在干旱与半干旱地区，水资源短缺一直制约着玉米产量的进一步提高。
However, drought stress strongly restricts maize production in most arid and semi-arid areas.
干旱与半干旱区域的广大面积含有对农作物足以造成不利关系的高浓度溶性盐。
Extensive areas of the arid and semiarid regions have soils containing concentrations of soluble salts sufficient to adversely affect plant growth.
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