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降水量有限且不稳定的地区,如半干旱地区,旱作(无灌溉)条件下作物产量受播种时土壤蓄水最和作物对其利用的强烈影响。例如,Jones和Hauser(1975)指出,在南部大平原,播种时土壤贮存的植物可利用水每增加1米~3,高粱籽粒产量可增加1.7公斤。又如,在南部大平原,根据单位用水所得籽粒产量估算的高粱籽粒生产的水分利用率(WUE)
In areas with limited and unstable precipitation, such as semi-arid areas, crop yields under dry (non-irrigated) conditions are strongly influenced by the most impacted soils and their use of the crop when sown. For example, Jones and Hauser (1975) point out that in the southern Great Plains, grain yield of sorghum can be increased by 1.7 kg for every 1 to 3 meters increase in plant-available water stored in the soil in the southern plains. In another example, in the southern Great Plains, the water use efficiency (WUE) of sorghum grain production as estimated from the grain yield per unit of water used,