摘要：Lime content of soils is one of the most important factors limiting zinc (Zn) availability to crops. It is also known that there may be a close relationship between soil moisture levels and Zn use efficiency of plant species. Thus, further studies would be needed concerning these relationships under the varied soils. In this study, a pot experiment was conducted using calcareous soil by growing different soybean genotypes of A-3735, A-3127, SA-88, S-4340 and Ilisulu-20. Zinc fertilizer at the levels of 0, 5, 10 µg Zn g-1 as ZnSO4.7H2O was applied to the soil. Pots were irrigated based on increasing soil matric potentials of -65 kPa (I1), -45 kPa (I2) and -25 kPa (I3), respectively. After harvest, plant dry matter yield was recorded, and Zn concentrations in tops of soybean plants were determined. Dry matter yield, Zn content and accumulations significantly (P<0.01) differed among soybean genotypes under the Zn treatments. Soil moisture stress significantly decreased physiological responses of soybean genotypes to Zn treatments. Significant differences also existed among the soybean genotypes in their ability to accumulate Zn in leaves. The results have also clearly revealed that detailed georeferenced maps would be useful to manage the relationship between site specific soil moisture levels and Zn use efficiency of crops, especially on calcareous soils.
