苗期玉米对根区局部供水不同灌水下限的响应

对玉米苗期根系局部供水条件下生长、生理指标对不同灌水下限(占田间持水量60%、65%、70%、75%)的响应进行了研究。结果表明：占田间持水量65%的灌水下限（T₂）处理的株高、茎粗等生长指标明显优于其他处理，与全面灌溉(CK，占田间持水量60%)相比，T₂处理的生物积累总量提高了1.2%，而其他处理的生物积累总量降低；随着灌水下限的不断提高，苗期玉米叶片组织中脯氨酸、可溶性糖和植物组织相对含水量等生理指标不断降低，占田间持水量65%的灌水下限（T₂）处理的脯氨酸和可溶性糖的含量与CK处理结果相近，差异不显著。

Response of corn to different irrigation lower limits in seedling stage under alternate partial root-zone irrigation

The growth and physiological indicators of corn with different irrigation lower limits in seedling stage were investigated under alternate partial root-zone irrigation. The results showed that the plant height and stem diameter of T₂ (65% of field capacity as irrigation lower limit) wer e remarkably higher than those of other treatments. Compared with full irrigation (CK), the biological accumulation quantity of T₂ increased by 1.2%, but that of other treatments decreased obviously. With the increasing of irrigation lower limit, the content of soluble sugar and proline in corn leaves and the relative water content of plant tissue were decreased continuously in seedling stage; the content of soluble sugar and proline under T₂ was similar to that under full irrigation (CK) and the difference between them was insignificant.