玉米拔节后不同水分处理对植株性状和水分利用效率的影响

采用田间试验的方法,在不同灌水条件下,研究吉林省西部半干旱区春玉米植株性状、水分利用特性、茎秆强度与植株性状的关系。结果表明:随着灌水量的增加,玉米株高增加,穗位高和茎秆强度有所增加,对茎粗的影响相对较小。干旱胁迫下适度灌水,玉米的茎秆强度和株高、茎粗及穗位高呈正相关关系;在灌水量达田间持水量100%的处理下,玉米的茎秆强度和株高、茎粗及穗位高呈负相关,即玉米的茎秆强度随株高和穗位高的增加而呈降低趋势,从而增加了倒伏的风险。随着灌水量的增多,玉米产量提高不明显,水分利用效率显著降低。

Effect of Water Treatments after Jointing Stage on Plant Characters and Water Use Efficiency of Maize

Effect of water treatment on plant character and water use efficiency of maize was investigated by field plot experiments in semiarid region of Western Jilin province. The results showed that with the increase of water, amount plant height, stem strength and ear height increased, the influence was relatively small on stem diameter. Under the condition of moderate irrigation stem strength were significantly positively correlated with plant height, stem diameter and ear height, which showed negative correlation instead, with the excessive irrigation treatment, that was with the increase of plant height and ear height, stem strength decreased, thus increasing the risk of lodging. In addition, the increase of maize yield not significantly and the water use efficiency were significantly decreased.