拔节期干旱对春玉米产量性状及抗旱性的影响

在干旱区大田条件下,选用当前生产上主推密植型玉米品种,在拔节期不同干旱胁迫度下,对其产量性状及抗旱性进行研究,结果表明,不同旱胁迫度下百粒重与产量均呈极显著正相关;随干旱胁迫程度增加,穗粒数对产量所起的直接效应明显增加,而穗粒数则与行粒数呈极显著正相关,所以百粒重是决定产量的首要因子,其次是穗粒数,而行粒数则决定了穗粒数。品种抗旱性分析结果表明,大丰30丰产性较好,而抗旱性一般;富友968抗旱性最好,而丰产性较差;潞玉36则抗旱性和丰产性均较差。

Effects of Drought Stress at Jointing Stage on Yield and Drought Resistance in Spring Maize

In the field of arid zones, the mainly planted and high density-resistant maize varieties of current production were selected to be studied the relationship between yield components and drought resistance at jointing stage. The results showed that there was significant positive correlation between 100-grain weight and yield under different degrees drought stress. With the increase of drought stress, the grain number per kernel played a direct effect on yield, while grain number per kernel and grain number per row had positive correlation each other. The 100-grain weight was the primary factor to decide yield, followed by grain number per kernel, but grain number per kernel was determined by grain number per row. Evaluation of drought resistance showed that Dafeng 30 could get a better yield but drought resistance was general, Fuyou 968 had a strong drought resistance, but with a low yield, and both yield and drought resistance of Luyu 36 were poor.