论文部分内容阅读
选用玉米品种郑单958与先玉335,在大田条件分别于7叶全展期(T1)、13叶全展期(T2)、吐丝期(T3)、吐丝后15 d(T4)进行50%遮光处理,研究不同时期遮光对玉米干物质积累与产量性能的影响。结果表明,不同时期遮光均导致玉米终极生长量(a)、干物质积累速率最大时的生长量(Wmax)、最大干物质积累速率(Gmax)、平均叶面积指数(MLAI)、平均净同化率(MNAR)和收获指数(HI)降低,致使干物质积累与产量不同程度降低,吐丝后15 d遮光对干物质与产量影响最大。在产量构成因素中,遮光处理对穗粒数与千粒重影响较大,穗粒数减少占主导,其次是千粒重的降低。
The maize varieties Zhengdan 958 and Xiangyu 335 were used in 50% field condition in 7 field full leaf stage (T1), 13 leaf full stage (T2), silking stage (T3) and 15 day post silking stage (T4) Shading treatment to study the effects of shading at different periods on dry matter accumulation and yield performance of maize. The results showed that the shading at different periods led to the increase of the ultimate growth (a), Wmax, Gmax, MLAI and average net assimilation rate (MNAR) and harvest index (HI) decreased, resulting in different degrees of dry matter accumulation and yield reduction. Shading 15 days after silking had the greatest impact on dry matter and yield. Among the components of yield components, shading treatment had a significant effect on the number of grains per spike and 1000-grain weight, the decrease of grains per spike led to the decrease, followed by the decrease of 1000-grain weight.