播期对洛麦21生长发育的影响

Impact of Sowing Date on Growth and Development of Luomai 21

对洛麦21的生育规律进行了研究。结果表明：洛麦21的幼穗分化总体表现为前期慢、后期快，随着播期的推迟，幼穗分化的时间缩短。平均灌浆速率在1．453～1．697之间，在10月4日播种下平均灌浆速率最大，灌浆时间35～38d，千粒重稳定在45g以上。针对灌浆速率而言，以10月上旬适期播种对洛麦21最为有利。洛麦21主要依靠主茎和第1、2个一级分蘖成穗。随着播期的推迟，洛麦21的总分蘖数明显降低，成穗率提高。以10月14日播种的产量最高。

The growth and developmental laws of Luomai 21 were studied, the results showed that the differentiation of young spikelet generally revealed slow trend at prophase and fast trend at anaphase; along with the delaying of sowing date, the duration of young spikelet differentiation shortened. The average rate of filling was between 1. 453 and 1. 697 ; when Luomai 21 was sown on October 4th, the average filling rate was the highest, the filling duration was 35 -38 days, and the 1000 -kernel weight was more than 45 g. Aiming at filling rate, the optimum sowing date of Luomai 21 was mid - October. Luomal 21 relied mainly on main stem and the first or second tiller into panicle. Along with the postponement of the sowing date, the total tillers of Luomai 21 decreased significantly, and panicle -forming rate increased. The yieht of Luomai 21 sown on October 14th was the highest.