In order to obtain the optimum sowing date of buckwheat ,two cultivars (Wensha and Xiqiao 1) were selected to investigate the grow th period and its structure ,agronomic characters , dry matter accumulation ,yield and yield components of buckwheat .The results showed that ,with the delaying of planting date ,the days from sowing to emergence ,the days from emergence to blooming and the growth period of buckwheat were significantly shortened .The height ,stem di-ameter ,anthotaxy number ,branch number and stem node number increased at first and then de-creased with the sowing date delayed for both of the two buckwheat cultivars .With the delay of sowing date ,the dry matter weight was gradually increased at first and then decreased in mature period .The appropriate sowing date could improve the yield of buckwheat ,which increased at first and then decreased with the delay of seeding time .The best sowing date for Wensha and Xiqiao 1 was 12th March and 2nd March ,respectively ,which gave the highest yield ,1 776 .8 kg/ha and 2 696 .0 kg/ha ,respectively .%为了探讨荞麦高产的最佳播期，以温莎和西荞1号为材料，测定不同播期下荞麦的生育期和农艺性状、干物质积累、产量及其构成。结果表明，随着播期的延迟，荞麦播种至出苗、出苗至花期的时间减少，生育期明显缩短。荞麦的株高、茎粗、花序数、分枝数、节间数总体均随着播期的推迟呈先升高后降低的趋势，两品种表现基本一致。成熟期荞麦的干物质积累量随播期的延迟呈先增加后降低的趋势。适宜的播期可提高荞麦的产量，随播期的推迟荞麦产量先升高后降低，温莎和西荞1号品种分别以3月12日和3月2日播种表现最好，产量最高，分别为1776．8 kg/hm2和2696．0 kg/hm2。
展开▼
