搁田始期对水稻成穗率、产量形成和群体质量的影响

 1992年至1994年在江苏省扬州、宜兴、金湖、盐城郊区进行试验，结果表明：1)适当提早搁田有利于稳定穗数提高成穗率，改善群体质量，增加有效叶面积率，增加每穗总粒数，提高抽穗期的单茎茎鞘重和抽穗至成熟期的干物质重量。2)在基蘖肥用量占总施氮量60%时，总茎蘖苗数达预期穗数80%时搁田，能显著提高成穗率和群体质量。在N叶期搁田，并持续1个叶龄期，对N叶内的分蘖芽长度有抑制作用，茎蘖生长呈迟缓状态

Effect of the Beginning Period of Draining Paddy Field on the Percentage of Effective Tillers,Yield Formation and Population Quality in Rice

Experiments were carried out in several sites in Jiangsu Province in 3 years. Results are as follows:1)Draining paddy field in advance properly is beneficial to obtaining stable panicle number, raising percentage of effective tillers and improving population quality, increasing ratios of effective leaf area and total grain numbers per panicle, raising single stem and sheath weight at heading stage and the dry matter weight accumulate from heading to maturing. 2) Under the experiment of the numbers of tillers is about 80% of expected panicle numbers and basetillering fertilizer applied 60% of total, draining paddy field would significantly increase the percentage of effective tillers and population quality. It was clearly shown that draining paddy field at N leaf-age and keeping one leaf-age long would prohibit the length of the tiller bud in N leaf axil, and could make it grow slowly.