作 者：
王美娥;钟宗石;陈明;欧阳玉朋;叶高潮;曹晓利;孙小明;赵田芬
摘 要：
[目的]探明大田栽培条件下不同播期对机直播水稻分蘖特性的影响。[方法]以淮稻5号为研究材料,采取对典型水稻田块调查和试验相结合的方法,研究机械直播栽培模式下不同播期对水稻分蘖的发生、成穗特点以及产量的影响。[结果]适期早播,机直播稻单株成穗数较多,第2~4叶位是分蘖发生的优势叶位,分蘖穗的穗部性状较好,虽然第1叶位的成穗数在茎蘖组成中所占的比例较大,但其穗部性状较差,对最终产量贡献不大;随着播期的推迟,单株成穗数降低,分蘖优势叶位减少,在晚播处理下(6月15日),机直播稻只有第2、3叶位分蘖是成穗数的重要组成部分,其穗部性状较好,对产量贡献较大,第4、5叶位受抑制极显著。[结论]在海丰种植地区,机直播稻应在适宜的播期范围内及早播种,该试验适宜播期为6月5日之前。此外,通过科学栽培措施促进机直播稻第2~4叶位早发、多发,充分利用优势叶位的增产潜力,对海丰地区机直播稻实现高产、稳产具有重要意义。
译 名：
Tillering Characteristics and Its Relationships with Yield Components of Mechanical Direct-seeding Rice at Different Sowing Date
作 者：
WANG Mei-e;ZHONG Zong-shi;CHEN Ming;Shanghai Haifeng Modern Agriculture Co.,Ltd.;
关键词：
Mechanical direct-seeding rice;;Sowing date;;Tillering;;Yield
摘 要：
[Objective] The research aimed to explore the tillering characteristics of mechanical direct- seeding rice at different seeding date in field production.[Method]The rice variety was Huaidao 5,the methods of combining investigating the typical rice field with the experiment was used to study the effects of different sowing date on tiller emergence,panicle characteristics and yield of mechanical direct- seeding cultivation methods.[Result]Sowing early at suitable date,panicle number per plant was more,and the main tillering zone was located between from leaf 2 to leaf 4 and good characters were observed for the panicles developed from these leaves. Although the panicle number of leaf 1 had a big proportion in the composition of a tiller spike,the panicle traits were bad and made little contributions to the yield. Along with the delayed sowing date,panicle number per plant was low,and the number of superior leaf position was less,on June 15 only leaf 2 and leaf 3 were the superior positions for tiller emerging and panicle formation,had better panicle traits and made great contributions to the yield. The leaf 4 and leaf 5 were inhibited very significantly.[Conclusion]Mechanical direct- seeding rice should be sown early at the suitable date( before June 5) in Haifeng area. It was of great significance to enhance the leaf 2 to leaf 4 tillers' emergence and flowering frequency,explore the way to increase yield potential of the superior leaf position through proper management measures to achieve high and stable yield of mechanical direct- seeding rice in Haifeng area.
