播种密度和方式对机插籼稻分蘖成穗的影响

为探讨育秧播种密度及方式对机插籼稻分蘖成穗的影响,本研究以常规籼稻黄华占,杂交籼稻F优498为供试材料,在不同播种方式及密度处理下,研究不同育秧处理机械移栽后水稻的分蘖成穗特性.结果表明,机插移栽后主茎4/0～9/0是一次分蘖发生的优势叶位,4/0～8/0是其分蘖成穗的优势叶位,产量贡献率总和达到50％左右;主茎3/0...

Effect of Seeding Density and Method on Tillering Characteristics of Mechanical Transplanting in indica Rice

Two indica rice varieties (conventional indica rice Huanghuazhan and hybrid indica rice F you 498) were used to investigate the effect of seeding densities (50g/plate and 100g/plate) and seeding methods (mechanized drilling seeding, mechanized broadcasting, artificial broadcasting) on tillering characteristics of machine--transplanted rice. The results showed that 4/0 to 9/0 and 4/0 to 8/0 of the main stem were the dominant leaf positions for formatting primary tillers and effective tillers, respectively, which contributed to approximately 50% of grain yield. The superior leaf position for secondary tillers group emergence was 3/0 to 7/0, and 4/0 to 7/0 for ear-bearing, which contributed 30.20% to yield. The 5/0 leaf position was superior in formatting the primary and secondary effective tillers. Among different sowing methods, the tiller emergence rate and effective tillers percentage of mechanized drilling were higher than those of mechanized broadcasting and artificial broadcasting. The largest and smallest contribution to the yield of superior leave positions for primary tillers was the mechanized broadcasting (51.90%) and mechanized drilling seeding (46.50%), respectively. Mechanized drilling seeding made the largest yield contributions rate of secondary tillers in dominant leaf position (33.30%). Compared to 50 g/plate, 100 g/plate treatment led a higher contribution percentage of main stem and primary tillers, but a lower contribution percentage of secondary tillers. Mechanized drilling with lower seeding density increased the number of grains per panicle and 1000-grain weight between the main stem, the primary and the secondary tillers, which possessed higher effective tillers percentage of secondary tillers. Overall, the coordinated regulation of mechanized drilling with sparse sowing density could improve rice yield by increasing the emerging and effective percentage of tillers at the superior leaf positions. The results of this study can be used to select better seeding methods for machine-transplanted seedlings, and provide a theoretical and practical basis for the rational use of dominant leaf position of machine transplanting.