不同栽植密度杂交稻分蘖成穗规律及其穗部性状研究

Studies on the Characters of Panicle and its Formation Rules from Tillers of Hybrid Rice at Different Transplanting Densities

以杂交中籼Ⅱ优838和杂交中粳信杂粳1号为试验材料,设计30万穴/hm2,22.5万穴/hm2,15万穴/hm2和7.5万穴/hm2四个栽植密度,研究了两组合在不同栽植密度下的分蘖成穗规律和穗粒结构特点。试验表明:随着密度的降低,水稻的有效分蘖期和最高分蘖期相应延迟,稀植栽培的分蘖成穗率明显提高,单株有效穗有较大程度增加,同时,种植密度的下降使得各个时期分蘖成穗的经济性状整体优化,每穗粒数、每穗实粒数、着粒密度增加,中后期的分蘖成穗在产量构成中的比重明显提高,进而提出稀植栽培对穗型较大和分蘖力较强的水稻品种有利于发挥其增产潜力,提高水稻产量。

Using hybrid indica rice Ilyou 838 and hybrid japonica rice xinzajing 1 as experiment material, designing four transplanting densities of 300,000 holes/ hm^2, 225,000 holes/hm^2, 150,000 holes/hm^2 and 75,000 holes/hm^2, we studied the characters of panicle and its formation rules from tillers of the two combinations at different transplanting densities. The experiment indicated that, with density reducing, paddy rice＇s effective tillering time and the highest time correspondingly delayed, the panicle formation rate obviously enhanced by thinly plant cultivation, the effective ears from single plant had increased in a great degree. At the same time, the economical character of tiller to panicle at every stage had been optimized wholly with the planting density drop. each ear of number of seeds, each ear of solid number of seeds, a grain of density is increasing, mid and late part minute tiller to panicle in the output constitution proportion distinct enhancement, then proposed that thinly planting cultivation is advantageous in displays rice production potential and increase output for big ear and the strong tillering rice varieties.