杂交中籼高产育种的增产关键

Analysis of the Key Point of Medium Indica Hybrid Rice Breeding for High Yield

通过对 1999年省中籼区试及本所鉴定试验资料的相关及通径分析得出 ,有效穗数、最高苗数及每穗总粒数与产量呈正相关 ,有效穗与每穗总粒数、每穗总粒数与结实率和千粒重之间均呈较为显著的负相关。产量分析结果可以看出增加每穗总粒数及单穗谷重均可提高产量 ,但同时还应该注重穗、粒重的协调。单产 10 .0 t/ hm2的产量结构应该是 :在栽插 6 0～ 6 6万苗 / hm2的条件下 ,控制最高苗数达 370万～ 390万 / hm2 ,使有效穗达 2 5 0万～ 2 80万 / hm2 ,每穗总粒数 170～ 2 0 0粒 ,结实率 80 %以上 ,千粒重 2 7～ 2 9g。

By analysing the experimental data from the province regional test and our institute appraising test in 1999 with the coefficient of the correction and path analysis,the result indicated that effective panicles number (EPN), the maxium tillers number (MTN) and the spikelets number of per panicle (SNPP) were negative correction with the grain yield.There were the significant nnegative correction between EPN and SNPP,and between SNPP and the seed setting rate (SSR) or the weight of 1000 grains. The results of the yield analysis were as follows: to increase SNPP and the grain weight of per panide (GWPP) for the improvement of the grain yield,but, at the same time, the correspondence of the panicle and the grain weight should be attentioned. The grain yield structure of the 10.t/hm 2 should be: EPN 2.5-2.8 million, SNPP 170-200, SSR>80% , weight of 1000 grains 27-29g and 600-660 thousand/hm 2 basic seedings, and 3.7-3.9 million MTN/hm2.