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从种子比重、粒重和粒厚的分级,以及比较谷粒大小对幼苗生长和产量的影响,研究了杂交稻的播前选种。汕优六号和威优六号的种子大小对幼苗生长有明显的影响。因比重不同而带来的影响,发根力>地上部干重>根数>叶面积。这种影响随叶龄增加而逐渐减少。种子比重不同的产量差异,未达到显著水准,但产量以比重1.16以上的为高。比重选,根据发芽势,成苗率,超过平均粒重的百分数,幼苗壮弱和产量高低,可将杂交稻种子分为三级。对杂交稻进行播前选种,选用饱满种子,能够壮苗增产。在种子难得,需要将全部种子作为种用的情况下,可以选种后分级播种。
From the grading of seed weight, grain weight and grain thickness, and comparing the effects of grain size on the seedling growth and yield, the pre-sowing of hybrid rice was studied. The seed size of Shanyou 6 and Weiyou 6 had a significant effect on seedling growth. Due to the difference in the proportion of the impact of hair root strength> aboveground dry weight> root> leaf area. This effect decreases with increasing leaf age. The differences in the yield of seeds did not reach a significant level, but the output was above 1.16 for a specific gravity. Specific gravity selection, hybrid rice seeds can be divided into three levels according to the germination potential, the seedling emergence rate, the percentage exceeding the average grain weight, the seedling weakness and the yield. The pre-sowing of hybrid rice selection, use full seeds, seedlings can increase production. In the rare seed, the need to use all the seeds as a seed, you can seed selection after sowing.