播种量对少蘖型水稻群体光合作用的影响

以少蘖型水稻(Oryza sativa L.)品种为研究对象,选择人工撒播播种方式,设置了2(Z1)、3(Z2)和4kg/667 m2(Z3)3种不同的播种量,研究不同播种量对水稻生理生态指标的影响。结果表明,分蘖数随播种量增加而递减。光合作用方面,在孕穗期,随着播种量增加,高密度群体净光合速率显著降低,Z3和Z2处理比对照Z1分别减少34.08%和9.44%;在齐穗期,高密度群体Z3和Z2处理净光合速率显著低于对照Z1,Z3和Z2分别比Z1降低9.50%和6.70%,表明高密群体具有较强的自身调节能力。建议少蘖型水稻品种直播可以通过增加密度的方式获得高产。

Effects of Sowing Amount on Photosynthesis of Less Tiller Rice Population

Using rice﹙Oryza sativa L.﹚ with less tiller as the research object,direct seeding as the sowing method,setting up 3 different sowing amount[2 kg/667 m2﹙Z1﹚,3 kg/667 m2﹙Z2﹚,4 kg/667 m2﹙Z3﹚],the effects of different sowing amount on physio-logical and ecological indexes of rice were studied. The results reflected that the tiller number decreased with the increase of sowing amount. The results of photosynthesis showed that high density group net photosynthetic rate decreased significantly at the booting stage. But In the full heading stage,the gap greatly reduced benefit from its own self regulating ability. According to the results of this study,we suggest that rice with less tillers using direct seeding can increase the density for maximizing yields.