氮素基蘖穗肥施入比例对机插水稻生育及产量的影响

Effects of different rate of nitrogen base-tillerand and panicle fertilizer on growth and yield of machine-transplanted rice

为探讨氮素基蘖穗肥不同施入比例对机插水稻生育及产量的影响,以超级稻"盐丰47"为材料,采用小区对比方法进行了田间试验。结果表明,提高基蘖肥施入比例,可提高水稻群体最高茎蘖数与齐穗期有效叶面积率、干物质积累量;提高穗肥施入比例,可提高水稻茎蘖成穗率与齐穗期高效叶面积率、净光合速率,可提高齐穗后水稻群体干物质积累量占籽粒产量百分比;单位面积收获穗数、颖花量及收获指数随着穗肥施入比例的增加表现为先增后减。在每667 m2施氮(N)18 kg的前提下,氮素基蘖穗肥比例20∶50∶30的处理获得最高单产为每667 m2762.1 kg。

Yanfeng47 was used as material, using plot contrast test method, were stuided effects of different rate of nitrogen base-tillerand panicle fertilizer on growth and yield of machine-transplanted rice were studied. The results showed that increasing the rate of base-tillerand fertilizer could increase the tiller number of rice tillering peak, rate of effective leaf area on full heading and dry matter accumulation; increasing the rate of panicle fertilizer could increase spike rate of tiller, rate of highly effective leaf area and net photosynthetic rate of full heading time, dry matter accumulation after full heading time. The effective panicle number and spikelet numbers per unit area, harvest index first increased and then decreased with the increase of rate of panicle fertilizer. The highest yield was 762.1 kg per 667 m^2 when the treatment of nitrogen rate was 18 kg per 667m^2, and the rate of nitrogen base-tillerand and panicle fertilize was 20：50：30.