不同施氮方式及抛栽密度对长秧龄抛秧水稻产量形成的影响

以两系杂交水稻Ｆ１３１Ｓ／Ｒ４０２和培两优特青为材料，研究了不同施氮方式及不同抛栽密度对长秧龄抛秧栽培产量形成的影响。结果表明：后期氮肥施用比例提高及抛栽密度的适当加大，能勉中快长秧龄抛栽水稻群体茎蘖增长速度，提高Ｎ素的吸收及干物质积累、扩大叶面积指数、增强单们面积群体光合量，形成更多的有效穗数。使产量提高；增大抛栽密度、，适当控制前期施氮量，提升后期用氮比例，是长秧龄抛秧栽培较为理想的搭配方式。

Effects of Different Nitrogen Application Methods and Different Densities on the Yield of Rice Associated with Scattered-Planting with Long-age Seedlings

Rice scattered-planting is a new agronomic practice by which seeds are sowed in the plasticdiscs with many holes and the seedlings are scattered when transplanted to the field. It needs no transplanting by hand and much less labor. The effects of different nitrogen application methods and different densities on the yield of rice associated with scattered-planting with long-age seedlings were studied. The results are as follows. Increasing N application at the later growth stage and increasing the scattering density appropriately could accelerate tillers, increase absorption of N and accumulation of dry matter, enlarge leaf area index (LAI), enhance the photosynthesis, promote formation of more bearing panicles and improve yield. Increasing the density, reducing the rate of N application at the eraly growth stage and increasing the rate of N application at the later growth stage were the suitable collocation for scattered-planting rice with long-age seedlings.