不同栽培密度和氮肥施用量对Q优6号生育特性及群体特点研究

Effects of Planting Densities and Nitrogen Fertilizer Rate on Growth Characteristics and Group Characteristics of Qyou No.6

以超级稻Q优6号为材料,研究2个氮肥施用量和4个栽培密度下水稻的群体茎蘖动态、叶面积动态、物质生产特性及产量构成特点。结果表明,在225kgN/hm2施氮水平内,施氮水平相同时,随着密度增加,单穴的茎蘖数和有效穗数、单穴叶面积、单穴干物质重、每穗粒数减少,而单位面积的茎蘖数和有效穗数、叶面积指数、单位面积干物质重增加。种植密度相同时,增施氮肥能促进分蘖,增加有效穗数、单穴叶面积、叶面积指数和干物质积累。低密度(A1、A2)种植时,增施氮肥能提高产量,高密度(A3、A4)种植时,增施氮肥会引起减产。当移栽穴数为30.0万穴/hm2、施纯氮150kg/hm2时,既能降低生产成本,又能实现高产。

Effects of planting densities and nitrogen fertilizer rate on tiller development, leaf area dynamics, dry matter accumulation,and grain formation in super nce were stumefl using ~you ~o. u. - numbers and effective panicles per strunk,leaf area and dry matter weight per strunk and grain number per spike decreased with the increase of density at the same nitrogen level of 225kg/hm2 ,but tiller numbers and effective pan- icles per area, LAI, dry matter weight per area increased. Increasing nitrogen application rate could increase tillering in the same planting density, effective panicles, leaf area per strunk, LAI, and dry matter weight. When nitrogen ap- plication was increased, yield increased in low density planting（ A1 and A2）, but yield decreased in higher density planting（ A3 and A4）. Both high output and low production cost were achieved with strunk density in 300,000/hm2 at the nitrogen level of 150kg/hm2.