栽培密度和播期对杂交水稻广两优272产量形成的影响

Effects of Planting Density and Sowing Date on Yield Formation of Hybrid Rice Guangliangyou 272

考察了不同栽培密度和播期对广两优272产量形成的影响,结果表明,广两优272栽培密度为22.8万穴/hm2、播期在4月15日时产量最高。随着广两优272栽培密度增大,茎蘖数峰值增加而无效分蘖增多,有效穗数增多而穗实粒数减少;播期推迟,该品种分蘖峰值滞后,无效分蘖增多而穗实粒数减少。栽培密度、播期两者均与产量呈抛物线关系,在栽培密度25.8万穴/hm2时,广两优272产量最高可达9 611.7kg/hm2;4月25日后播种,广两优272产量显著降低,提前播种产量略有增加。广两优272作为一种高产迟熟中稻品种,在湖北省种植适宜播期为4月中旬或略提前,栽培密度应保持25.8万穴/hm2左右。

Effect of different planting density and sowing date on yield formation of Guangliangyou 272 were studied. The results showed that Guangliangyou 272 under cultivated density of 22.8 ×10^4（P hill/hm^2 or its sowing date on April 15 had gain the highest yield. With the increase of plant density, tiller numbers peak value of rice and unavailable tiller were increased, Panicle number and grain number per spike were decreased. When sowing date was postponed, appearance date of tiller peak value was delayed, the unavailable tiller was increased and the number of grains per spike was reduced. Parabolic relationship existed between planting density and yield. So did with sowing date and yield. The rice production was up to 9 611.7 kg/hm^2 when its planting density was 25.8 ×10^4 hill/hm^2. When the rice was sown after the April 25th, the yield was decreased. When it was sown early, the yield increased slightly. As a high-yield and late maturity hybrid rice varieties, Guangliangyou 272 is suitable to be sown in mid-April in Hubei Province or slightly in advance, with the planting densities around 25.8×10^4 hill/hm^2.