【摘要】 通过不同播期、播种密度和氮肥运筹方式对不同冬小麦品种籽粒产量及构成因子影响的研究,探讨了通过调控播期、密度及氮肥运筹方式实现不同品种丰产高效的可能性。试验结果表明,播期、播种密度和氮肥运筹方式均显著影响小麦产量及产量构成因子,播期以10/15￣10/22最为适宜,播种密度以120万/km2￣240万/km2为宜,氮肥运筹方式以N210(3:5:2)最好,其次为N210(5:5)。保证供试小麦品种实现9000kg/hm2产量的高产途径为主茎和分蘖并重,适宜的产量结构为:4:4:4,即亩有效穗数39.4￣44.4万,穗粒数35.3￣40.0,千粒重40.2￣45.8g。更多还原

【Abstract】 Effects of sowing date, planting density and nitrogen application regime on grain yield and compositions in winter wheat .It was shown that all three factors contributed significantly to yield but depend-on the cultivars of wheat. The most suitable sowing period was from 10/15 to 10/22 and planting density was from 120×104plants/hm2 to 240×104 plants/hm2. Meanwhile, the first suitable nitrogen application technique was 210kg/hm2(basal N fertilizer: jointing stage N fertilizer: booting stage N fertilizer =3:5:2) and the second suitable nitrogen application technique was210kg/hm2(basal N fertilizer :jointing stage N fertilizer =5:5).To make the winter wheat have a high yield above 9000 kg/hm2, stem and tiller were indicated equal important, and suitable yield components proportion was 4:4:4, viz. the panicle number was from 39.4×104 to 44.3×104 plants per 666.7m2, the grains number per ear was from 35.3 to 40.0 and the 1000grains weight was from 40.2 to 45.8g.更多还原