直播油菜产量、产量构成及品质性状的综合分析

油菜直播方式在长江中下游得到广泛运用,为因地制宜地制定高产稳产栽培措施,探究不同环境条件下种植密度和施肥量对直播油菜产量、产量构成及品质的影响,选取江西宜春、湖北荆州、安徽六安3个试验点,以中双11号、中油杂12号为材料,设置3个密度(1.3×105·hm-2、2.6×105·hm-2、5.2×105·hm-2和2个施...

Comprehensive analysis on yield and quality parameters of direct-seeding rapeseed in different environments

For stable and high yield of rapeseed in the Yangzi River area, yiled and quality of direct-seeding rapeseed were evaluated on the effects of density, nitrogen application and varieties in 3 different environments.Field experiments were conducted with 2 varieties(Brassica napus cv Zhongshuang 11 and Zhongyouza 12) under 2 nitrogen applications(90 and 180 kg/hm²) and 3 planting densities(1.3×10⁵, 2.6×10⁵, 5.2×10⁵ plants per hectare) in3 sites(Yichun, Jingzhou and Lu’an). Results showed that rapeseed yield had significant increase with density. The yield of high density(5.2×10^(5 )plants per hectare) was 25.6% higher than that of low density, and 10.8% higher than that of medium density. Meanwhile, high density significantly increased branch numbers per unit area, and showed significant positive correlation with silique number from both main and branch recemes. Compared with N2(180 kg/hm²), yield of N1(90 kg/hm²) was reduced by 25.9%,36.9% and 28.9% in 3 sites, respectively. The high density had no significant effect on seed quality, while decrease of nitrogen fertilizer increased oil content and glucosinolate at Jingzhou, but reduced protein at Jingzhou and Lu’an. Comprehensive score showed extremely differences among the environments and cultivation conditions. Order of the investigated traits were followed by their comprehensive scores from high to low: aboveground dry biomass, effective siliques per unit area, branches, 1000-seeds weight, effective length of main raceme, seeds per silique, and oil content.