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在亚热带红黄壤地区稻田土壤上 ,研究 5个双低油菜新品种 (品系 )和 2个常规油菜品种在不同施肥条件下的氮、磷养分吸收积累差异及对生物学产量和籽粒产量的影响。结果表明 ,双低油菜品种中油 1 1 9、中双 4号苗期至成熟期的植株氮浓度略低于常规油菜中油 82 1 ,品种间的植株磷浓度差异不显著。苗期中双 4号、中油 1 1 9的氮吸收量大于中油 82 1和 831 3,花期则反之。生育前期不同品种磷吸收量的差异不显著 ,成熟期双低品种磷积累量低于常规品种。在 NK基础上增施磷 ,使油菜植株氮代谢高峰期推迟 ,氮肥的当季作物利用率提高 2 0 % ,植株磷浓度和吸收量大幅度提高 ,当季作物磷肥的利用率达到 32 %。未施磷条件下 ,中油 1 1 9籽粒产量高于其他常规品种 ,施磷则表现中油 82 1的增产率高于中油 1 1 9、中双 4号等双低品种。生物学产量亦表现同样趋势
In the paddy soils of subtropical red-yellow soil areas, the differences of nitrogen and phosphorus uptake and accumulation and their effects on the biological yield and grain yield of five new double-canola varieties and two conventional rape varieties under different fertilization conditions were studied. The results showed that the nitrogen concentration in plantlets of Zhongyou199 and Zhongshuanshan4 were slightly lower than that of the conventional rapeseed Zhongyou82 1. There was no significant difference in plant P between the two cultivars. In the seedling stage, Shuang 4 and Pei’ai 1 1 9 had higher nitrogen uptake than Pei’ai 82 1 and 831 3, whereas the flowering period was the opposite. There was no significant difference in phosphorus uptake of different cultivars during the early growth period, but lower than the conventional cultivars during the mature stage. The application of phosphorus on the basis of NK delayed the peak period of nitrogen metabolism in rapeseed. The seasonal crop utilization of nitrogen fertilizer increased by 20%, and the phosphorus concentration and absorption of plant increased greatly. The utilization rate of phosphorus fertilizer in the crop reached 32%. Under the condition of no phosphorus applied, the grain yield of Zhongyi 1 1 9 was higher than that of other conventional varieties, while the phosphorus application showed that the yield of Zhongyou 82 1 was higher than that of double-low varieties such as Zhongyou199 and Zhongshuang4. Biological yield also shows the same trend