太湖地区单季晚稻产量-氮肥施用量反应曲线的历史比较

本文对19821~985年和20042~006年在太湖地区进行的两次水稻产量-化肥氮施用量的田间试验网中获得的大量结果进行了对比分析。结果表明,与80年代初相比,当前的水稻产量-施氮量的反应曲线明显上移,在氮肥用量相同的情况下,化肥氮的表观利用率和增产效果明显增高,这可能与水稻栽培品种的产量潜力和吸收效率的提高,以及氮肥施用技术的改进有关。因此,在高产、高施氮量地区,培育产量潜力更高、吸收能力更强和对氮肥反应更大的品种,并结合栽培技术(包括氮肥施用技术)的改进,是进一步增加施氮量以提高产量、协调高产与环保的重要基础。

Historical comparison on the response curves of rice yieldnitrogen application rate in Tai Lake Region

The rice yield-nitrogen(N) application rate response curve obtained from the network of field experiments conducted in 2004-2006 is compared with that conducted in 1982-1985.Results show that in comparison with the response curve obtained in 1982-1985,the response curve obtained in 2004-2006 is at a markedly higher position at the Y-axis,the agronomic efficiency and the apparent plant recovery of fertilizer N are improved considerably.Presumably,these are primarily,in addition to the improvement in the appl...