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缓释氮肥对油菜产量及氮素利用的影响

Effects of Slow-release Nitrogen Fertilizer on Yield and Nitrogen Use of Rape

  • 摘要: 过量及不合理使用化肥不仅会带来农业面源污染,而且会影响土壤结构。为探索化肥减施增效有效路径,实现农业可持续发展,以安徽省农业科学院作物研究所选育的、陕西荣华农业科技有限公司生产的沣油737号油菜品种为研究对象,通过2种不同的施肥方式观察油菜植株的农艺性状、产量构成、产量及氮素利用情况。设一种施肥方式K1为尿素(含氮量为46%)、重过磷酸钙(含五氧化二磷量为40%)和硫酸钾(含氧化钾量为55%)混合肥;另一种施肥方式K2为沃夫特硝基双效缓释肥(含氮、磷、钾养分分别为25%、14%、7%)。结果表明,与CK(对照)相比,K1和K2的油菜植株株高、千粒质量、籽粒产量、秸秆产量、油菜籽氮含量、秸秆含量和氮累积吸收率等各指标均显著增加(P<0.05);K2与K1相比,K2株高、千粒质量、籽粒产量和秸秆产量、氮吸利用率和氮肥农学利用率也显著增加(P<0.05)。说明缓释氮肥能在土壤中缓慢释放氮元素,满足油菜在不同生长期对养分的需求,从而减少了肥料的淋溶损失,增加了植株产量和氮素利用率。

     

    Abstract: Excessive and irrational use of chemical fertilizers will not only bring about agricultural non-point source pollution, but also affect soil structure. In order to explore the effective way of reducing fertilizer application and increasing efficiency, and realize the sustainable development of agriculture, the rape variety Fengyou No.737, which was bred by the Crop Research Institute of Anhui Academy of Agricultural Sciences and produced by Shaanxi Ronghua Agricultural Technology Co., Ltd., was taken as the research object. The agronomic traits, yield composition, yield and nitrogen utilization of rape plants were observed through two different fertilization methods. A fertilization method K1 is a mixture of urea(46% nitrogen content), heavy superphosphate(40% phosphorus pentoxide content) and potassium sulfate(55% potassium oxide content). Another type of fertilizer, K2, is Wolft nitro dual-effect slow-release fertilizer(containing 25% nitrogen, 14% phosphorus and 7% potassium nutrients, respectively). The results showed that compared with CK(control), the plant height, thousand grain weight, grain yield, straw yield, rapeseed nitrogen content, straw content and cumulative nitrogen absorption rate of K1and K2were significantly increased(P<0.05). Compared with K1, K2plant height, thousand grain weight, grain yield and straw yield, nitrogen uptake efficiency and nitrogen fertilizer agronomic efficiency were also significantly increased(P<0.05). These results indicated that slow-release N could release N slowly from the soil to meet the nutrient requirements of rapeseed at different growth stages, thus reducing the leaching loss of fertilizer and increasing plant yield and nitrogen use efficiency.

     

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