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采用龙优5号水稻为试材,通过田间试验,研究寒地直播稻与传统移栽稻氮素吸收及产量的差异,探明寒地直播稻的氮素积累规律,为直播稻施肥提供理论依据。结果表明,直播稻抽穗期和灌浆期叶片含氮量分别比移栽稻高10.2%(P<0.05)和10.0%(P<0.05),显著提高了叶片光合能力。成熟期籽粒氮积累量比移栽稻高16.1%(P<0.05),抽穗后氮同化量和氮同化贡献率分别比移栽稻高104.7%(P<0.01)和76.2%(P<0.01),氮肥偏生产力比移栽稻高37.2%(P<0.01)。直播稻穗粒数和千粒重显著提高,结实率也有所增加,产量比移栽稻高8.1%(P<0.05)。
Longyou 5 was used as test material to study the difference of nitrogen uptake and yield between direct seeding rice and traditional transplanting rice through field experiments to find out the rules of nitrogen accumulation in direct seeding rice in cold region and to provide theory for direct seeding rice fertilization in accordance with. The results showed that the leaf nitrogen content in direct seeding rice was 10.2% (P <0.05) and 10.0% (P <0.05) higher than that in transplanted rice at heading and filling stages respectively, which significantly increased the photosynthetic capacity of leaves. The accumulation of nitrogen in mature grain was 16.1% higher than that in transplanted rice (P <0.05), and the contribution of nitrogen assimilation and nitrogen assimilation after heading was 104.7% (P <0.01) and 76.2% (P <0.01) , And the partial productivity of nitrogen fertilizer was 37.2% higher than that of transplanted rice (P <0.01). Direct seeding rice grain number and 1000-grain weight increased significantly, the seed setting rate also increased, the yield was 8.1% higher than the transplanting rice (P <0.05).