论文部分内容阅读
以氮肥群体最高生产力的定义为基础,在各基因型最适氮肥水平下,研究了低、中、高3种氮肥群体最高生产力类型粳稻品种的产量结构及其氮素吸收利用特性。结果表明,随着氮肥群体最高生产力递增,总颖花量不断增加,而结实率和千粒重变化不明显。随着氮肥群体最高生产力递增,够苗期、抽穗期和成熟期的氮素积累量逐渐增加,而拔节期无显著差异。各阶段氮素积累量,除够苗至拔节阶段外,其余各阶段均随着氮肥群体最高生产力递增而逐渐增加。与低氮肥群体最高生产力类型相比,中等氮肥群体最高生产力类型氮素转移量和转移率显著增加,而高氮肥群体最高生产力类型氮素转移能力较中等类型相比无显著提高。较之中、低生产力类型,高生产力类型水稻品种具有够苗前氮素积累快,够苗至拔节积累少,拔节至抽穗积累稳,抽穗至成熟积累多,且抽穗后氮素向籽粒转移量大但不过量的特点。
Based on the definition of highest productivity of nitrogenous fertilizer group, the yield structure and nitrogen absorption and utilization characteristics of the highest productivity type japonica rice varieties with low, medium and high nitrogenous fertilizers were studied under the optimum nitrogen level of each genotype. The results showed that with the increment of maximum productivity of nitrogenous fertilizer, the total amount of spike increased continuously, but the seed setting rate and thousand-grain weight did not change obviously. With the increment of maximum productivity of nitrogenous fertilizer group, nitrogen accumulation in seedling stage, heading stage and mature stage increased gradually, but no significant difference in jointing stage. The nitrogen accumulation in all stages increased gradually with the increase of maximum productivity of nitrogenous fertilizers except for seedlings to jointing stage. Compared with the highest productivity type of low N fertilizer group, the N transfer rate and transfer rate of the highest productivity type of medium N fertilizer group increased significantly, while the highest N productivity of N fertilizer group had no significant increase compared with the middle type. In contrast, low-productivity and high-productivity rice cultivars had the characteristics of rapid accumulation of nitrogen before seedling emergence, less seedling to jointing accumulation, steady accumulation from jointing to heading, more heading to maturity accumulation, and the transfer of nitrogen to grain after heading Large but not excessive features.