氮肥施用量对不同粳稻品种产量及生理特性的影响

为了研究水稻高产高效栽培，通过对水稻的生理指标的测定和水稻穗部性状及产量的调查，研究4个氮素水平对3个粳稻品种（‘沈农315’，‘沈稻7号’以及‘沈稻11’）产量及生理特性的影响。结果表明，随着施氮量的增加，各品种的叶面积指数均呈增加的趋势。高氮处理穗长较长，一次枝梗数和二次枝梗数较多。‘沈农315’和‘沈稻7号’在高氮肥处理下产量最高，分别达到9.78 t/hm2和9.65 t/hm2。其次为‘沈稻11’高氮、‘沈农315’中氮、‘沈稻11’中氮及‘沈稻7号’中氮处理，产量依次为9.21 t/hm2、9.11 t/hm2、8.60 t/hm2、8.49 t/hm2。

Effect of Nitrogen Amount on Yield and Physiological Characteristics of Japonica Rice Varieties

Through the investigation of physiological characteristics and panicle traits, an experiment was carried out to study the effect of nitrogen amount in four levels on physiological characteristics and the yield of three japonica rice varieties,‘Shennong 315’,‘Shendao 7’and‘Shendao 11’. The results showed that, with the increasing of nitrogen amount, the leaf area index increased. The panicle length, the primary and secondary rachis-branches at high nitrogen level were more than those of other nitrogen levels. The yield of‘Shennong 315’and‘Shendao 7’were higher, and reached 9.78 t/hm2 and 9.65 t/hm2, respectively, followed by‘Shendao 11’in the high level,‘Shennong 315’,‘Shendao 11’and‘Shendao 7’in middle level, the yield was 9.21, 9.11, 8.60, 8.49 t/hm2, respectively.