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以两系杂交稻品种广两优676为材料,研究不同施氮量对杂交水稻干物质生产的影响。结果表明,增施氮肥,叶片的SPAD值维持较高的水平;叶面积指数(LAI)随施氮水平的增加而提高;在移栽至栽后30d,群体生长率(CGR)与施氮量呈线性正相关,此后则与施氮量呈抛物线型相关,且均以施氮量为20g·m-2的处理为最高。总干物质生产量与施氮量的关系,在栽后30d、拔节期呈直线型正相关,而在齐穗期、成熟期则呈先增后减的抛物线型关系;稻谷产量与前期的干物质积累量的关系不密切,而与中、后期干物质积累量呈显著、极显著的正相关。茎叶中贮积的碳水化合物约20%~30%在齐穗后输出到稻穗,构成稻谷产量的21.9%~31.3%。
Two-line hybrid rice variety, Guangliangyou 676, was used to study the effects of different nitrogen rates on dry matter production of hybrid rice. The results showed that the SPAD value of leaf remained at a high level with increasing N fertilizer. Leaf area index (LAI) increased with the increase of N application rate. At 30 days after transplanting to transplanting, the population growth rate (CGR) There was a linear positive correlation between the nitrogen application rate and the nitrogen application rate, which was parabolic correlation with N application rate. The highest N application rate was 20 g · m-2. The relationship between total dry matter production and nitrogen application rate was linearly positive at jointing stage 30 days after planting and parabolic relationship first increasing and then decreasing at heading stage and maturity stage. The relationship between the amount of material accumulation is not close, but with the dry matter accumulation in the medium and late was a significant, very significant positive correlation. Approximately 20-30% of the carbohydrates stored in the stems and leaves are output to the ears of rice after heading and constitute 21.9% -31.3% of the yield of the paddy.