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以选育时期不同(两个选育时代)的12个水稻品种为材料,于施氮量为0,225,300 kg/hm2纯氮大田条件下,研究了不同氮肥水平下两选育时代的水稻品种产量、物质生产积累量及氮素吸收、利用效率的差异。结果表明,水稻产量随着选育时代的更替有所提高,并随施氮量的增加两时代产量表现不同,早期品种中有83.3%的水稻基因型的产量随施氮量增加呈增加趋势,当代品种产量则有一半基因型在225 kg/hm2氮肥水平下产量达最大,说明早期品种对氮肥反应较当代品种敏感。农艺性状中的株高和穗长随着育种时代的更替有矮化和减小的趋势,着粒密度有所增加。干物质和氮素平均积累量在生育时期各阶段均表现为当代品种大于早期品种,氮素利用效率亦表现相同的规律。相关分析表明,水稻产量与抽穗、成熟期物质积累量和氮素吸收量均呈显著或极显著正相关关系,与拔节期关系不密切。氮素利用效率与产量呈显著正相关,与株高和穗长呈显著负相关。说明随着选育时代的更替,水稻产量、吸氮量及氮素利用效率有所提高,株型趋于矮化,穗型由散穗向密穗型演变。
Using 12 rice cultivars with different breeding ages (two breeding ages) as materials, the yield of rice varieties in two breeding periods under different nitrogen fertilizer rates were studied under nitrogen fertilizer conditions of 0,225,300 kg / hm 2 nitrogen field. The accumulation of material production and the difference of nitrogen absorption and utilization efficiency. The results showed that the yield of rice increased with the growth of breeding age. With the increase of N application rate, the yield of rice in two generations was different. The yield of 83.3% of the early rice genotypes increased with the increase of N rate, Half of the contemporary genotypes produced the highest yield at the nitrogen level of 225 kg / hm2, indicating that the early varieties were more sensitive to nitrogen than their contemporary counterparts. The plant height and spike length in agronomic traits tended to dwarf and decrease with the breeding age, and the grain density increased. The average accumulation of dry matter and nitrogen in all stages of growth period showed that the contemporary varieties were more than the early varieties, and the nitrogen use efficiency also showed the same rule. Correlation analysis showed that there was a significant or very significant positive correlation between rice yield and heading, maturity accumulation and nitrogen uptake, but not with jointing stage. Nitrogen use efficiency and yield were significantly and positively correlated with plant height and spike length was significantly negatively correlated. The results showed that with the change of breeding age, the rice yield, nitrogen uptake and nitrogen use efficiency increased, plant type dwarfed, panicle to spike panicle evolution.