不同熟期杂交晚稻的氮素吸收特性与产量形成的研究

研究了在不同施氮水平下,不同熟期杂交晚稻的吸氮特性与产量形成的关系:早熟组合威优64的每亩平均总吸氮量为9.310千克,迟熟组合汕优63为10.292千克。汕优63比威优64多吸0.982千克,差异主要在于秧田期,大田吸氮量两组合仅相差0.1千克。大田各生育阶段的吸氮量,前期威优64多于汕优63,中期少于汕优63,后期相差甚微。统计分析表明:汕优63和威优64每亩最高产量吸氮量分别为10.243千克和10.847千克,每亩最高产量的穗数分别为18.12万和28.73万。本文最后讨论了不同熟期组合的施氮量,施氮技术及品种生育期与产量的关系。

Studies on the Characteristics of Nitrogen Absorption and the Yield Formation of Late Hybrid Rice With Different Growth Duration

The relationship between the characteristics of nitrogen (N) absorption and the yield formation in late hybrid combinations with different growth duration was studied under different N levels. The main results abtaincd arc summarized as follows. The total amount of N absorption per mu was 9.310kg for wciyou 64, a combination with a shorter growth duarlion, and 10.292kg for shan you 63 with a longer one. The former was 0.982kg more than the later absorbed, which was carried out primarily in the nursery stage, while during field stages shanyou 63 absorbed only 0.1kg more than wciyou 64 did. At the early field stage, wciyou 64 had a bigger amount of N absorption than Shanyou 63, but a smaller one at the middle stage. However, there was no significant difference found at the late stage. The statistic analysis indicated that the amount of N absorption in shanyou 63 and wciyou 64 with the highest yield were 10.243kg and 10.847kg , respectively; the panicle number were 181.200 and 287,300, correspondingly. In the end, the amount of N applied and the applied technique for hybrid combinations with different growth duration and the relationship between duration and yield were discussed.