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用(15)~N 标记尿素示踪的方法,对杂交稻汕优2号、汕优6号,常规稻桂朝2号的吸氮特点进行了研究。结果表明:两类型品种在早、晚造前期氮肥的吸收量、利用率都低,而中、后期都显著提高。氮肥利用率:早造常规稻略高于杂交稻,晚造杂交稻略高于常规稻。不论早、晚造,两者的氮肥利用率及吸氮速度,生育前期差异较大,而中、后期差异较小。两者吸收的氮70%以上输送到穗部,尤以常规稻桂朝2号比例较高。
The nitrogen uptake characteristics of hybrid rice Shanyou 2, Shanyou 6 and conventional rice Guizhao 2 were studied by (15) ~ N labeling of urea tracer. The results showed that the uptake rate and utilization rate of nitrogen fertilizer of the two types of cultivars were lower in the early and late stages, but increased significantly in the middle and later stages. Nitrogen utilization rate: Early made conventional rice slightly higher than hybrid rice, late hybrid rice slightly higher than the conventional rice. Regardless of the early and late made, both nitrogen utilization efficiency and nitrogen absorption rate, the greater difference in early growth, while the late difference is small. More than 70% of the nitrogen absorbed by the two is delivered to the ear, especially the conventional rice with a higher proportion of Gui Chao 2.