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用同位素~(15)N标记尿素示踪方法的试验结果表明:(1)稻田地力高低对植株体内氮素来源的比率影响不明显,但地力高供氮能力强,可以同时提高植株对地力氮和化学氮的吸收。(2)水稻在幼穗分化前后至齐穗阶段,对地力氮吸收比率明显降低,其所需氮素多依赖于化学氮的供应。(3)水稻植后14天内吸收的氮素以地力氮为主。不良天气会影响植株对氮的吸收,对化学氮吸收的影响尤为明显。(4)稻株体内积累的氮素以地力氮为主,在茎叶的比率高于穗部,积累的化学氮比率,穗部高于茎叶。
The results of isotope labeled urea tracer experiment show that: (1) The effect of paddy field fertility on the ratio of nitrogen sources in plants is not obvious, but the ability of high fertility for nitrogen fertilization can improve both the soil available nitrogen And chemical nitrogen absorption. (2) Before and after panicle differentiation, rice had a significantly lower rate of soil nitrogen absorption, and its nitrogen requirement was more dependent on the supply of chemical nitrogen. (3) Nitrogen absorbed by rice in the 14 days after planting was dominated by soil fertility nitrogen. Bad weather will affect plant nitrogen uptake, the impact of chemical nitrogen absorption is particularly evident. (4) Nitrogen accumulation in rice plants was dominated by soil fertility nitrogen, and the ratio of stem to leaf was higher than that of the panicle, and the rate of chemical nitrogen accumulation was higher than that of the stems and leaves.