THE UPTAKE, DISTRIBUTION, AND ACCUMULATION OF ^<15>N-LABELLED AMMONIUM AND NITRATE NITROGEN TOP-DRESSED AT DIFFERENT GROWTH STAGES OF RICE

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A pot experiment with soil culture was carried out to trace ^<15>N-labelled nitrogen top-dressed at different growth stages of rice. The study involves the use of a modified vacuum system for determining total nitrogen by gas volumetric measurement, and the N_2 gas sampled in the discharge tube was analysed for nitrogen-15 by the optical spectrographic technique. The plants took up more nitrogen from (^<15>NH_4)_2SO_4 than from Na^<15>NO_3,irrespective of the stage of dressing, and the uptake of both forms was much higher when the plants were top-dressed at the young panicle formation stage as compared with the later dressings. At full maturity the plants had the highest accumulation of labelled nitrogen from both ammonium and nitrate sources when they are top-dressed at the young panicle formation stage. More than 80% of the labelled nitrogen taken up by the plants was distributed in the brown rice and this trend was more remarkable when top-dressing was carried out at the milk stage. The distribution patterns of ammonium and nitrate nitrogen were similar in brown rice but differed in leaves and stem. Nitrogen transported from other parts to the panicle was utilized for the booting stage, and then for brown rice development. With the completeness of husk formation, at the milk stage, nitrogen transported to the grain might have been utilized for brown rice development more rapidly. In the brown rice, nitrogen from ammonium was translocated maximally to the inner part of the endosperm from dressing at the booting stage, and to the embryo from that at the milk stage, whereas that from nitrate was translocated maximally to the embryo from the dressings at both stages.
一般社団法人日本土壌肥料学会の論文

THE UPTAKE, DISTRIBUTION, AND ACCUMULATION OF ^<15>N-LABELLED AMMONIUM AND NITRATE NITROGEN TOP-DRESSED AT DIFFERENT GROWTH STAGES OF RICE

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