Nitrogen nutrition and growth of the rice plant

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Abstract
The dynamics of nitrogen in rice seedlings was discussed and the following were concluded. (1) The nitrogen source to make up new leaves comes not only from the root (medium nutrient) but also from old leaves. (2) Nitrogen balance in a mature leaf is controlled by the influx and efflux of nitrogen. (3) Amino acids move out from a leaf partly before incorporating into proteins, and partly after incorporating into proteins and their subsequent breakdown. (4) Re-transferred nitrogen is transported mainly to young leaves and roots with very little going to old organs.