Soil-plant nutrition studies on tropical rice. III. The effect of soil fertility status of nitrogen and its liberation upon the nitrogen utilization by the rice plants in Bangken paddy soil

Koyama, T.

Soil Science and Plant Nutrition 17(6): 210-220


ISSN/ISBN: 0038-0768
Accession: 000195189

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In field experiments with 15N on soil of high clay content, native soil N comprised 63-88% of the total N content of rice plants at harvest time; it originated mainly from N liberated in the early and middle stages of growth. Since the plant's capacity for N uptake differed little between early and later stages of growth, the difference in soil N utilization between the two growth phases was attributable to differences in the temperature-controlled release pattern of soil N.[318:221.17:116.17.012].