Section 3
Chapter 2,656

Mineralization of soil nitrogen and nitrogen absorption by rice plants derived from soil and from irrigation water in paddy fields with continuous application of rice straw compost

Takahashi, S.; Yamamuro, S.

Japanese Journal of Soil Science and Plant Nutrition 63(5): 505-510


Accession: 002655310

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In field experiments at Chugoku National Agricultural Experiment Station rice straw compost was applied at 0, 2 or 5 t/ha each year for 24 years. The rate of N mineralization and the amount of N taken up by rice plants increased with straw application rate. The amount of N mineralized between 27 June and 5 Sep. in plots given 2 and 5 tons straw/ha were 43 and 94% more, respectively, than that of the plots with no straw applied. The amount of N taken up by the plants gradually increased and reached the maximum level between 18 and 25 July, after which it gradually decreased. The amount of N absorbed from soil between 27 June and 29 Aug. in plots given 0, 2 and 5 t straw/ha was 3.49, 6.11 and 7.49 g/msuperscript 2, respectively.