Effects of various environmental and medium conditions on the response of oryza sativa ssp indica and oryza sativa ssp japonica plants to ammonium and nitrate nitrogen

T.T.C.; Ohira, K.

Soil Science and Plant Nutrition 27(3): 347-356


ISSN/ISBN: 0038-0768
Accession: 005332805

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The responses of 2 ssp. of rice, O. sativa ssp. indica [Indica] and O. sativa ssp.japonica, [Japonica] to NH4+ and NO3- under various environmental and medium conditions were studied by the water culture method. Different effects of seasonal variations, particularly of temperature and light intensity, on the responses of both subspecies to NH4+ and NO3-, were indicated. In summer, when the temperature and light intensity were high, the Indica rice plant fed with NO3- was definitely superior to that fed with NH4+ or NH4+ + NO3-, while the Japonica showed a better response to NH4+ + NO3- than to NH4+ or NO3-. As the season progressed to autumn, the response of the Indica rice plant to NH4+ and NO3- followed the same trend as that of the Japonica. In contrast, the growth of both subspecies fed with NH4+ relative to that of plants grown in NH4+ + NO3- was better in autumn than in summer. Although the responses of both subspecies to NH4+ and NO3+ were also influenced by the medium pH, and the ratio of NH4+ to NO3- in the culture solution Indica always showed a better growth with NO3- than Japonica. The uptake of NH4+ and NO3- by both subspecies exhibited the same trend as the growth response.