^<15>N DILUTION TECHNIQUE OF ASSESSING THE CONTRIBUTION OF NITROGEN FIXATION TO RICE PLANT
スポンサーリンク
概要
- 論文の詳細を見る
An attempt to correlate the positive nitrogen balance in the rice-soil system with ^<15>N dilution in the rice plant was done to see if isotope dilution can be used to assess the contribution of nitrogen fixation to nitrogen nutrition of rice. ^<15> ammonium sulfate and sucrose were added to the moist soil in pots to label biomass nitrogen fraction, and then the soil was air dried. It was moistened again, and planted to two crops of dryland rice or wetland rice. Dryland rice had lower positive nitrogen balance and much higher ^<15> N content than wetland rice. The rice-soil system with higher nitrogen gain had lower ^<15> content in the rice plant, suggesting inverse relationship of total nitrogen balanced and ^<15>N dilution. When the surface of pots was covered with black cloth, to suppress photodependent N_2 fixation, no significant nitrogen gain was observed after two crops of rice. Significant gains were found in the rice-flooded soil system exposed to light and the ^<15gt;N contents of plants decreased in allowing photodependent N_2 fixation by blue-green algae or Azolla-Anabaena symbiosis. Contribution of plant nitrogen derived from photodependent N_2 fixation was estimated to be 20-30% of the positive nitrogen gain in the system by the ^<15> dilution technique using the rice-covered soil as reference system. Balance data of total nitrogen and ^<15> N enabled the estimation of the gross nitrogen gain in the rice-soil system. ^<15>N dilution technique is useful in assessing the contribution of N_2 fixation to nitrogen nutrition of wetland rice if proper reference system is taken.
- 社団法人日本土壌肥料学会の論文
著者
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Ventura Wilbur
The International Rice Research Institute
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Watanabe Lwao
The International Rice Research Institute
関連論文
- DIFFERENTIAL PHOSPHORUS REQUIREMENTS OF AZOLLA SPECIES AND STRAINS IN PHOSPHORUS-LIMITED CONTINUOUS CULTURE
- NITROGEN-FIXING (C_2H_2-REDUCING) ACTIVITY AND PLANT GROWTH CHARACTERS OF 16 WETLAND RICE VARIETIES
- PLANT ASSOCIATED N_2 FIXATION (C_2H_2-REDUCTION) BY FIVE RICE VARIETIES, AND RELATIONSHIP WITH PLANT GROWTH CHARACTERS AS AFFECTED BY STRAW INCORPORATION
- GROWTH INHIBITION DUE TO CONTINUOUS CROPPING OF DRYLAND RICE AND OTHER CROPS
- MICROBIAL BIOMASS NITROGEN IN ANAEROBIC SOIL AS AFFECTED BY N-IMMOBILIZATION AND N_2-FIXATION
- NITROGEN SUPPLYING ABILITY OF PADDY SOILS UNDER FIELD CONDITIONS IN THE PHILIPPINES
- IMPROVEMENT OF PHOSPHATE FERTILIZER APPLICATION TO Azolla
- DYNAMICS OF AVAILABLE NITROGEN IN PADDY SOILS : I. Changes in Available N during Rice Cultivation and Origin of N
- ^N DILUTION TECHNIQUE OF ASSESSING THE CONTRIBUTION OF NITROGEN FIXATION TO RICE PLANT
- INVOLVEMENT OF NEMATODES IN THE SOIL SICKNESS OF A DRYLAND RICE-BASED CROPPING SYSTEM
- DRY SEASON SOIL CONDITIONS AND SOIL NITROGEN AVAILABILITY TO WET SEASON WETLAND RICE
- NITROGEN FIXATION ASSOCIATED WITH DEEPWATER RICE
- FATE OF NITROGEN FROM A BLUE-GREEN ALGA IN A FLOODED RICE SOIL
- RESPONSE OF WETLAND RICE TO INOCULATION WITH Azospirillum lipoferum AND Pseudomonas SP
- AVAILABILITY TO RICE PLANTS OF NITROGEN FIXED BY Azolla
- RELATIONSHIP BETWEEN SOIL PHOSPHORUS AVAILABILITY AND Azolla GROWTH
- DISTRIBUTION, AND UPTAKE BY RICE PLANTS OF ^N-LABELED AMMONIUM APPLIED IN MUDBALLS IN PADDY SOILS
- Mineralization of Azolla N and Its Availability to Wetland Rice : II. Fertilizer Effect and ^N Uptake by Rice from Different Species of Azolla with Varying N Contents