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土壤圈(英文版). 1995, (04)

Nitrogen Status and Utilization in Rhizosphere of RiceEnglish Full Text

HUANG JIAN-GUO and YUAN LING(INRA, Microbiologie, Centre de Nancy, 54280 Champenoux)(France)(Dept of Soil Science, Southwest Agric. Univ., Chongqing 630716)(China) )

Abstract: A greenhouse pot experiment was conducted with hybrid rice （Ocyza Sativa L.） in order to stndy Nstatus and utilization in the rhizosphere of rice. The experiment was composed of three treatments: withoutN, ￣（15）NH4- N and ￣（15） NO3- N. Plant roots were separated from the soil by a nylon cloth, and 1 mm incrementsof soil, moving laterally away from the roots, were taken and analyzed for various N froms. The labelled Nin the plants ranged from 67.51% to 69.24% of the total amount of N absorbed by the rice seedlings withthe labelled fertilizer N treatments. This shows that the N in the plants came mainly from the fertilizers.However, the N absorbed by the rice seedlings accounted for less than 35% of the total amount of the Ndepletion in the soil near the rice roots, indicating an important N loss in the rhizosphere of rice. The soilredox potential （all treatments） and the concentration of the labelled NO3-N (the labelled NH4-</sub>N treatmentonly) decreased as the distance from the rice roots increased in the rhizosphere of rice. In contrast, theconcentration of the labelled NH4- N increased a.s the distance increased in the same soil zone. These resultssuggested that nitrification occurred in the soil around the rice roots. Therefore, the reason for the N lossin the rhizosphere of rice might be the NO3 movement into the reductive non-rhizosphere soil （submerged）where denitrification can take place.
Keywords：

nitrification; nitrogen; rhizosphere; rice;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S158.3

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