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International Journal of Biological Chemistry
Year: 2007  |  Volume: 1  |  Issue: 2  |  Page No.: 75 - 83

Uptake of Carbon and Nitrogen Through Rice Root from 13C and 15N Dual-labeled Maize Residue Compost

Azza Ebid, Hideto Ueno, Adel Ghoneim and Naomi Asagi    

Abstract: This study was carried out in 2004 at Ehime University Experimental Farm (Japan) to assess the fate of carbon and nitrogen in paddy soils for rice cultivation by using 13C and 5N dual-labeled Maize Residue Compost (MRC) in comparison with Inorganic Fertilizer (IF) labeled with 10.5 atom% of 15N-NH4Cl. The MRC was applied to the rice (Oryza sativa L. cv. Koshihikari) at the rate of 20.0 Mg ha-1. There were no significant differences between IF and MRC in the growth and yield of rice. Rice took up nitrogen at the rate of 32.4 mg N pot-1, 7.30% from the IF pots and 29.4 mg N pot-1, 6.40% from the MRC pots. Nitrogen recovered from IF and MRC was 9.90 and 6.0% of grain, 25.1 and 16.4% of straw and 5.50 and 4.40% of root, respectively. Nitrogen uptake derived from the soil was significantly higher (p<0.05), in both treatments. Rice root recovered a considerable amount of carbon (3.74%) from applied MRC with 13C concentration being highest in straw (2.44% of applied C) as compared with grain (0.33%) and root (0.97%). Nitrogen loss was higher in the MRC (69.0%) treatment than in the IF treatment (53.0%). The loss of 13C from the MRC treatment stood at 69.0%, while residual 13C was 27.0%. The results demonstrate that rice plant absorbed a significant amount of nitrogen from MRC and carbon uptake through rice roots. It is concluded that the integrated use of MRC with low rates of inorganic fertilizers can sustain rice production and soil fertility.

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