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Articles by Naomi Asagi
Total Records ( 2 ) for Naomi Asagi
  Azza Ebid , Hideto Ueno , Adel Ghoneim and Naomi Asagi
  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.
  Naomi Asagi , Hideto Ueno and Azza Ebid
  The effects of the application of sewage sludge (SS) on the growth indices, yield and nutrient uptake in rice (Oryza sativa L. cv. Koshihikari) grown in a low fertility soil were investigated and were compared with the effects of the application of chemical fertilizer (CF) and no fertilizer (NF). The application of SS increased plant growth indices in comparison with the NF treatment; however, at harvest, the dry weight of the plants grown in the SS-treated soil was 30% lower than that of plants in the CF-treated soil. The amounts of N uptake by rice from CF, SS and the soil were determined using the A value method. The amounts of N uptake from the fertilizer and soil in the CF treatment were 0.137 and 0.054 g pot-1, respectively and those in the SS treatment were 0.130 and 0.017 g pot-1, respectively. The N use efficiencies of the plants in the CF- and SS-treated soils were 68.3 and 43.0%, respectively. Therefore, the relative efficiency of SS to CF was 62.9%. In comparison to the NF and CF treatments, the application of SS increased the soil microbial activity; this was determined by assaying the fluorescein diacetate esterase activity. At harvest, the pH of the SS-treated soil was higher than that of the soils in the NF and CF treatments and the electrical conductivity (EC) of the CF-treated soil was higher than that of the soils in the NF and SS treatments.
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