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Articles by N. Matsue
Total Records ( 3 ) for N. Matsue
  M. Abdalla Elsheikh , N. Matsue and T. Henmi
  Allophane is a soil clay constituent with high adsorption capacity for cationic and anionic solutes and the adsorption characteristics depend on its Si/Al molar ratio. Adsorption experiments of phosphate and oxalate on two natural allophane samples with low (0.67; KyP) and high (0.99; KnP) Si/Al ratios were conducted at initial adsorbate concentration of up to 0.6 mM and at pH of 5.0 to 7.0. In both single and binary (equimolar phosphate and oxalate) adsorbates systems, KnP had less capacity for adsorption of both phosphate and oxalate than KyP had, because in the structure of KnP, accessory Si is already adsorbed onto aluminol groups to which phosphate and oxalate will be adsorbed. For KyP with lower Si/Al ratio and higher adsorption capacity, the efficiency of phosphate to depress the adsorption of coexisting oxalate, EOXâ†?P, was always greater than the reverse efficiency, EPâ†?OX, at a same condition; the ratio of oxalate/phosphate adsorbed in the binary system was less than unity and the ratio decreased with increasing pH and initial adsorbate concentration. These indicated higher selectivity of KyP for phosphate than for oxalate and the selectivity increased with increasing the competition between phosphate and oxalate toward KyP. KnP with higher Si/Al ratio showed higher selectivity for phosphate than KyP did, but the ratio of oxalate/phosphate adsorbed was almost constant when pH and initial adsorbate concentration were raised. This means that even under the lowest pH and the lowest adsorbate concentration examined (pH 5.0, 80 μM), the competition between phosphate and oxalate toward KnP was already severe and further increase in the phosphate selectivity was not caused.
  M. Abdalla Elsheikh , N. Matsue and T. Henmi
  .
  H. Khan , A.Z. Khan , R. Khan , N. Matsue and T. Henmi
  The objective of the present study was to quantify the effects of zeolite application and allophanic soil (KyP and KnP) on leaf area development, plant height and reproductive morphology of soybean. One determinate (Enrei [MG] 1V) and indeterminate cultivar (Harosoy [MG] 11) were planted in pots on April 20th at the Faculty of Agriculture, Ehime University, Matsuyama Japan during 2007. Zeolite levels of 0, 1 and 2 wt.% were used to determine the growth behavior of soybean cultivars grown on two allophanic (KyP and KnP) and a paddy soil. Zeolite application and allophanic soil significantly affected leaf area development, plant height and reproductive morphology of soybean cultivars. Maximum leaf area and plant height were obtained from 2 wt.% zeolite application and allophanic soil (KyP and KnP). Minimum number of days to flowering, pod formation, seed filling duration and physiological maturity were taken by 1 and 2 wt.% zeolite application in both cultivars. The same trend was observed in number of days to reproductive development by KyP and KnP allophanic soil. Enrei took maximum days to all reproductive stages as compared to Harosoy. Zeolite treated plots and allophanic soil (KyP and KnP) attained more plant height than control plots grown on paddy soil without zeolite application. Harosoy produced the tallest plants than Enrei. Present findings supported the results of experiments by demonstrating that zeolite application at planting time promotes leaf area, plant height and encourage the reproductive morphology of soybean cultivars grown on KyP and KnP allophanic soil.
 
 
 
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