Path Analysis of Phosphorus Retention Capacity in Allophanic and Non-allophanic Andisols

Abstract

All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher. Path Analysis of Phosphorus Retention Capacity in Allophanic and Non-allophanic AndisolsSoil Chemistry P hosphorus retention capacity is an important property controlling the release of P from soil to surface water. Phosphorus retention in acidic soils is primarily regulated by Al and Fe in clay minerals (Kang et al., 2009;Zhang et al., 2005). Both Al and Fe minerals are abundant in volcanic ash soils that are characterized by a high PRC (Shoji and Ono, 1978;Wada and Gunjigake, 1979). To understand P retention behavior in soils, the chemical fractionation of Al and Fe is more critical than the total amount existing in the soil. Hiradate and Uchida (2004) grouped the chemical forms of Al and Fe into (i) humus complexes, (ii) non-and poorly crystalline metal hydroxides (e.g., allophane and ferrihydrite), (iii) crystalline metal (hydr)oxides (e.g., gibbsite and goethite), and (iv) stable minerals (e.g., phyllosilicates). Non-and poorly crystalline Al and Fe hydroxides, which can selectively be extracted by acid ammonium oxalate solution (Al ox and Fe ox ), are known to be the major P sorbent in noncalcareous soils (McKeague and Day, 1966;Schoumans, 2000). Th e fractions of Al p and Fe p represent metal-humus

Zinc fertilizer placement affects zinc content in maize plant

“…Regression models were used to evaluate the response using SigmaPlot (Systat software, USA). Correlation studies and decomposition of coefficient between shoot Zn content and root characteristics by path analysis (to describe the directed dependencies among a set of variables, Hashimoto et al 2012) were carried out using SAS software.…”

Evaluating Status Change of Soil Potassium from Path Model

“…We measured 33 parameters of the different attributes of 256 soil samples. Those parameters were selected based on standards of Hashimoto and Kang research methods of phosphorus[19], [31]. Humic acid (NHA) in soil which can be extracted by NaOH solution (0.1 mol·L −1 , pH = 3), humic acid (PHA) in soil which can be extracted by Na 2 P 2 O 4 solution (0.05 mol·L −1 , pH = 9.2), humus linked to iron (HMi) and humic linked to clay (HMc).…”

“…Path analysis is a statistical technique that distinguishes coefficient and causation by partitioning coefficients into direct and indirect effects. Researchers used path analysis to analysis phosphorus retention capacity in allophanic and non-allophanic andisols and soil organic matter effects on phosphorus sorption is successful [19], [20]. The method of path coefficients, which was proposed by Wright (1921), was effective in disclosing relationships between variables by diagrams [21]–[25].…”

Peer Review #3 of "Phosphate sorption and desorption by two contrasting volcanic soils of equatorial Africa (v0.1)"

“…Volcanic soils have been extensively studied in the world, particularly with respect to phosphorus adsorption (Van Ranst et al, 2004;Auxtero et al, 2008;Hashimoto et al, 2012;Valle et al, 2015), but there is a dearth of information on volcanic soils in Africa. A number of published papers address the phosphate sorption by African soils (Sibanda and Young, 1986;Loganathan et al, 1987;Frossard et al, 1992;Adepoju, 1993;Arduino et al, 1993;Adetjuni, 1997;Henry and Smith, 2003;Nwoke et al, 2003;Gichangi et al, 2008).…”