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Sorption of labelled phosphate by a vertisol and an alfisol of the semi-arid zone of India

OAR@ICRISAT

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Relation http://oar.icrisat.org/3973/
http://dx.doi.org/10.1007/BF01055397
 
Title Sorption of labelled phosphate by a vertisol and an alfisol of the semi-arid zone of India
 
Creator Sahrawat, K L
Warren, G P
 
Subject Soil Science
 
Description Adsorption isotherms for total adsorbed phosphate and isotopically exchangeable phosphate were measured for typical examples of a Vertisol and an Alfisol, occurring in close proximity at the ICRISAT centre. For each soil, the relationships of exchangeable P and total adsorbed P with phosphate solution concentration were described well by the Freundlich isotherm. Neither of the soils adsorbed significant amounts of P in a non-exchangeable form. The Vertisol had a higher capacity and buffer power for phosphate sorption, implying a lower response to fertilizer P. However, all adsorbed P remained in forms labile to 32P, equilibrated for 22 h, so that for equal amounts of CaCl2 extractable P there was more labile P in the Vertisol. In the absence of added P, the data suggested that the Vertisol maintained a greater level of dissolved and labile P. These observations are in accord with the results of field experiments, where larger applications of P may be required in Vertisols, compared with Alfisols, to achieve the same yield response, but that P is more freely available crops grown in Vertisols than is suggested by chemical extraction methods for available P
 
Publisher Kluwer Academic Publishers
 
Date 1989
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/3973/1/FertilizerRes_20_1_17-25_1989.pdf
Sahrawat, K L and Warren, G P (1989) Sorption of labelled phosphate by a vertisol and an alfisol of the semi-arid zone of India. Fertilizer Research, 20 (1). pp. 17-25. ISSN 0167-1731