TY  - JOUR
AV  - restricted
A1  - Abekoe, M K
A1  - Sahrawat, K L
TI  - Phosphate retention and extractability in soils of the humid zone in West Africa
UR  - http://dx.doi.org/10.1016/S0016-7061(00)00110-5 
JF  - Geoderma
SN  - 0016-7061
PB  - Elsevier
N1  - M.K. Abekoe thanks the West Africa Rice Development Association
?WARDA.for the award of a Visiting Scientist fellowship and support of the
study. The help offered by the technical staff of the Soil Science Division of
WARDA in the course of the analytical work is very much appreciated
N2  - Phosphate adsorption and desorption studies provide insight for developing P management strategies. Very few studies have concentrated on P desorption which provides information on the reversibility of adsorbed P. Phosphate adsorption and desorption studies were carried out on seven rice-growing soils from three countries in West Africa, with the objective of relating these processes to P management strategies for the soils. The standard P requirement (SPR) of soils, defined as the amount of P to be added to attain an equilibrium solution concentration of 0.2 mg P l?1, varied from 42 to 175 mg P kg?1. Out of the seven soils, four required low amounts and the other three needed relatively higher P applications. The extractability of the adsorbed P in different extractants was: 0.01 M KCl 32?78%, Olsen P 21?112%, and Bray 1 P 15?40%. Differences in the amounts of P desorbed by the soils suggested that the critical P levels needed for P management must be different. Management options to increase P availability in the soils are suggested.


KW  - Phosphorus; Adsorption; Desorption; Extractability of P; Soils; Humid zone


Y1  - 2001///
SP  - 175
ID  - icrisat4000
EP  - 187
VL  - 102
IS  - 1-2
ER  -