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Long-Term Cropping Effect on Phosphorus Fractions in an Ultisol of the Humid Forest Zone in West Africa

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Relation http://oar.icrisat.org/4877/
http://dx.doi.org/10.1081/CSS-120017830
 
Title Long-Term Cropping Effect on Phosphorus Fractions in an Ultisol of the Humid Forest Zone in West Africa
 
Creator Abekoe, M K
Sahrawat, K L
 
Subject Soil Science
Fertilizer Appications
 
Description The nature of phosphorus (P) pools in soils after application of P fertilizers should be considered when designing management practices to raise P fertility. Five rates of P: 0(P0), 45(P45), 90(P90), 135(P135) and 180(P180) kg ha−1 in the form of triple superphosphate (TSP) were applied once in 1993 on a Typic Paleudult at Man in Côte d'Iviore and the soil was cropped successively for five years (i.e., up to 1998) with four upland rice cultivators. At the end of the cropping season in 1998, soil samples were collected from the various P treated plots and the following P fractions were analyzed: resin-P, NaHCO3-Pi, NaOH-Pi, HCl-P residual P and organic P. The P fractions were compared with those of stored soil samples collected in the field before the initiation of the experiment in 1993. Five years of cropping the soil reduced labile Pi (resin-P+NaHCO3-Pi) from 10.8 mg P kg−1 in the uncultivated soil to 7.62 mg P kg−1 in the control (P0) and to 9.71 mg kg−1 in the P45 treatment. Labile Pi in P90 was the same (10.7 mg P kg−1) as in the uncultivated soil but in the P135 and P180 soils, labile Pi increased by 1.3 and 2.7 mg P kg−1 above that of the uncultivated one. The NaOH-Pi and residual P fractions of lower availability increased with increasing rates of P application. The results suggested that on the Ultisol studied, P applied once to a field, cropped successively over a period of time was not an adequate management option. Frequent P application at low rates at each cropping season is suggested and merits investigation on the Ultisol studied.
 
Publisher Taylor & Francis
 
Date 2003
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/4877/1/Long-term%20cropping%20effect%20on%20phosphorus%20fractions.pdf
Abekoe, M K and Sahrawat, K L (2003) Long-Term Cropping Effect on Phosphorus Fractions in an Ultisol of the Humid Forest Zone in West Africa. Communications in Soil Science and Plant Analysis, 34 (3 & 4). pp. 427-437. ISSN 0010-3624