Phosphate in Malaysian Ultisols and Oxidols As Evaluated By a Mechanistic Model

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Date
1985
Authors
Bidin,A.A
Barber,S.A
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Abstract
Mechanistic mathematical models have been used to describe P uptake by crops growing on Alfisols and Mollisols. The predicted uptake has agreed closely with observed uptake. The objective of this research was to determine if the model would predict P uptake by sorghum (Sorghum bicolor L.) and carrot (Daucus carota L.) from Malaysian Ultisols and Oxisols. These soils were very low in available P . and fixed large amounts of added P. Experiments were conducted with six Malaysian soils and one Mollisol from Indiana in pot experiments with sorghum and carrot in a controlled-climate chamber. The mathematical model predicted p' uptake that closely agreed with observed uptake when root hairs as well as roots were used in the calculation, indicating that the model was satisfactory for use with Ultisols and Oxisols. The results indicated that root hairs were relatively more important for P uptake from Oxisols and Ultisols than from a Mollisol.
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Soil Survey Horizons, 139 (No 6), p. 500-504