An assessment of indices of available phosphate in tropical basaltic soils using 32 P
| MSI99P0572 | |
| Wong You Cheong, Y. Mc Conaghy, S. | |
| An assessment of indices of available phosphate in tropical basaltic soils using 32 P | |
| Periodical article | |
| 1972 | |
| Trop. Agric. (Trinidad) | |
| 49: 81-87 | |
| EN | |
| En | |
| Experiments are described in which three Mauritius soils (representing Latosolic Reddish Prairie, Low Humic Latosol and Humic Ferruginous Latosol groups) were incubated for six months with superphosphate or with guano phosphate at different levels. Representative samples of the soils were then used for phosphate fractionation studies and for pot experiments (using sorghum) to determine labile soil phosphate (L-) values. The results showed that soluble phosphate had been converted mainly to iron-bound and aluminium-bound forms, and only the acid soils showed any appreciable alteration of the guano phosphate (towards iron-bound forms) during the experimental period. Phosphate treatments given before the six months' storage period resulted in increased L-values for two of the threesoils (groups), but L-values obtained for the Humic Ferruginous Latosol samples did not reflect the amounts of phosphate added initially. The L-value assessment of initially untreated samples of this phosphate-deficient soil was clearly unacceptable in view of the poor crop growth obtained. Unacceptable results of this nature are likely to be obtained with soils having a high capacity to sorb phosphate, especially if little carrier phosphate is incorporated with the radioactive phosphate added. | |
| SOILS PHOSPHATES SOIL TYPES PLANT NUTRITION | |
| MAURITIUS | |
| Soils: Plant nutrition | |
| 1992-03-03 | |
| En | |
| Mauritius Sugar Industry Research Institute | |
| LIB | |
| CAT | |
| CHEM |