Phosphate rock dissolution in Indonesian andosols

Samid Sjarif, . (1992) Phosphate rock dissolution in Indonesian andosols. [Proceedings Paper]

Indonesian Andisols formed from various parent materials and with various soil chemical and mineralogical characteristics were used to determine the extent and rate of the phosphate rockPR dissolution. There were two distinct dissolution rates for PR applied to Andisols the rapid dissolution rate during an incubation period of up to one day was followed by slow dissolution. There are significant positive realationships between the PR dissolution value at one and 100 days incubation. Consequently PR dissolution in these soils for 100 days can be predicted by the dissolution value for one day which would greatly accelerate the evaluation of soils for their suitability to be fertilized with PR. There were several soil charateristics that were significantly related to the rate and extent of PR dissolution for which P sorption capacity was the most predictive. Soil pH and exchangeable Ca content which are believed to affect PR dissolution were not significantly correlated to PR dissolution value. It is likely the soil pH and Ca ion content are of less consequence for these soils which have a very high P sorption capacity. The Olsen-and Bray-extractable P values from PR disolution increased very rapidly for up to one day incubation thereafter the Olsen-P values decreased slightly up to three days incubation and then remained nearly constant. Bray l-P values decreased greatly after three days. This pattern is different to that reported for New Zealand Andisols. These results have shown that the rate and extent of PR dissolution in Indonesian Andisols are high which may indicate that PR can replace more expensive water soluble-P fertilizers i.e. TSP as a source of P for annual and perennial crops. However the extensive dissolution of PR does not necessarily result in a proportional increase in the amount of plant available P in the soil as indicated by a lower proportion of available P being provided by a unit of dissolved PR relative to a unit of water soluble-P. Although there have been no adequate experiment with PR fertilizers on Andisols in Indonesia an agronomic experiment to determine the effectiveness of PR in a field Andisols should be done

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Abstract

Indonesian Andisols formed from various parent materials and with various soil chemical and mineralogical characteristics were used to determine the extent and rate of the phosphate rockPR dissolution. There were two distinct dissolution rates for PR applied to Andisols the rapid dissolution rate during an incubation period of up to one day was followed by slow dissolution. There are significant positive realationships between the PR dissolution value at one and 100 days incubation. Consequently PR dissolution in these soils for 100 days can be predicted by the dissolution value for one day which would greatly accelerate the evaluation of soils for their suitability to be fertilized with PR. There were several soil charateristics that were significantly related to the rate and extent of PR dissolution for which P sorption capacity was the most predictive. Soil pH and exchangeable Ca content which are believed to affect PR dissolution were not significantly correlated to PR dissolution value. It is likely the soil pH and Ca ion content are of less consequence for these soils which have a very high P sorption capacity. The Olsen-and Bray-extractable P values from PR disolution increased very rapidly for up to one day incubation thereafter the Olsen-P values decreased slightly up to three days incubation and then remained nearly constant. Bray l-P values decreased greatly after three days. This pattern is different to that reported for New Zealand Andisols. These results have shown that the rate and extent of PR dissolution in Indonesian Andisols are high which may indicate that PR can replace more expensive water soluble-P fertilizers i.e. TSP as a source of P for annual and perennial crops. However the extensive dissolution of PR does not necessarily result in a proportional increase in the amount of plant available P in the soil as indicated by a lower proportion of available P being provided by a unit of dissolved PR relative to a unit of water soluble-P. Although there have been no adequate experiment with PR fertilizers on Andisols in Indonesia an agronomic experiment to determine the effectiveness of PR in a field Andisols should be done

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Item Type:	Proceedings Paper
Additional Information:	7 figs. 6 tables; 25 refs. Summary En
AGROVOC Term:	CALCIO
AGROVOC Term:	FOSFORO
AGROVOC Term:	NUEVA ZELANDIA
AGROVOC Term:	FOSFATO MINERAL
AGROVOC Term:	DISOLUCION
AGROVOC Term:	ANDOSOLES
AGROVOC Term:	INDONESIA/ SORCION DEL SUELO
AGROVOC Term:	PROPIEDADES FISICO-QUIMICAS SUELO
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15051

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