Identification and standardization of reactive phosphate rocks from Morocco

Belmehdi A., . and Mokhtar-Jamai M., . (1992) Identification and standardization of reactive phosphate rocks from Morocco. [Proceedings Paper]

Phosphate rock solubility tests are used to determine the agronomic potential of phosphate ore for direct application to acidic soils. Among tests some are used by trading companies others are used as standard methods by the E.E.C countries where specific solubility criteria are set for the selection of rock phosphates for direct application. The major purpose of all these laboratory methods is to obtain as close a correlation as possible between the methods used and the expected crop yield response under green-house and field conditions. This is why the adoption of these methods is conditioned largely by the results of field trials. A correlation between chemical testing methods and crop response in the field was established for a number of phosphate rocks under acid soils conditions with the result that some of the rocks have become to be known as highly reactive rocks. In this paper results obtained from the application of different phosphate solubility tests to a series of phosphate rocks from Morocco are compared to those obtained with three highly reactive rocks from overseas. From the tests and incubation experiments IMPHOS and CERPHOS were able to identify several reactive phosphate rocks which are commercially available in large quantities. In addition to reliability of supply one phosphate rock DAOUI stood well the field test under the humid tropical conditons of Asia. Preliminary results from Indonesia indicated that its direct application in combination with proper organic matter management are very promising for the reclamation of abandoned Alang Alang land and increase of its productivity

Full text available from:

Abstract

Phosphate rock solubility tests are used to determine the agronomic potential of phosphate ore for direct application to acidic soils. Among tests some are used by trading companies others are used as standard methods by the E.E.C countries where specific solubility criteria are set for the selection of rock phosphates for direct application. The major purpose of all these laboratory methods is to obtain as close a correlation as possible between the methods used and the expected crop yield response under green-house and field conditions. This is why the adoption of these methods is conditioned largely by the results of field trials. A correlation between chemical testing methods and crop response in the field was established for a number of phosphate rocks under acid soils conditions with the result that some of the rocks have become to be known as highly reactive rocks. In this paper results obtained from the application of different phosphate solubility tests to a series of phosphate rocks from Morocco are compared to those obtained with three highly reactive rocks from overseas. From the tests and incubation experiments IMPHOS and CERPHOS were able to identify several reactive phosphate rocks which are commercially available in large quantities. In addition to reliability of supply one phosphate rock DAOUI stood well the field test under the humid tropical conditons of Asia. Preliminary results from Indonesia indicated that its direct application in combination with proper organic matter management are very promising for the reclamation of abandoned Alang Alang land and increase of its productivity

[error in script]

Item Type:	Proceedings Paper
Additional Information:	1 fig. 15 tables; 7 ref. Summary En
AGROVOC Term:	FOSFATO MINERAL
AGROVOC Term:	IDENTIFICACION
AGROVOC Term:	NORMAS
AGROVOC Term:	MARRUECOS/ SOLUBILIDAD
AGROVOC Term:	APLICACION DE ABONOS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15044

Actions (login required)

View Item