Improving CIPR efficiency using CIPR-TSP mixtures

Rosmaria A.K., . and Siva K.B., . and Aminuddin Hussin, . (1998) Improving CIPR efficiency using CIPR-TSP mixtures. [Proceedings Paper]

Most Malaysian soils are acidic and have a high phosphate-fixing capacity which renders low soil phosphorus P status. Direct use of Christmas Island Phosphate Rock CIPR to alleviate such a problem is an economical option when compared to use of soluble P fertiliser i.e Triple Super Phosphate TSP. Comparatively however CIPR is less reactive and efficient in releasing P for plant uptake. One way of overcoming this limitation is by mixing CIPR with soluble P fertiliser which yields phosphoric acid and calcium phosphate. Since the solubility of phosphate rock increases under acidic regimehigh H subscript concentration the phosphoric acid produced should potentially increase the solubility of CIPR. A study was conducted to evaluate the effect of CIPR and TSP mixtures on P and calcium Ca recovery from two Malaysian soils of differing pH. Treatments employed included single applications of either CIPR or TSP at rates ranging from 100 to 300 mg/kg for the former and 50-200 for the latter. Mixtures of TSP-CIPR were applied in ratios of 1:1 and 1:3. Recovery of P and Ca was recorded over time up to 90 days after treatment. Results indicated that TSP-CIPR mixtures increased P release when compared to single application of CIPR in both soils. Increased release of Ca from the mixtures was evident only in the acid soil. Release of P increased with increase in mixture concentration and were more pronounced in mixtures bearing a ration of 1:1. The mixtures however did not yield added benefits in P and Ca release when compared with summed values derived from single applicatons of CIPR and TSP.

Full text available from:

Abstract

Most Malaysian soils are acidic and have a high phosphate-fixing capacity which renders low soil phosphorus P status. Direct use of Christmas Island Phosphate Rock CIPR to alleviate such a problem is an economical option when compared to use of soluble P fertiliser i.e Triple Super Phosphate TSP. Comparatively however CIPR is less reactive and efficient in releasing P for plant uptake. One way of overcoming this limitation is by mixing CIPR with soluble P fertiliser which yields phosphoric acid and calcium phosphate. Since the solubility of phosphate rock increases under acidic regimehigh H subscript concentration the phosphoric acid produced should potentially increase the solubility of CIPR. A study was conducted to evaluate the effect of CIPR and TSP mixtures on P and calcium Ca recovery from two Malaysian soils of differing pH. Treatments employed included single applications of either CIPR or TSP at rates ranging from 100 to 300 mg/kg for the former and 50-200 for the latter. Mixtures of TSP-CIPR were applied in ratios of 1:1 and 1:3. Recovery of P and Ca was recorded over time up to 90 days after treatment. Results indicated that TSP-CIPR mixtures increased P release when compared to single application of CIPR in both soils. Increased release of Ca from the mixtures was evident only in the acid soil. Release of P increased with increase in mixture concentration and were more pronounced in mixtures bearing a ration of 1:1. The mixtures however did not yield added benefits in P and Ca release when compared with summed values derived from single applicatons of CIPR and TSP.

[error in script]

Item Type:	Proceedings Paper
AGROVOC Term:	SOIL
AGROVOC Term:	ROCK PHOSPHATE
AGROVOC Term:	PHOSPHORUS
AGROVOC Term:	ALKALINE SOILS
AGROVOC Term:	SAMPLING
AGROVOC Term:	ACID SOILS
AGROVOC Term:	DISSOLVING
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16328

Actions (login required)

View Item