Long term effect of three phosphate sources on rice

Xaviar Arulandoo, . and Aziz Bidin, . (1996) Long term effect of three phosphate sources on rice. [Proceedings Paper]

The unavailability of information on many phosphate sources initiated an investigation on those sources and the effect of their continuous long usage on rice yields. Three phosphate sources - a high-reactive rock phosphate HR-RP triple superphosphate TSP and a regular rock phosphate RP - were used in the investigation at Mulong Lating Kelantan. The rates used were 0 20 50 90 150 kg P2O5/ha. and an RCBD with three replications were employed. The sources were applied cumulatively for 6 seasons after which every treatment plot was divided into smaller plots. To one of the smaller plots the phosphate sources were cumulatively added as before for another 5 seasons cumulative and to the other addition of phosphate sources were stopped residuals. Result shows that rice yield showed wide seasonal variations. No noticeable trend was observed for the early seasons but by the 6th season HR_RP gave a more consistent enhancement of 0.5 t/ha while RP and TSP provided yield enhancement ranging 0.2-0.5 t/ha. After the plots were split yield enhancements from the cumulative plots increased by 0.7 to 0.9 t/ha or greater while those from the residual plots decreased to about 0.1-0.3 t/ha. Generally with cumulative applications and average over rates and seasons there was no difference in grain yield due to phosphate sources. But during later seasons yields from HR_RP were higher than for RP and TSP in that order. Seasonal variations may have played a part in masking certain trend due to sources. Soil analysis showed that fertilized plots showed higher available P than unfertilized plots. The soils taken after Season 11 showed that the residual plots had only marginally lower availabel P than the cumulative plots despite not receiving phosphate fertilizer for the last five seasons. Grain N content showed higher value with phosphate applications.

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Abstract

The unavailability of information on many phosphate sources initiated an investigation on those sources and the effect of their continuous long usage on rice yields. Three phosphate sources - a high-reactive rock phosphate HR-RP triple superphosphate TSP and a regular rock phosphate RP - were used in the investigation at Mulong Lating Kelantan. The rates used were 0 20 50 90 150 kg P2O5/ha. and an RCBD with three replications were employed. The sources were applied cumulatively for 6 seasons after which every treatment plot was divided into smaller plots. To one of the smaller plots the phosphate sources were cumulatively added as before for another 5 seasons cumulative and to the other addition of phosphate sources were stopped residuals. Result shows that rice yield showed wide seasonal variations. No noticeable trend was observed for the early seasons but by the 6th season HR_RP gave a more consistent enhancement of 0.5 t/ha while RP and TSP provided yield enhancement ranging 0.2-0.5 t/ha. After the plots were split yield enhancements from the cumulative plots increased by 0.7 to 0.9 t/ha or greater while those from the residual plots decreased to about 0.1-0.3 t/ha. Generally with cumulative applications and average over rates and seasons there was no difference in grain yield due to phosphate sources. But during later seasons yields from HR_RP were higher than for RP and TSP in that order. Seasonal variations may have played a part in masking certain trend due to sources. Soil analysis showed that fertilized plots showed higher available P than unfertilized plots. The soils taken after Season 11 showed that the residual plots had only marginally lower availabel P than the cumulative plots despite not receiving phosphate fertilizer for the last five seasons. Grain N content showed higher value with phosphate applications.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. mal S590.2 S683 1995 Call
AGROVOC Term:	ORYZA SATIVA
AGROVOC Term:	RICE
AGROVOC Term:	PHOSPHATES
AGROVOC Term:	ROCK PHOSPHATE
AGROVOC Term:	SUPERPHOSPHATE
AGROVOC Term:	FERTILIZER APPLICATION
AGROVOC Term:	YIELDS
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/16301

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