Phosphorus extractions under air-dried oxidized and reduced conditions for some rice soils from KADA

Alias Husin, . and Jamaludin Yusoff, . Phosphorus extractions under air-dried oxidized and reduced conditions for some rice soils from KADA. pp. 70-80. ISSN 0126-6128

A laboratory study was conducted for extracting available soil P by six chemical methods under air dried oxidized and reduced conditions for some rice soils. A total of eight soil series taken from Kemubu Agricultural Development Authority (KADA) were investigated. The ranking of the extractants used in terms of their extracting strength for the reduced condition was as follows: Olsen Bray No. 2 Double Acid Kapps Texas Buffer Bray No. 1 0.1N HCl. The mean P extracted by Olsen Bray No. 2 and Double Acid were 18.10 14. 75 and 12.01 ppm respectively. All the six chemical extractants demonstrated that the status of extractable P for KADA rice soils is low. Among these extractants it appeared that Bray No. 2 Double Acid and Olsen methods were capable of extracting P consistently from all the eight soil series under the three conditions investigated. When compared to oxidized condition reduction process significantly increased the extractable P except in O.lN HCl and Bray No. 1 extractants. The same pattern was observed for the air-dried condition except in Bray No. 1 where there was a significant decrease instead. The oxalate extractable iron in the three conditions were correlated with the respective P values. The highest coefficient of determination was observed for the Olsen extractant in the air-dried condition (R2 0.8286). For the anaerobic condition Bray 2 extractant was the superior ones (R2 0.6448). However for the aerobic condition Kapps Texas Buffer was the highest (R2 0.4206).

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Abstract

A laboratory study was conducted for extracting available soil P by six chemical methods under air dried oxidized and reduced conditions for some rice soils. A total of eight soil series taken from Kemubu Agricultural Development Authority (KADA) were investigated. The ranking of the extractants used in terms of their extracting strength for the reduced condition was as follows: Olsen Bray No. 2 Double Acid Kapps Texas Buffer Bray No. 1 0.1N HCl. The mean P extracted by Olsen Bray No. 2 and Double Acid were 18.10 14. 75 and 12.01 ppm respectively. All the six chemical extractants demonstrated that the status of extractable P for KADA rice soils is low. Among these extractants it appeared that Bray No. 2 Double Acid and Olsen methods were capable of extracting P consistently from all the eight soil series under the three conditions investigated. When compared to oxidized condition reduction process significantly increased the extractable P except in O.lN HCl and Bray No. 1 extractants. The same pattern was observed for the air-dried condition except in Bray No. 1 where there was a significant decrease instead. The oxalate extractable iron in the three conditions were correlated with the respective P values. The highest coefficient of determination was observed for the Olsen extractant in the air-dried condition (R2 0.8286). For the anaerobic condition Bray 2 extractant was the superior ones (R2 0.6448). However for the aerobic condition Kapps Texas Buffer was the highest (R2 0.4206).

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Item Type:	Article
AGROVOC Term:	Phosphorus
AGROVOC Term:	Air drying
AGROVOC Term:	Rice soil
AGROVOC Term:	Oxalates
AGROVOC Term:	Phosphorus
AGROVOC Term:	Fertilization
AGROVOC Term:	Cultivation
AGROVOC Term:	Oxygen
AGROVOC Term:	Permeability
AGROVOC Term:	Calcareous soils
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 00:39
URI:	http://webagris.upm.edu.my/id/eprint/22892

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