Release of phosphorus from some acid soils of the Philippines through soil amendments
1988
Tripathi, B.P. | Dacayo, J.B. (Central Luzon State Univ., Munoz, Nueva Ecija (Philippines))
The release pattern of available and uptake of phosphorus at different lime rates adjusting pH of the soil to 5.5. and 6.0 and rice hull ash rates as 0.5 and 10t/ha on three acid soils (Bago loamy sand, Alaminos sandy clay loam and Antipolo sandy clay) was studied using dhaincha (Sesbania rostrata) as test crop. The pot experiment was undertaken at the screen house of the Department of Soil Science, College of Agriculture, Central Luzon State University, Munoz, Nueva Ecija [Philippines] from April to December 1987. Release pattern was evaluated from 3 soil samplings collected after 60 days sampling and 3 harvests of crop grown 45 days each. P release differed significantly among soil types. The available P in each soil was in the order of Antipolo sandy clayBago loamy sandAlaminos sandy clay loam. Independent application of lime to pH 6.0 and 10 tons rice hulls ash/ha significantly increased available P content in soil as well as total P uptake by crop. The net P release increased in Bago loamy sand and in Alaminos sandy clay loam with the application of 10 tons rice hull ash/ha when the soil pH was adjusted to 6.0 by liming whereas these amendments were detrimental for the release of P in Antipolo sandy clay. The total dry matter yield of four harvests as influenced by soil types were highly significant and were in order of Bago loamy sandAntipolo sandy clayAlaminos sandy clay loam. The application of soil amendments such as lime to raise soil pH to 6.0 and 10 tons rice hull ash/ha alone significantly increased the dry matter yield of Sesbania rostrata.
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