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Phosphorus dynamics in a tropical soil amended with green manures and natural inorganic phosphate fertilizers

Abstract

Alleviating P deficiency with natural inorganic phosphates and organic residues has significant economic and environmental advantages in the tropics. However, adapting this technology to various agroecosystems requires greater understanding of P dynamics in such systems. This was studied in an amended Bungor soil in laboratory incubation and glasshouse experiments. Treatments were a factorial combination of green manures GMs (Calopogonium caeruleum, Gliricidia sepium and Imperata cylindrica) and P fertilizers (phosphate rocks (PRs)) from China and Algeria, in 3 replications. The GMs were labeled with {sup 33}P in the glasshouse trial. Olsen P, mineral N, exchangeable Ca and pH were monitored in the incubation at 0,1,2,4,8,16,32 and 64 weeks after establishment (WAE). Soil P fractions were also determined at 64 WAE. Phosphorus available from the amendments at 4, 8, 15, and 20 WAE, was quantified by {sup 33}P-{sup 32}P double isotopic labeling in the glasshouse using Setaria sphacelata (Setaria grass) as test crop. Olsen P was unaffected by the sole P fertilizers, and hardly changed within 16 WAE in the legume GM and legume GM+PR treatments as NH{sub 4}{sup +}-N accumulated and soil pH increased. Afterwards Olsen P and exchangeable Ca increased as NH{sub 4}{sup +}-N and soil pH declined. The legume  More>>
Authors:
Rahman, Zaharah Abd; R, Bah Abd [1] 
  1. Universiti Putra Malaysia, Serdang (Malaysia). Dept of Land Management
Publication Date:
Jul 01, 2002
Product Type:
Conference
Resource Relation:
Conference: INC '02. International Nuclear Conference 2002: Global Trends and Perspectives, Kuala Lumpur (Malaysia), 15-18 Oct 2002; Other Information: poster presentation; PBD: 2002; Related Information: In: Proceedings of INC 02. International Nuclear Conference 2002: Global Trends and Perspectives, Seminar I: Agriculture and Biosciences, 253 pages.
Subject:
60 APPLIED LIFE SCIENCES; ECOSYSTEMS; INORGANIC COMPOUNDS; LABELLED COMPOUNDS; PHOSPHATES; PHOSPHORUS 33; RADIONUCLIDE MIGRATION
OSTI ID:
20347424
Research Organizations:
Malaysian Institute for Nuclear Technology Research, Bangi (Malaysia); Malaysian Nuclear Society, Bangi (Malaysia); International Atomic Energy Agency, Vienna (Austria); Forum for Nuclear Cooperation in Asia, Tokyo (Japan); Ministry of Science, Technology and Environmental Malaysia, Kuala Lumpur (Malaysia)
Country of Origin:
Malaysia
Language:
English
Other Identifying Numbers:
TRN: MY0302014031918
Availability:
Available at Malaysian Inst. for Nuclear Technology Research (MINT), Bangi, Malaysia; Ainon@mint.gov.my
Submitting Site:
INIS
Size:
page(s) 242-253
Announcement Date:

Citation Formats

Rahman, Zaharah Abd, and R, Bah Abd. Phosphorus dynamics in a tropical soil amended with green manures and natural inorganic phosphate fertilizers. Malaysia: N. p., 2002. Web.
Rahman, Zaharah Abd, & R, Bah Abd. Phosphorus dynamics in a tropical soil amended with green manures and natural inorganic phosphate fertilizers. Malaysia.
Rahman, Zaharah Abd, and R, Bah Abd. 2002. "Phosphorus dynamics in a tropical soil amended with green manures and natural inorganic phosphate fertilizers." Malaysia.
@misc{etde_20347424,
title = {Phosphorus dynamics in a tropical soil amended with green manures and natural inorganic phosphate fertilizers}
author = {Rahman, Zaharah Abd, and R, Bah Abd}
abstractNote = {Alleviating P deficiency with natural inorganic phosphates and organic residues has significant economic and environmental advantages in the tropics. However, adapting this technology to various agroecosystems requires greater understanding of P dynamics in such systems. This was studied in an amended Bungor soil in laboratory incubation and glasshouse experiments. Treatments were a factorial combination of green manures GMs (Calopogonium caeruleum, Gliricidia sepium and Imperata cylindrica) and P fertilizers (phosphate rocks (PRs)) from China and Algeria, in 3 replications. The GMs were labeled with {sup 33}P in the glasshouse trial. Olsen P, mineral N, exchangeable Ca and pH were monitored in the incubation at 0,1,2,4,8,16,32 and 64 weeks after establishment (WAE). Soil P fractions were also determined at 64 WAE. Phosphorus available from the amendments at 4, 8, 15, and 20 WAE, was quantified by {sup 33}P-{sup 32}P double isotopic labeling in the glasshouse using Setaria sphacelata (Setaria grass) as test crop. Olsen P was unaffected by the sole P fertilizers, and hardly changed within 16 WAE in the legume GM and legume GM+PR treatments as NH{sub 4}{sup +}-N accumulated and soil pH increased. Afterwards Olsen P and exchangeable Ca increased as NH{sub 4}{sup +}-N and soil pH declined. The legume GMs augmented reversibly sorbed P in Al-P and Fe-P fractions resulting in high residual effect, but fertilizers was irreversibly retained. GM-P availability was very low (< 4%), but GMs enhanced PR solubility and mobilized soil P irrespective of quality, probably by the action of organic acids. Calcium content had negative effect on available P and should be considered when selecting compatible materials in integrated systems. The results are further evidence of the importance of the soil P mobilization capacity of organic components in integrated P management systems. Even low quality Imperata can augment soil P supply when combined with the reactive APR, probably by conserving soil moisture. (Author)}
place = {Malaysia}
year = {2002}
month = {Jul}
}