HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (6) Citing Articles via Google Scholar Google Scholar Articles by Prochnow, L. I. Articles by Henao, J. Search for Related Content PubMed Articles by Prochnow, L. I. Articles by Henao, J. Agricola Articles by Prochnow, L. I. Articles by Henao, J. Related Collections Phosphorus

PHOSPHORUS MANAGEMENT

Greenhouse Evaluation of Phosphorus Sources Produced from a Low-Reactive Brazilian Phosphate Rock

^a Dep. of Soil and Plant Nutrition, Univ. of São Paulo/ESALQ, C.P. 9, 13418-900, Piracicaba, Brazil, and IFDC, P.O. Box 2040, Muscle Shoals, AL 35662 during 1999–2001
^b IFDC, P.O. Box 2040, Muscle Shoals, AL 35662

^* Corresponding author (nchien{at}ifdc.org).

Received for publication June 30, 2003. The Patos de Minas phosphate rock (PR) in Brazil is not suitable for direct application due to its low reactivity or for commercial production of P fertilizers because of its high Fe-Al content. The objective of this study was to investigate the potential agronomic effectiveness of P sources with low water solubility produced from the PR. The P treatments were (i) compacted granular Patos PR with a single superphosphate (SSP) containing high water-soluble P content at a P ratio of 50:50, (ii) powdered low-grade single superphosphate (LG SSP) produced from Patos PR with low water solubility, (iii) powdered Patos PR, (iv) powdered mixture of PR and SSP at 50:50 P ratio, and (v) compacted granular SSP. The P sources were incorporated into an acid soil with pH 5.3 at 0, 10, 25, 50, and 100 mg P kg^–1 to grow wheat (Triticum aestivum L.) and ryegrass (Lolium perenne L.) as test crops in a greenhouse study. We confirmed that Patos PR was low in agronomic effectiveness, only 1 and 30% as effective as SSP in producing dry matter yield of wheat and ryegrass, respectively. There were no significant differences between LG SSP or compacted PR+SSP [PR+SSP(C)] and SSP in dry matter yields of both crops, whereas mixed PR+SSP was less effective than PR+SSP(C) compared with granular SSP. Compacted PR+SSP and LG SSP can be potential P sources to be produced from the low-grade PR that could not be used either for direct application or acidulated P fertilizers.

Abbreviations: LG SSP, low-grade single superphosphate • PR, phosphate rock • PR+SSP(C), compacted phosphate rock with single superphosphate • PR+SSP(M), mixture of powdered phosphate rock with powdered single superphosphate • RAE, relative agronomic effectiveness • RE, relative effectiveness • SSP, single superphosphate

This article has been cited by other articles:

				F. Shigaki, A. Sharpley, and L. I. Prochnow Source-Related Transport of Phosphorus in Surface Runoff J. Environ. Qual., October 27, 2006; 35(6): 2229 - 2235. [Abstract] [Full Text] [PDF]