Critical Limit of Extractable Phosphorous in a Gleysol for Rice Production in the Senegal River Valley of West Africa

B.V. Bado, M.E. de Vries, S.M. Haefele, M.C.S. Marco, M.K. Ndiaye

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17 Citations (Scopus)

Abstract

Soil-test correlation and calibration, a useful tool for fertilizer recommendations, has been little used in West Africa. Soils from a long-term fertility experiment have been used to study the relationship between rice yields and soil extractable phosphorus (P) with Bray 1 and Olsen methods. The Cate and Nelson graphical method was used for critical limits of soil P determination. The critical limits of soil extractable P at 95% relative grain yield were 9 mg P for the Bray 1P and 17 mg P kg21 for Olsen P. The Olsen P was more correlated (r ¼ 0.63) with rice grain yields than Bray P (r ¼ 0.50), but a strong correlation (r ¼ 0.92) was also observed between the values of the two methods. Results indicate that at levels less than these critical levels of extractable P, P fertilizers should be applied to increase rice yields.
Original languageEnglish
Pages (from-to)202-206
JournalCommunications in Soil Science and Plant Analysis
Volume39
Issue number1-2
DOIs
Publication statusPublished - 2008

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