Full Text
(15 K)

A Comparison of Three Soil Test P Extractants on an Alkaline Louisiana Soil

E. Funderburg, J. Kovar, C. Smith, R. Elston


A comparison was conducted between Strong Bray, Mehlich 3 and Olsen's P extractants on a Norwood silt loam (Fine silty, mixed, calcareous, thermic Typic Udifluent) to determine which extractant was most correct in recommending fertilizer P. Soil test P levels varied greatly across the years tested. Strong Bray correctly recommended P fertilizer two of three years tested. Olsen's correctly recommended P fertilizer one of three years. Mehlich 3 incorrectly recommended P fertilizer all three years. However, the Mehlich 3 incorrect recommendations may be the result of recommending P fertilizers as a small maintenance amount. In all cases of incorrect recommendations, the methods recommended fertilizer where no yield response occurred. In no case did any method under-recommend P fertilizer.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 1428 - 1429
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
Document last modified Sunday, Dec 6 1998