Four soils of wide range in exchangeable Al and basic cation status, two from Ohio and two from Bangladesh, were treated and equilibrated with five rates of P. Each soil and treatment was analyzed for “available”; P by the following methods: Bray‐1 and double acid (Mehlich No. 1) extractable, and pressure membrane (1/3 to 15 bar) and double field capacity water extractable (suction). The P‐treated soils were placed in pots and cropped with wheat in a growth chamber. The soil “available”; P data for Bray‐1, Mehlich, and pressure membrane extractions were all relatively highly correlated with that of each other and with both P concentration in and uptake of P by the crop. The Bray‐1 available P vs yield data evidently fit the Bray‐Mitscherlich equation well when the Ohio and Bangladesh soils are treated as different populations due to differences in: a) maximum yields, b) available P levels where maximum yields occurred, and c)c1values of the equation. These differences are partly due to marginal levels of Zn in the Bangladesh soils which evidently limited yields. Linear correlation of the yield function, log (A‐y) vs the soil available P function log A‐c1x for all soils gave r = 0.961. None of the other methods gave data which approached this degree of correlation between these two values. Also, in simple linear regressions of the various crop and soil parameters, correlations of data from the Bray‐1 method were generally slightly superior to those from the Mehlich and pressure membrane methods, while those from all three were definitely superior to those from the double field capacity water extractable method.