The Bray, Mehlich and Kelowna soil P tests as affected by soil carbonates.

Abstract

A study was conducted with five soil P tests (Bray P1 (1:10), Bray P1 (1:50), Mehlich II, Kelowna I and Kelowna II) to determine the effect of soil carbonates on postextraction pH and on the correlation between soil and plant P concentration. The ability of the extractants to maintain a low pH with calcareous soils was poorest for the Bray P1 (1:10) followed by the Mehlich II, Kelowna I, Kelowna II and Bray P1 (1:50). The Bray P1 (1:10) did not give a statistically significant correlation coefficient between soil and plant P concentration with the calcareous soils, while the other methods did. -from Authors