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Effect of Soil: Bray no. 1 Ratios on the Amount of Phosphorus Extracted from Calcareous Minnesota Soils¹

ABSTRACT

A field study was conducted to determine extractable phosphorus variability on highly fertilized calcareous soils when three different ratios (1:10, 1:50, and 1:100) of soil to Bray no. 1 extracting solution were used. Calcium carbonate equivalence (CCE) was determined on all samples and calcite/dolomite fractions were determined on randomly selected samples. On the soils where calcitic carbonates predominated, an inverse relationship was found between the amount of P extracted by the three ratios and the CCE. This relationship, however, was not as marked when the ratio of soil to Bray no. 1 extractant was increased to 1:50 and 1:100. On the dolomitic samples, an inverse relationship was also found between the P extracted by the 1:10 and 1:50 ratios and the CCE; however, no such relationship was noted when the 1:100 ratio was used. In general, the variability of the extractable P was greatly reduced in all samples when the wider ratios of soil to extractant were used. This investigation would indicate that available soil P from highly fertilized calcareous fields could be determined more accurately by using wider ratios of soil to Bray no. 1 extractant.

¹ Contribution from the Dept. of Soil Science, Univ. of Minnesota, Scientific Journal Series no. 6802 of the Minn. Agr. Exp. Sta. Presented before joint meeting of Div. S-4 and S-8, Soil Science Society of America Nov. 13, 1968, New Orleans, La.

² Research Assistant and Associate Professor of Soil Science. The senior author's present address is Dept. of Soils, Univ. of Wisconsin, Madison, Wis. 53706.

Received for publication September 8, 1970. Accepted for publication September 21, 1970.