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Influence of Soil pH on the Availability of Added Boron¹

ABSTRACT

A Plano silt loam (Typic Argiudoll) with five relatively constant pH levels (4.7, 5.3, 5.8, 6.3, 7.4) was used to study the influence of soil pH on the availability of added B. A greenhouse study was conducted using tall fescue (Festuca arundinacea Schreb. Cv. ‘Kentucky 31’) with five soil pH levels, and four rates of applied B essentially equivalent to 0, 5, 10, and 20 kg/ha, and five herbage harvests. Herbage yields of tall fescue were not affected by either soil pH or B treatments; however, tissue B concentrations ranged from 8 to 739 ppm for the five harvests. Boron uptake by tall fescue was relatively uniform for soil pH levels of 4.7, 5.3, 5.8, and 6.3 within each level of B availability. Recovery percentages of 30 to 50% of the added B by five cuttings of forage indicate a soil fixation of B. Highest recovery percentage was associated with the highest rate of added B. A 2.5-fold drop in B uptake occurred at pH 7.4 as compared with the other soil pH levels indicating substantial fixation of B. Hot-water-soluble B content of the soil generally increased with an increase in pH and with added B. The soluble B test did not predict the low recovery of B at pH 7.4.

¹ Contribution from the Departments of Horticulture and of Soil Science, Univ. of Wisconsin-Madison. Research supported by the College of Agric. and Life Sci., Univ. of Wisconsin-Madison.

² Professor of Horticulture and Soil Science and Associate Professor of Horticulture, respectively, Univ. of Wisconsin, Madison, WI 53706.

Received for publication May 27, 1975. Accepted for publication November 17, 1975.