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Effects of Lime upon Soil and Plant Manganese Levels in an Acid Soil¹

ABSTRACT

‘Charlottetown 80’ and ‘Herta’ barley (Hordeum vulgare L.), ‘Charlevoix Red Kidney’ and ‘French Horticultural Bush’ beans (Phaseolus vulgaris, L.), and ‘Century’ peas (Pisum sativum L.) were planted in an acidic podzol soil (pH 4.7) after application of dolomitic limestoen at rates of 0, 375, 750, and 1,500 ppm. Soil and tissue samples obtained at bloom (beans and peas) and at heading and maturity (barley) indicated that soil Mn extracted with H₂O and with neutral 1N NH₄OAc as well as plant tissue Mn levels were markedly reduced by liming. Soil Mn levels were well correlated with pH and tissue Mn levels. Manganese toxicity symptoms were observed at tissue Mn levels of approximately 1,000 ppm in beans, 550 ppm in peans, and 200 ppm in barley.

Charlevoix Red Kidney beans appeared a good indicator plant for Mn toxicity studies.

¹ Contribution no. 216, Research Station, Canada Department of Agriculture, Charlottetown, P. E. I. Presented before Div. S-4 Soil Science Society of America, Detroit, Mich., November 1969.

² Research Scientist.

Received for publication February 9, 1970. Accepted for publication March 24, 1970.