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Humic-Fulvic Acid Content in Soils as Related to Ley Clipping Management and Fertilization¹

ABSTRACT

Studies on changes of humic-fulvic acid content in a Eustis loamy sand due to weekly clipped Pensacola bahiagrass (Paspalum notatum Parodi) and fertilization showed that nitrogen fertilization encouraged formation of humic acid and decreased fulvic acid contents in soils. Longer clipping intervals tended to increase the amount of both humic and fulvic acid when nitrogen fertilization was applied.

A significant positive correlation between nitrogen or organic-P contents of the soil and humic/fulvic acid ratios indicated that humic-fulvic acid formation was affected by soil nitrogen content (or organic-P). A correlation also existed between humic-fulvic acid and pH, in which a decrease of soil pH resulted in an increase of humic/fulvic acid ratio.

¹ Journal Series Paper no. 975 of the Univ. of Georgia, College of Agr. Exp. Sta., College Sta., Athens, Georgia 30601.

² Assistant Professor, Professor, and Associate Professor, Department of Agronomy, Univ. of Georgia, and Superintendent Americus Plant Material Center, Americus, Georgia, respectively.

Received for publication January 10, 1972. Accepted for publication March 27, 1972.