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Influence of Tillage Practices on the Fertility Status of an Acid Soil Double-Cropped to Wheat and Soybeans¹

Multiple cropping in conjunction with various minimum tillage practices is currently a conspicuous agricultural production method in the southeastern U.S. The objective of this study was to determine the influence of 5 years of various tillage practices on the fertility status of an Ultisol continuously double-cropped to wheat (Triticum aestivum L.) and soybeans (Glycine max L.). The tillage treatments for each fallhpring were: no-tillage/no-tillage, harrow/ho-tillage, conventional tillageho-tillage, no-tillage/conventional tillage, harrow/conventional tillage, conventional tillage/conventional tillage. With no-tillage, soil pH decreased more rapidly with depth than with conventional tillage treatments. Accumulations of Ca, Mg, P, Mn, and Zn occurred in the surface soil with no-tillage treatments, but surface soil K was lower with no-tillage compared to conventional tillage treatments. Organic C and N did not accumulate in the soil surface under no-tillage to the degree reported in other studies. Results indicate that continuous no-tillage results in increased nutrient concentrations in the surface soil with a rapid decrease with depth, while conventional tillage resulted in a more homogeneous soil with respect to soil fertility status

Key Words: Soil pH • Phosphorus • Potassium • Calcium • Magnesium • Copper • Manganese • Zinc • No-tillage

² Assistant professor, associate professor, former assistant professor, and former assistant professor, Georgia Agric. Exp. Stn., Experiment, GA 30212.

Received for publication September 21, 1981.

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