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Comparison of Several Lime Requirement Methods on Coarse-textured Soils of Northeastern Nebraska¹

ABSTRACT

Soils of the eastern Sandhills of Nebraska are becoming progressively more acid as a result of the development of irrigation and subsequent use of high N fertilizer amounts for corn (Zea mays L.). Chemical determinations of lime requirement are expected to vary in their applicability to these poorly buffered, sandy soils. The objective of this research was to compare the abilities of selected chemical methods of determination of lime requirement to predict lime needs of sandy soils. The lime requirement values of 74 acid sandy soils from northern Nebraska were determined by eight methods. Correlation and regression were used to compare these values with those obtained by incubating the soils with varying amounts of lime in the laboratory. The validity of the CaCO₃ incubation method as a standard method was confirmed by a Ca(OH)₂ titration procedure. Most of the soils studied required <4492 kg of lime ha^–1 to attain soil pH 6.5. The relationship between the values from chemical determination of lime requirement with those from incubation were essentially linear for all methods. Although the nature of the relationship as expressed in the intercepts and slopes of the regression curves and the precision varied among methods, values from all methods were correlated with lime requirement values from incubation. Determination of the correlations among methods showed that lime requirement values for each method were highly correlated with those from every other method included in the study. Correlation studies of lime requirement values for five methods with selected soil properties showed that no single property was correlated with all methods. However, soil pH, clay content, cation exchange capacity, and Mn and Al contents were correlated with values from at least one method.

¹ Published as Paper no. 7761, Journal Series, Nebraska Agric. Exp. Stn.

² Former Graduate Student, and Professors of Agronomy, Univ. of Nebraska, Lincoln, NE 68583. Fourth author was Professor of Agronomy, Northeast Exp. Stn., Univ. of Nebraska. His present address is Soil Science Dep., Univ. of Minnesota, St. Paul, MN 55108.

Received for publication April 26, 1985.

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