References
- Cope , J. T. Jr. , Evans , C. E. and Williams , H. C. 1981 . Soil Test Fertilizer Recommendations for Alabama Crops , AL : Auburn University . Alabama Agric. Exp. Stn. Cir. 251
- Hue , N.V. and Adams , F. 1979 . Indirect determination of micrograms of sulfate by barium absorption spectroscopy . Comm. Soil Sci. Plant Anal. , 10 : 841 – 851 .
- Hue , N.V. and Evans , C.E. 1986 . Procedures used for soil and plant analysis by the Auburn University soil testing laboratory , Agronomy & Soils Department Series No. 106 AL : Alabama Agric. Exp. Stn., Auburn University .
- Kapusta , E. C. 1968 . “ Potassium fertilizer technology ” . In The Role of Potassium in Agriculture , Edited by: Kilmer , V. J. , Younts , S. E. and Brady , N. C. 23 – 52 . Madison, WI : American Society of Agronomy .
- Khomvilai , S. and Blue , W. C. 1978 . The effect of potassium carbonate on potassium, calcium, and magnesium content of agronomic crops on three differentially limed soils . Soil Crop Sci. Soc. Fla. Proc. , 37 : 166 – 171 .
- Southern Cooperative Series . 1983 . Reference Soil Test Methods for the Southern Region of the United States , Southern Coop. Ser. Bul. 289 Athens, GA : Georgia Agric. Exp. Stn. .
- Tisdale , S. L. , Nelson , W. L. and Beaton , J. D. 1985 . Soil Fertility and Fertilizer. , 4th edition , New York, NY : Macmillan, Inc. .