References
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- Beverly , R.B. 1991 . A Practical Guide to the Diagnosis and Recommendation Integrated System (DRIS) , Athens, GA : Micro‐Macro Publishing, Co. .
- Sumner , M.E. 1977 . Preliminary N, P and K foliar diagnostic norms for soybeans . Agron. J. , 69 : 226 – 230 .
- Beverly , R.B. , Sumner , M.E. , Letzsch , W.S. and Plank , C.O. 1986 . Foliar diagnosis of soybean by DRIS . Commun. Soil Sci. Plant Anal. , 17 (3) : 237 – 256 .
- Beverly , R.B. 1987 . Comparison of DRIS and alternative nutrient diagnostic methods for soybean . J. Plant Nutr. , 10 (8) : 901 – 920 .
- Hallmark , W.B. , Beverly , R.B. , Sumner , M.E. , deMooy , C.J. , Morris , H.F. , Pesek , John and Fontenot , J.D. 1990 . Soybean phosphorus and potassium requirement evaluation by three M‐DRIS data bases . Agron. J. , 82 : 323 – 328 .
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- Beverly , R.B. 1992 . Prescient diagnostic analysis shows sufficiency range approach superior to DRIS for Citrus . Commun. Soil Sci. Plant Anal. , 23 : 2641 – 2649 .
- Beverly , R.B. in press . Re‐evaluation reveals weaknesses of DRIS and sufficiency range diagnoses for wheat, corn and alfalfa . Commun. Soil Sci. Plant Anal. ,
- Bhangoo , M.S. and Albritton , D.J. 1972 . Effect of fertilizer nitrogen, phosphorus, and potassium on yield and nutrient content of Lee soybean . Agron. J. , 64 : 743 – 746 .