Amelioration of subsoil acidity

References

• Bouton , J.H. and Sumner , M.E. 1983 . Alfalfa Medicapo sativa L. in highly weathered soils V. Field performance of alfalfa selected for acid tolerance . Plant Soil , 74 : 431 – 436 .
   Web of Science ®Google Scholar
• Bouton , J.H. , Sumner , M.E. , Hammel , J.E. and Shahandeh , H. 1986 . Yield of an alfalfa germplasm selected for acid tolerance when grown in soil with modified subsoil . Crop Sci. , 26 : 334 – 336 .
   Web of Science ®Google Scholar
• Hammel , J.E. , Sumner , M.E. and Shahandeh , H. 1985 . Effect of physical and chemical profile modification on soybean and corn production . Soil Sci. Soc. Amer. J. , 49 : 1508 – 1511 .
   Web of Science ®Google Scholar
• Sumner , M.E. , Shahandeh , H. , Bouton , J.H. and Hammel , J.E. 1986 . Amelioration of an acid soil profile through deep liming and surface application of gypsum . Soil Sci. Soc. Amer. J. , 50 : 1254 – 1258 .
   Web of Science ®Google Scholar
• McKenzie , R.C. and Nyborg , M. 1984 . Influence of subsoil acidity on root development and crop growth in soils of Alberta and Northeastern British Columbia . Can. J. Soil Sci. , 64 : 681 – 697 .
   Web of Science ®Google Scholar
• Sumner , M.E. 1970 . Aluminum toxlcity ‐ a growth limiting factor in some Natal sands . Proc. S. Afr. Sug. Tech. Assoc. , 44 : 197 – 203 .
   Google Scholar
• Richey , K.D. , Sousa , D.M.G. , Lobato , E. and Correa , O. 1980 . Calcium leaching to increase rooting depth in a Brazilian Savannah Oxisol . Agron. J. , 72 : 40 – 44 .
   Web of Science ®Google Scholar
• Reeve , N.G. and Sumner , M.E. 1972 . Amelioration of subsoil acidity in Natal Oxisols by leaching surface applied amendments . Agrochemophysica , 4 : 1 – 6 .
   Google Scholar
• Pavan , M.A. and Bingham , F.T. Effects of phosphogypsum and lime on yield, root density and fruit and foliar composition of apple in Brazilian Oxisols . Proc. II Int. Symp. Phosphogypsum . pp. 51 – 58 . Miami , FL : Univ. of Miami .
   Google Scholar
• Walworth , J.L. , Sumner , Isaac , R.A. and Plank , C.O. 1986 . Preliminary DRIS norms for alfalfa in the Southeastern United States and a comparison with Midwestern norms . Agron. J. , 78 : 1046 – 1052 .
   Web of Science ®Google Scholar
• Tennant , D. 1975 . A test of a modified line intercept method of estimating root length . J. Ecol. , 62 : 995 – 1001 .
   Web of Science ®Google Scholar
• Walworth , J.L. and Sumner , M.E. 1987 . The Diagnosis and Recommendation Integrated System (DRIS) . Adv. Soil Sci. , 6 : 149 – 188 .
   Google Scholar