SOIL PREPARATION

CHAPTER 11

Bengough, A.G., Mullins, C.E. & Wilson, G. 1997. Estimating soil frictional resistance to metal probes and its relevance to the penetration of soil by roots. European J. Soil Sci . 48 , 603-612. Bennie, A.T.P. & Botha, F.J.P. 1986. Effect of deep tillage and controlled traffic on root growth, water-use efficiency and yield of irrigated maize and wheat. Soil & Till. Res . 7 , 85-95. Bennie, A.T.P. & Krynauw, G.N. 1985. Causes, adverse effects and control of soil compaction. S. Afr. J. Plant Soil 2 , 109-114. Böhm, W. 1979. Methods of studying root systems. Ecological studies 33 . Springer-Verlag, Berlin, Heidelberg, New York. Bradford, J.M. & Gupta, S.C. 1986. Soil compressibility. In: A. Klute (ed.) Methods of soil analysis Part 1, 2nd ed. Agronomy 9, 479-472. ASA, Madison, WI, USA. Brink, D. 2005. Die effek van verskillende oppervlakbewerkingspraktyke op die wortelverspreiding van wingerd. MSc thesis, Stellenbosch University. Buttrose, M.S. & Mullins, M.G. 1968. Proportional reduction in shoot growth of grapevines with root systems maintained at constant relative volumes by repeated pruning. Aust. J. Biol. Sci . 21 , 1095-1101. C Cannell, R.Q. 1977. Soil aeration and compaction in relation to root growth and soil management. Adv. Appl. Biol . 2 , 1-86. Carstens, R. 2018. Personal communication. July, Stellenbosch. Cass, A. 2002. Sustainable viticultural production: Optimising soil resources (Project CRS 95/1). Final report to Grape and Wine research and Development Corporation, Australia. Cassel, D.K. 1982. Tillage effects on soil bulk density and mechanical impedance. In: D.M. Kral et al . (eds.), Predicting tillage effects on soil physical properties and processes . ASA Special Publication No. 44 , 45-67. ASA and SSSA, Madison, Wisconsin, USA. Cassel, D. & Nelson, L.A. 1979. Variability of mechanical impedance in a tilled one-hectare field of Norfolk sandy loam. Soil Sci. Soc. Am . J. 43 , 450-455. Claassen, F.A., Van Zyl, J.L. & Kleynhans, P.H. 1973. Vordering met grondvoor­ bereidingsproewe op Nietvoorbij en Robertson. Die Wynboer 7 , 27-30. Conradie, W.J. 1983. Liming and choice of rootstocks as cultural techniques for vines in acid soils. S. Afr. J. Enol. Vitic . 4 , 39-44. Conradie, W.J. 1988. Effect of soil acidity on grapevine root growth and the role of roots as a source of nutrient reserves. In: J.L. van Zyl (ed.) The grapevine root and its environment . Technical Communication 215 , Dept. of Agriculture, Pretoria, South Africa. pp. 16-29. Cots-Folsch, R., Martinez-Casanovas, J.A., & Ramos, M.C. 2006. Land terracing for new vineyard plantations in the north-eastern Spanish Mediterranean

SOIL PREPARATION | 159