Penetration resistance isopleths for assessment of soil strength under varying management regimesSojka, R.E. and Busscher, W.J. (1988) Penetration resistance isopleths for assessment of soil strength under varying management regimes. pp. 129-134. In: Proc. 11th Int'l. Conf. Int'l Soil Tillage Res. Organ. Scotland-Edinburg, 1988/07/11-15.
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