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- [28] EFFECT OF CONTACT ZONES IN COMPACTIONS OF THE UPPER SUBSOIL ON ROOT-GROWTH AND WATER EXTRACTION AT DIFFERENT SOIL-MOISTURE RATES AND BULK DENSITIES ARCHIV FUR ACKER UND PFLANZENBAU UND BODENKUNDE-ARCHIVES OF AGRONOMY AND SOIL SCIENCE, 1988, 32 (06): : 379 - 387