00267nam a2200085Ia 4500008004100000100003200041245006400073260003600137300000800173140113s9999    xx            000 0 und d  a"Lal, R. & Greenland, D.J."  aSoil Physical Properties and crop production in the tropics  a1979bJohn Wiley & SonscU.S.A.  a551