00521nam a2200181Ia 4500008004100000020001500041082001700056100001100073245006400084260004000148300000800188650004100196650003400237653002000271653001700291653001200308700001900320170901s1979    xx            000 0 und d  a0047199757  a631.42bL14S  aLal, R 0aSoil Physical Properties and Crop Production in the Tropics  aNew YarkbJohn Wiley and Sonsc1979  a551  aAgriculture and related technologies  aTechnology (Applied sciences)  aCrop production  aSoil physics  aTropics  aGreenland, D.J