00382nam a2200121Ia 4500008004100000082002200041245006900063260002000132300000900152600002500161600002000186650005400206140224s9999    xx            000 0 und d  a631.41:631.811 P3  aAssessment of soil nutrient balance;approaches and methodologies  aRomebFAOc2003  a87p.  a R.N. Roy and others  aRoy, R.N. et al  aSoil science,Soil nutrient balance,Soil nutrition