土壤和植物中元素的含量情况 stored land plants land plants concentration element in soil ppm dry matter ppm average ppm factor n nitrogen P phosphorus 1,0010050002000 20 S sulphur 700 1,000-8.000 2.000 k potassium 700 500-8.000 1.000 Ca lime 14000 5.000-50.000 10.000 0.7 Mg magnesium 14.000 5.000-50000 10.000 0.7 Fe iron 5.000 1,000-10,000 2.000 0.4 Mn manganes 38.000 50-1000 100 Zn zinc 900 20-300 50 Cu copper 10-100 20 0.4 Mo molybdenum 2-20 0.3 b boron 0.1-1 0.2 0.1 CI chlorine 5-100 20 2 Ni nickel 200-1000 100 Se e selenium Co cobalt I iodineelement stored in soil ppm land plants dry matter ppm land plants average ppm concentration factor N nitrogen P phosphorus S sulphur K potassium Ca lime Mg magnesium Fe iron Mn manganes Zn zinc Cu copper Mo molybdenum B boron Cl chlorine Ni nickel Se selenium Co cobalt I iodine 1,000 700 700 14,000 14,000 5,000 38,000 900 50 20 2 10 100 ? ? 10,000-50,000 1,000-8,000 500-8,000 5,000-50,000 5,000-50,000 1,000-10,000 50-1000 20-300 10-100 2-20 0.1-1 5-100 200-1000 ? ? 20,000 2,000 1,000 10,000 10,000 2,000 100 50 20 6 0.2 20 100 ? ? 20 3 1.5 0.7 0.7 0.4 - - 0.4 0.3 0.1 2 1 ? 土壤和植物中元素的含量情况