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Effects of Adding Aluminium Sulfate on some Chemical Properties of Soil in tea garden

XIA Wen-juan,ZHANG Li-xia,XIANG Qin-zeng,HUANG Xiao-qin (Horticultural College of Shandong Agricultural University,Tai'an 271018,China)  
500~2000 milligrams of aluminum[Al~(3+)]were added to per one kilogram of soil with the slight acid(pH6.7),then some items of soil were determined,such as pH value,the content of exchangeability calcium/magnesium and the trace element content of Cu,Fe,Mn,Zn in the soil.The result indicated that with the increase of Al~(3+) quantities,pH value and the content of exchangeability calcium decreased,but the content of exchangeability magnesium increased.The soil pH value decreased significantly when the range of Al~(3+) quantities was 500~1500mg/kg.The decreasing breath achieved 0.60,0.78,0.28.However,pH value decreased unsignificantly(only 0.06) when Al~(3+) quantity was 2000mg/kg,meanwhile,the content of trace element Cu,Fe,Zn in the soil increased significantly.The applicable quantity was 500~1500mg Al~(3+) per one kilogram of soil.
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