Analysis of Soil Nutrients States at Tobacco Growing Area in Chongqing

JIANG Houlong; ZHANG Dingzhi; LI Najia; XU Chen; YANG Chao; SHI Xiaojun

Abstract：In order to explore the soil fertility conditions in Chongqing tobacco growing areas and provide theoretical basis for soil improvement and fertilization strategy,the pH value,organic matter,available N, available P,available K,water-soluble Cl,and exchangeable Ca and Mg contents of soil in 10 counties in Chongqing tobacco growing areas were analyzed. The results showed that above 50% of the soil in the studied area were of acidity,and the proportion of pH value which was less than 5. 5 was more than 60%in the Qianjiang,Fengdu and Shizhu county. The contents of organic matter and available P were medium. The content of available N was generally high,available N content of 95. 71% soil samples was excess. The content of available K was generally appropriate,the available K content of 33. 10% soil samples was low. The content of water-soluble Cl was low,the proportion of soil samples whose water-soluble Cl content was suitable to plant tobacco was 33. 99%. The content of exchangeable Ca was little lower than medium, and the content of exchangeable Mg was little higher than medium. Therefore,the suggestions were put for-ward,such as strengthening the soil acidification in Chongqing tobacco growing areas,controlling N ferti-lizer application amount,supplementing P,K and Mg in moderation,and adding Cl and Ca fertilizers.