植烟土壤pH值与土壤养分的相关性研究

为提高烤烟施肥的针对性,测定了云南腾冲县的5个乡镇185个土壤样品的pH值,并进行了pH值与土壤养分的相关分析.结果表明:腾冲烟区土壤pH值范围在4.60到7.50之间,平均pH值为5.69.烟区67.6％的土壤呈弱酸性,另有31.4％的土壤为强酸性.土壤pH值与有机质、碱解氮、有效磷、速效钾、有效硼、交换性镁、有效锌呈显著相关.烟区土壤中交换性镁、水溶性氯离子含量较低,有机质、碱解氮、有效磷含量偏高.因此,腾冲烟区在烟叶生产上应注重调节土壤酸度,施用石灰和钙镁磷肥等碱性肥料改良土壤,以提高土壤营养元素的有效性.

Correlation between pH Value and Soil Nutrient in Tobacco Planted Soil in Tengchong

In order to define the fertilizer regime for tobacco,the pH value of 185 soil samples,which were collected from five villages and towns of Tengchong county,were determined,and the correlation between pH value and soil nutrient were also analyzed.The results showed that the pH value of tobacco planted soil in Tengchong County ranged from 4.60 to 7.50 with an average value of 5.69.67.5% of tobacco planted soil showed weakly acidic,the other 31.5% soil showed strongly acidic.A significant correlation showed between soil pH and contents of organic matter,available N,available P,available K,available B,exchangeable Mg and available Zn.In tobacco planted soil,the contents of Mg and water-soluble chloride ion are lower than average,but the contents of organic matter,available N and available P are higher than average.Therefore,it should pay attention to adjust soil pH value and apply alkaline fertilizer(such as lime and calcium magnesium phosphate,etc.) in order to enhance the availability of soil nutrient element.