三明烟区土壤pH值与土壤有效养分的相关性

为了查明三明烟区土壤的主要障碍因子 ,提高烤烟施肥的针对性 ,对三明烟区 11个县的 2 68个土壤样品pH值及有效养分含量进行了测定。结果表明 :三明烟区植烟土壤pH值在 4 .6～ 7.5的范围内 ,中强酸性土壤占所调查土壤总样品数的 89.5 5 %。土壤pH值与碱解N、速效K、交换性Ca、交换性Mg、有效Zn、水溶性B和活性Mn有极显著的相关性。三明烟区土壤中Ca、Mg、B含量较低 ,这与土壤酸度过大有直接关系 ,因此 ,烟叶生产上应重视调节土壤酸度 ,施用石灰和钙镁磷肥等碱性肥料 ,提高土壤营养元素的有效性 ,并注意增加K、Mg、B肥

Correlation Between pH Value and Nutrients in Soil of the Tobacco-growing Areas of Sanming City in Fu-jian Province

In order to find out main impedimental factors in soils and make the purpose of flue-cured tobacco fertilization definite, the pH value and available nutrients content of 268 soil samples collected from Sanming tobacco-growing areas were determined. The results showed that the range of soil pH value was from 4.6 to 7.5 in Sanming tobacco-growing areas, the ratio of acidic soil among samples was 89.55%. The pH value correlated significantly or very significantly with alkali-hydrolyzale N, rapidly available K, exchangeable Ca, exchangeable Mg, available Zn, water-soluble B, and active Mn. The concentration of Ca?Mg and B in low pH value soil were lower because of high soil acidity. Therefore basic fertilizers, such as lime and calcium magnesium phosphate should be applied to adjust soil acidity and increase the availability of soil nutrients. K, Mg and B fertilizers should be complemented.