云南省思茅地区土壤微量元素含量分布及其肥效

THE CONTENT AND DISTRIBUTION OF TRACE ELEMENT IN THE SOILS OF SIMAO DISTRACT IN YUNNAN

通过对思茅地区1049个土样分析测定,查明了土壤中微量元素硼、钼、锌、铜、锰的含量与分布。结果表明:全量硼、铜与全国土壤的平均含量大体一致;全铜、锌、锰则低于全国土壤的平均含量;有效态硼、钼、锌普遍缺乏,含量在临界值以下的样点分别占91%,77%,52%;有效态铜、锰较为丰富。另外在多年进行的58个点177次田间试验结果表明,施用微量元素肥料对不同作物有显著增产效果。

Trace element content of 1049 soil samples collected from Simao district in Yunnan were determined. Results obtained showed that the total contents B and Cu in the soils of Simao are approximately the same as the mean contents in soils of the country, those of Mo, Zn, Mn are lower than the mean values of the country; available B, Mo, Zn are generally deficient, the samples of which the contents of B, Mo and Zn are below critical values constitute 91%, 77%, and 52% respectively; availaible Cu and Mn are more abundant. Trace element contents in soils of Simao vary in a greater range, and they are distributed unevenly, being affected by genetic conditions such as parent materials, climate relief etc. and genetic process. 177 field experiments in 58 sites showed significant of trace element fertilizers on crop yield increase with a the increase rate of 14.1%.