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《Southwest China Journal of Agricultural Sciences》 1989-01
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ZONING OF TRACE FERTILIZERS IN GUIZHUO AND ITS UTILIZATION

Yun Dixin Hu Zhou Fu Guozhi Sun Ruifeng Reng Gang (Institute of Soil and fertilizer, Guizhou Academy of Agricultural Science, Guiyang)  
The Guizhou Provincial Zoning of Trace Fertilizers is a part of the Gui-zhou Provincial Zoning of Fertilizer on the basis of the Guizhou Provincial Agricultural Zoning analysed the available contents of 6 trace elements of 846 soil samples collected from various regions of Guizhou, consulted the surplus and deficiency critical indexes of the trace elements drawn up by Naniing Institute of Soil Science, Academia Sinica,and referd to the results of the field tests at various places in the Province, the Trace Fertilizer Zoning divided the Guizhon Province into 6 first-grade regions: the Central Guizhou Region in which the application of the boric and zinc fertilizers should be increased and the application of molybdenum fertilizer should be supplied appropriately the Northern Guizhou Region in which the application of boric, zinc and molybdenum fertilizers should be increased;the North-Eastern Guizhou Region in which the application of boric fertilizer should be obviously increased, that of zinc fertilizer should be increased and that of molybdenum and manganese fertilizers should be supplied appropriately;the South-Eastern Guizhou Region in which the application of toric fectilizer should te obviously increased, that of molybdenum fertilizer should be increased and that of zinc-fertilizer should be supplied appropriately;the South-Western Guizhou Region in which the application of boric fertilizer should be obviously increased,that of zinc fertilizer should be increaced and that of molybdenum fertilizer should be supplied appropriately;the North-Western Guizhou Region in which the application of boric,zinc and molybdenum fertilizers should be increased and that of manganese fertizer should be supplied appropraitely.
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