一、前言 我国农田中,大约有2/3缺磷,1996年我国生产磷肥575万吨,进口磷肥100余万吨,产量与用量都为世界首位。但是,由于磷肥利用率低,当季利用率一般只有10～25％,造成某些地区缺磷而减产。我省有丰富的磷矿资源,素以品位高、储量大而闻名全国,有些磷矿资源P_2O_5含量达到35％以上,每年有78.33万吨远销国内外。我省腐植酸资源也 I. Preface About 2/3 of the farmland in China is deficient in phosphorus. In 1996, China produced 5,750,000 tons of phosphate fertilizer and over 1 million tons of phosphate fertilizer. The output and consumption of the two countries ranked the first in the world. However, due to the low utilization rate of phosphate fertilizer, seasonal utilization rate is generally only 10% to 25%, resulting in a decrease in phosphorus production in some areas. Our province is rich in phosphate rock resources, known as high quality, large reserves and is known throughout the country, some phosphate rock resources P_2O_5 content of more than 35%, 783,300 tons per year are sold both at home and abroad. Humic acid resources in our province too