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一、前言 我国具有丰富的褐煤资源,褐煤的热稳定性差,发热量低,工业上被称为劣质煤,很大数量的褐煤不能被利用,这样既造成浪费又影响环境。由于褐煤腐植酸与土壤腐植酸在组成、性质及对土壤和作物的影响有类似之处,因此褐煤腐植酸在农业领域的应用研究一直受到世界各国的重视。自60年代起,美、日、苏(原苏联)、法、奥地利等国相继建立了腐植酸类肥料的生产厂,其中以原苏联和日本发展速度最快,规模也最大。我国
I. INTRODUCTION Our country is rich in lignite resources. Lignite has poor thermal stability, low calorific value, and is called inferior coal in industry. A large amount of lignite can not be utilized, which results in waste and environmental impact. Because the humic acid of lignite and soil humic acid have similarities in composition, nature and impact on soil and crop, the research and application of humic acid in agriculture in the field of lignite has been paid great attention by all countries in the world. Since the 1960s, the United States, Japan and the Soviet Union (former Soviet Union), France, Austria and other countries have established humic acid fertilizer production plants, of which the former Soviet Union and Japan’s fastest growing, the largest scale. My country