论文部分内容阅读
天然的腐植酸是由植物残体经微生物一系列分解和合成而形成的。它广泛存在于土壤、河泥、草炭、褐煤、风化煤中,有一定肥效,但大部分难溶于水,难被植物吸收。若与钾、钠、铵等离子化合,或加上氮磷钾化肥,就容易被植物吸收。近年来周内外的研究指出,将腐植酸类物质添加在磷肥中,或用含腐植酸较多的泥炭、农家肥与速效磷肥混施,可提高磷肥肥效。磷肥不足利用牵低近年来,我国化肥生产虽然发展很快,但主要是氮肥,磷肥不足,钾肥更少。1978年美国生产的化肥,氮磷钾比例为1:0.75:0.20;苏联为1:0.62:0.92;我国为1:0.135:0.002。若按每亩耕地施用化肥有效养分总量计算,1978年美国为13.3
Natural humic acid is formed by a series of microbial decomposition and synthesis of plant residues. It is widespread in soil, river mud, peat, lignite, weathered coal, have some fertilizer, but most are insoluble in water, difficult to be absorbed by plants. If with potassium, sodium, ammonium ion compound, or add NPK fertilizer, it is easily absorbed by plants. Recent studies in and outside of the country in recent years have pointed out that the addition of humic substances to the phosphate fertilizer or the use of peat containing more humic acid can improve the efficiency of the phosphate fertilizer by mixing with peasant fertilizer and quick-acting phosphate fertilizer. Lack of utilization of phosphate fertilizer In recent years, although the rapid development of China’s fertilizer production, but mainly nitrogen, phosphorus deficiency, less potassium. In 1978, the chemical fertilizers produced in the United States had a ratio of 1: 0.75: 0.20 for NPK, 1: 0.62: 0.92 for the Soviet Union, and 1: 0.135: 0.002 for China. If calculated according to the total amount of fertilizer effective nutrients per acre of cultivated land, the United States in 1978 was 13.3