HA—Si型长效复合肥由辽宁省果树所研制,系国家化工部下达的“八五”重点科研项目,是继腐殖酸之后的第二代新产品。经1988～1992年,在辽宁、吉林、宁夏、内蒙古4省区大面积示范推广,证明该肥在研究上取得了重大突破,居国内外领先地位,达到了国际同类产品先进水平。 HA-Si long-acting compound fertilizer developed by Liaoning Provincial Fruit Tree is a key scientific research project under the “Eighth Five-Year Plan” issued by the State Ministry of Chemical Industry. It is the second generation new product after humic acid. After 1988-1992, large-scale demonstration and promotion in four provinces and regions of Liaoning, Jilin, Ningxia and Inner Mongolia proves that the fertilizer made major breakthroughs in research and has taken the lead both at home and abroad and reached the advanced level of international similar products.