1 项目来源及指标要求“八五”期间省农业厅立项下达我县中低产田改造任务0.73万 hm~2,其中重点示范面积0.15万hm~2。要求试点区在改造前3 a 粮食平均产量的基础上,“八五”末粮食平均产量提高525～750 kg/hm~2,土壤耕层有机质含量提高0.5～1.0 g/kg,全氮提高0.05～0.10 g/kg,速效磷提高1～3 mg/kg,耕层厚 1 Project Source and Indicators Requirements During the “85” period, the Provincial Department of Agriculture approved the assignment of 7300 hm ~ 2 in medium and low-yielding fields in our county, of which the key demonstration area is 0.15 million hm ~ 2. On the basis of the average grain output in the first 3 years of the pilot area, the average grain output at the end of the “85th Five-Year Plan” was increased by 525-750 kg / hm ~ 2, the organic matter content in the topsoil was increased by 0.5-1.0 g / kg, Increased 0.05 ~ 0.10 g / kg, available phosphorus increased 1 ~ 3 mg / kg, thick layer