凤城市位于辽宁的东部山区,耕地面积93万亩,全国第二次土壤普查结果表明:全县耕地土壤呈微酸性到酸性,PH值在5.1-6.9之间,其中有15.6万亩耕地土壤PH在5.5以下,占耕地面积的19.2%。这类土壤是我县的中低产田之一,种植玉米平均单产150-250公斤。改良这类土壤使其地产变中产,是提高我市粮食产量的有效途径。这类土壤低产的主要原因是土壤过酸不利于有益微生物的活动,影响有机质的矿化率。几年来试验利用 Fengcheng City is located in the eastern mountainous area of ​​Liaoning Province, with an area of ​​930000 acres of arable land. The results of the second national soil survey indicated that the arable land in the county was slightly acidic to acidic with a PH value of 5.1-6.9, of which 156,000 mu Below 5.5, accounting for 19.2% of arable land. This kind of soil is one of the middle and low yield fields in our county. The average yield of corn is 150-250 kg. Improving soil so that its real estate into a middle class is an effective way to increase grain output in our city. The main reason for the low yield of these soils is that soil over-acid is not conducive to the activities of beneficial microorganisms and affects the mineralization rate of organic matter. Years of experimental use