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玉米是我省的主栽作物,近几年来播种面积占全省粮食作物播种面积的40%以上,占全省粮食总产量的50%。这就造成玉米连作和大量施用化肥来增产粮食的局面。尽管产量逐年增加,可是连作和大量施用化肥对土壤肥力的影响却是人们十分关注的问题。目前关于这方面的试验资料尚少。为此,在我省种植玉米面积最多,土壤肥力最高的草甸土上进行了土壤肥力长期定位试验,并进行有机肥料腐殖化系数的砂滤管辅助试验。本文为1980～1982年阶段性总结。仅从土壤养分、有机碳平衡的角度对土壤肥力的变化做些粗浅的探讨。
Maize is the main crop of our province. In recent years, sown area accounts for more than 40% of the sown area of grain crops in the province, accounting for 50% of the total grain output of the province. This resulted in continuous cropping of corn and the large-scale application of fertilizers to increase grain production. Despite the increasing output, the impact of continuous cropping and large-scale application of fertilizers on soil fertility is a matter of great concern. At present, there is little experimental data on this aspect. For this reason, long-term soil fertility test was carried out on the meadow soil with the largest area of maize and the highest soil fertility in our province, and the sand filter assisting experiment of organic fertilizer humification coefficient was carried out. This article is a summary from 1980 to 1982. Only from the perspective of soil nutrients, organic carbon balance changes in soil fertility to do some superficial discussion.