我们大队属黄土丘陵地区。土质较薄,文化大革命前,大豆亩产只有百十来斤。自北方农业会议以后,粮、豆产量大幅度提高,1974年以来,粮食亩产超千斤,大豆连年超《纲要》。在大豆生产上,我们主要采取了以下措施:一、增肥改土前几年,我们对我队的土壤进行过化验,全氮量只有0.088%,有效磷也只有3.4。说明氮素不足。磷素缺乏。为了增肥改土, Our brigade belongs to loess hilly area. Thin soil, before the Cultural Revolution, soybean yield only one hundred pounds. Since the North Conference on Agriculture, the output of grain and beans has risen sharply. Since 1974, the output of grain has surpassed one kilogram and that of soybean has surpassed the “outline” every year. In the soybean production, we mainly take the following measures: First, a few years before the fertilizer increase, we tested the soil of our team with only 0.088% of total nitrogen and only 3.4% of available phosphorus. Nitrogen deficiency. Phosphorus deficiency. In order to increase soil fertility,