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我国于1979年开始。在全国范围内开展了第二次土壤普查工作。据第二次土壤普查技术规程要求,把土壤养分点位图(土壤养分图)当作土壤普查成果之一进行验收。土壤养分点
My country started in 1979. A second national soil census was conducted nationwide. According to the second soil census technical regulations, soil nutrient point map (soil nutrient map) as one of the results of soil census acceptance. Soil nutrient point