万全县土壤养分现状对比分析与建议
XIANDAI NONGCUN KEJI（2011）
Abstract
<正>万全县地处河北省西北部,辖11个乡镇,173个行政村,是张家口的农业大县。但随着农业生产水平的不断提高、作物品种的不断更新和高产品种的广泛应用、肥料用量的持续增长,万全县的土壤
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