美国东北地区的多数永久草地由于缺乏豆科牧草及土壤酸性的不利影响,生产率很低。为提高这类草地的生产率,引种豆科牧草如:红三叶和白三叶等,给牧草的生长创造良好的条件,是促进牧草旺盛生长的有效措施。该实验研究了白三叶种子的石灰包衣和混合肥料(硼、铜、钾、镁、钼、磷、硫和锌)对四种蒙佛特永久草地的酸性土壤 Most permanent grasslands in the northeastern United States have low productivity due to a lack of adverse effects of legumes and soil acidity. In order to improve the productivity of this kind of grassland, the introduction of leguminous forage such as red clover and white clover, etc., to create good conditions for the growth of forage grass is an effective measure to promote vigorous growth of forage grass. This experiment investigated the effects of lime-coated and mixed fertilizers (boron, copper, potassium, magnesium, molybdenum, phosphorus, sulfur and zinc) of white clover seeds on four acidic soils