Sulfur,calcium,and magnesium are essential elements in plant and play very important functions in physiology and plant nutrition.Based on the long-time stationary experiment,the changes of soil sulfur,calcium and magnesium were studied under a condition of 22-year alfalfa succession in Loess Plateau.The results show that the contents of total sulfur,available sulfur,water soluble sulfur,adsorbent sulfur,HCl soluble sulfur,total inorganic sulfur,and organ sulfur in tilth soils,after long-time P-fertilizer ap...
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