Effects of the Combined Application of Organic Fertilizer and Calcium Fertilizers on Characteristics of the Calcium Leaching,Migration and Transformation in the Aeolian Sandy Soil of Coastal Farming

Under the moderate-intensity rainfall conditions, soil column leaching simulation was used to study the effects of the combined application of pig manure and shell powder or rice hull ash(RHA) calcium on characteristics of the calcium leaching, migration and transformation in the vertical aeolian sandy soil of coastal farming. The result showed that the calcium leaching was stronger, and the main forms of calcium leaching were the water-soluble calcium and adsorption calcium under 60mm of rainfall conditions. Sand soil mixed pig manure can reduce calcium fertilizer leaching, but the leaching rate was still up 79.8% to 83.1% and the leaching rate of the combined application of shell powder calcium was higher than that of RHA calcium. In addition, a moderate-intensity rainfall can make the surface shell powder calcium concentrate in the 10-15cm and migrated depth to 15 cm or 20 cm of soil, while make RHA calcium concentrate in the 15~20cm and migrated depth of 20 cm below of soil. 12.31% to 14.6% of the remaining calcium was transformed into the adsorption of calcium, and 4.7% to 5.8% of the remaining calcium exited in the water-soluble calcium form, while only a very small part of less than 0.6% was converted to non-acid-soluble calcium and non-exchange calcium.