oastal sandy soil can not form an aggregate structure (physical sand 92. 11%一93. 33%).The soil is loose (aeration porosity 34. 48%一36. 78%)with sufficient O_2 for thegrowth of Euphoria longana's mycorhiza. The high soil temperature with a wide variation insummer and autumn are harmful to the growth of the longana young roots. Covering the soilwith straw and applying a proper irrigation will protect the young roots from a heat injury。The sandy soil has a high permeability a low moisture holding c...