Relationship between Salt and Nutrient Content of Soil and Growth of Casuarina in Fujian Coastal Region

Typical investigation showed that for salinized soil on seashore,after more than 40 years' cultivation,the salt content have been reduced to0.1%,which is no longer harmful for the growth of common trees.However,the soils remain alkalescency,influencing the growth of some species of trees sensitive to alkali soil.Recently reclaimed coastal clayey salinized soil contains 0.5%~0.8% of salt,belonging to heavy salinized soil;and sand soil influenced by sea water contains 0.3%~0.4% of salt which are not harmful for the growth of Casuarina.For coastal sand soils,after a generation of Casuarina cultivation,the soil nutrients were depleted.Phosphours application significantly promoted the growth of Casuarina and enhenced the concentration of N,P,K and Mn in leaves.