Abstract:

After monthly sample and analysis the eleven nutrient elements such as Nitrogen,Phosphor,Potassium,Calcium,Magnesium,Sulfur,Iron,Manganese,Cuprum,Zincand Boron contend in Jinhuang mango leaves in Sanya in Hainan for a whole year.The results shown as follows:⑴The annual average nutrition content in Jinhuang mango leaves are N>Ca>K>Mg>P>S>Mn>Fe>B>Zn>Cu,and the content of Nitrogen,Calcium in higher levels , the content of Phosphor,Magnesium,Sulfur and Zinc in leaves fluctuated slightly.⑵We can divided the whole growth cycle of Jinhuang mango to four phases:vegetative growth phase,which is from May to September;reproductive growth phase,which is form September to December;fruit enlargement phase,which is from December to February;fruit maturation phase,which is from February to April.The change rules are not the same in different phases:during the vegetative growth phase,the content of all nine nutrient elements in leaves increased but Potassium, Cuprum declined;during the reproductive growth phase,the content of Nitrogen,Boron,Calcium in leaves increased,and the other declined;during the fruit enlargement phase,the content of Nitrogen,Potassium,Iron,Zinc,Boron in leaves declined,the content of Calcium,Manganese,Cuprum in leaves increased;during the fruit maturation phase,the content of Nitrogen,Manganese,Iron,Boron,Cuprum in leaves increased in different degrees,the content of Potassium, Calcium in leaves declined.