Seasonal Variation of Mineral Elements in Different Organs of Suli Pear

The mineral elements in organs of Suli pear had been measured throughout the seasons.The results showed that the content of N,P,K,Cu in the leaves decreased with the increase of leaf age,while the content of Ca,Mg,Mn increased with the increase of leaf age.The content of N,Ca in the shoots reduced over the whole growth period,and the content of P,K decreased first and increased later.While the content of Mg and Mn increased gradually,the content of Cu changed largely and all the content of N,P,Ca,Mg,Mn,Cu in fruits manifested a decreasing tendency along with fruit expansion.