关键词: 积累, 积累

Abstract:

Taking two years ‘Cuiguan’ pear tree as material, test nine elements’ annual change of different organs of it. Analysis was made at the relationships among these elements. Results showed that: (1) At the beginning of growth, content of N, P, K and Mg declining in every organ. In the middle phase, they got more first and then less down. Finally phase, they went upward. (2) Ca, Mn and Zn increase at first. In the middle phase, they nearly had no change in roots, trunks and branches. And in leaves, Ca and Mn increased and then decreased, and Zn got the opposite trend. In the last phase, they all rose in all parts. (3) Content of Fe and Cu showed a rising to peak and slashing down similarly liked normal distribution both in roots and trunks. At the beginning, Fe and Cu in branches got lower after increased. Fe content increased, while Cu content decreased in shoots and leaves. In the middle phase, Cu went up first and then down in branches, while Fe didn’t get much change. Both Fe and Cu got little change in branches and leaves. In the last phase, their content increased in most of parts, except Fe in roots which declined. In the annual orchard management, we suggested paying more attention to the nutrition storage before the trees’ nutritional growth start, and moderately adding supplementary fertilizer in the middle term.