Studies on dynamic variations of nutrient element content in branches and leaves during f lower bud differentiation of 'Tianhong 2' apple
The changes of 10 mineral elements in the leaves and branches of short and medium branches with different rootstocks during flower bud differentiation in'Tianhong 2'apple were studied.The results showed that there was no difference in flowering rate of'Tianhong 2'apples during the stable yield stage,and the changes of mineral elements in leaves and branches were similar whether they were grafted on SH40 interstocks and vigorous stock.During the whole flower bud differentiation period,the contents of nitrogen,phosphorus,potassium,manganese,boron and zinc(short branch)in leaves showed a downward trend,calcium content showed an upward trend,copper content showed fluctuation,and iron content showed a down-up-down-up change;the contents of nitrogen,potassium,magnesium,manganese,boron and zinc(medium branch)in branches showed a downward trend,phosphorus and calcium content showed an upward trend,and iron content showed an up-down-up change.The contents of nitrogen,phosphorus,calcium,magnesium,iron,boron and zinc exhibited higher levels in leaves compared to branches,while the contents of calcium,copper and zinc displayed lower levels.The contents of nitrogen,phosphorus,calcium,magnesium,iron,boron and zinc were higher in branches of short branch with high flowering rate compared to those in branches of medium branch with low flowering rate.The contents of calcium,magnesium and copper were higher in leaves of short branches than those in medium branches.
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