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试验利用60株鸭梨树,分为四组采样,定期测定其叶片及果实的钙素含量。经过两年重复试验发现,叶片中的钙素含量年周期变化表现为从展叶至落叶前不断增加的形式;果实中的钙素含量,从座果至采收其百分浓度表现为降低趋势,尤以盛花后10～30天内降低速度最快;其单果含钙量的增长速率则反映了果实生长的全部时期中钙素都能进入果实,尤以果实生长的中后期为多,90％以上的钙是在盛花后60～140天进入果实的;单果含钙量的增长速率也反映出果实中的钙素可能向树体倒流。单果钙素增长量与其干物重增长呈高度正相关。
Sixty pear trees were used in the experiment, which were divided into four groups to determine the calcium content of leaves and fruits on a regular basis. After two years of repeated trials, it was found that the annual variation of calcium content in leaves showed an increasing form from leaves to deciduous leaves. The content of calcium in fruit decreased from fruit to harvest , Especially in the 10-30 days after flowering the fastest reduction; the single calcium content of the growth rate reflects the full growth of fruit in all of the calcium can enter the fruit, especially in the mid-late growth of fruit more than 90% The above calcium is in the fruit after 60 to 140 days of full bloom; the rate of increase of the calcium content of single fruit also reflects that the calcium in the fruit may flow back to the tree. The increase of calcium content in single fruit was positively correlated with the dry matter weight gain.