劣种梨园改接优良品种见成效招远市现有梨园１２００ｈｍ２（公顷），其中四楞子、红宵梨等劣种占４５．９％。为更新品种，自１９８１年起在张星、辛庄、宋家等乡镇重点产梨村，进行了改接换头，效果良好，现总结如下。改接母树为１４～２３年生树，原品种为四楞子、红宵... Bad varieties of pear orchards changed the elite varieties to see the effectiveness Zhaoyuan existing pear 1200hm2 (hectare), of which four sturdy child, Hongxiao pear accounted for 45.9% of the poor. In order to update the varieties, since 1981, Zhang, Xinzhuang, Song and other key townships in the village of pear production, changed the head, the effect is good, are summarized as follows. Change to the mother tree for 14 to 23 years old tree, the original varieties of four sturdy, red ...