Over bearing trees of last year showed the smaller number of the rosulate leaves and lower Percentage of fruit set than that of lower yielding trees.

上年的高产树，翌年花序初生叶叶片数量少，叶面积小，座果率低。

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It is necessary to build bases of oleoresin production, select high gum-yielding trees for planting, spread advanced tapping technology and introduce intensive management.

要改变这一状况，必须建立松脂生产基地，选育高产脂力良种，推广先进采脂技术，实行集约化经营。

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Trees and shrubs yielding a fragrant oil.

产出芳香的油脂的乔木和灌木科。

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And for the 1.5 million cocoa farmers in Ghana, each with only a few acres, profit margins are still too low to encourage more investment in fertilizers, pesticides and higher-yielding trees.

CNN: Ghana cocoa industry at crossroads