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一、田间观察 (一) 旱害症状与分级根据油棕旱害的严重程度,可分为如下4级: 1级:叶簇中央未展开的枪叶较多(雨季2—3片,旱季增至5—6片);并有1—3片绿叶下垂地面或在中间折断;树冠下部有几片枯叶。
First, the field observation (A) symptoms and grading of drought According to the severity of drought in oil palm can be divided into the following 4: Level 1: leaf clusters central unexploded leaf more (2-3 in the rainy season, dry season increased To 5-6 pieces); and 1-3 pieces of green leaves drooping on the ground or broken in the middle; the lower part of the canopy has a few pieces of dead leaves.