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IIr
玉米田化学除草现状及发展趋势r
目录r
摘要……………………………………………………………………………………………IAbstract………………………………………………………………………………………II1前言…………………………………………………………………………………………111丰宁县情基本情况…………………………………………………………112玉米加工和深加工情况………………………………………………………………113本文研究的主要内容…………………………………………………………………22丰宁县化学除草现状………………………………………………………………………221玉米田杂草发生与气候因素…………………………………………………………222玉米田种植分布情况………………………………………………………………323使用除草剂的药害症状主要表现……………………………………………………324产生药害的主要原因…………………………………………………………………4241用药量过大………………………………………………………………………4242操作不标准…………r