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保持农田生态平衡,防治早稻生理性黄叶病——以在桂南蹲点和调查为例
侯学煜;
中国科学院植物研究所
摘要:
一、前言 首先应该说明早稻叶片出现黄色的现象和原因是多种多样的。有的只有新叶或第一片叶先发黄,引起这种发黄的原因,常是由于水稻植株基部被三化螟所咬,出现枯心苗。有的是由于过量喷撒六六六农药所致,不管新叶或老叶,凡接触过多药粉的部分呈不规则的发黄。还有的是拔秧时由于稻根受伤,插秧初期暂时既难从地下部分吸收养料,也缺乏从老叶转运养料的能力,这时嫩叶和老叶不能维持生活,都可相继变桔黄而死。还有的是施用秧根肥过
关键词:  早稻品种  稻黄叶病  稻根  农田生态  老叶  枯心苗  新叶  露田  叶先  土壤养分供应  
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