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棉花4片真叶期田管核心是促弱、稳壮、控旺。①化控：旺苗亩用缩节胺0.8-1g，壮苗0.5g轻控，弱苗不控。②中耕：深度10-15cm，破除板结、提温促根，头水前2-3次。③水肥：控水蹲苗，弱苗叶施尿素，普喷磷酸二氢钾+锌肥。④病虫：重点防蓟马、蚜虫，兼治苗期病害！#视频三农目瑙纵歌
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