What are the major classifications of herbicides
{"Image DocumentName": "What are the major classifications of herbicides?", "Image ImageDescription": "Timing refers to the stage of the crop or weed development. Preplanting applications are made before the crop is planted to control annual weeds. Preemergence applications are made before the crop or weeds emerge. Postemergence applications are completed after the crop or weeds have emerged.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}