Show T 8 New ew Weed Weed Control Being Developed a s w E t i rp p f 1 fit J t t t. t t 1 1 I. I i A cotton field that has been pre pre emergent emergent treated with Chloro Chloro 1 i vs s control of or grass in inch 7 bands on each aide ode of row PITTSBURGH PA Development Development of a new chemical for control of off n f weeds wads s and grasses in field crops soya beans alfalfa vegetables and especially cotton promises an important contribution to the continuing of agriculture Experiments now being conducted with I new herbicide designated Chloro Chloro HC show favorable control of celain ain annual grasses and broadleaf weeds for a variety of crops Of importance to farmers is the tho fact tact that research indicates that it is fa not in plants It selectively retards cell divisions in the primary roo root rooi structures of germinating weed or gross graas seeds and very young p roe For this reason it should be present in hi the soil eoll at gen germination or in the tho very early seedling stage of the weeds to be controlled Effects lot about four to six weeks in th the soil although both longer and shorter periods have be been n reported Soil SoU temperature seems to be the most 1 jm important factor and rainfall secondary The higher the tho temperature the shorter the effective period |