JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Weed Science Society of America and Allen Press are collaborating with JSTOR to digitize, preserve and extend access to Weeds. WALKER: SUBSTITUTED UREAS AS AQUATIC HERBICIDES paraquat at the time of seeding. Without exception, seed yields were higher on plots receiving the two applications than on those plots receiving only the original treatment, probably due to the complete freedom from weed competition during early establishment.The cost of the herbicide treatments compared in this trial would range from $6.00 to $9.00/A if one application was made, or from $12.00 to $16.00/A if two applications were made. Prices quoted for Merion bluegrass in 1964 range from $.80 to $1.00/lb. Thus, a yield increase of 6 to 20 lb/A would pay for the cost of the herbicide used in such a program. When the seed yield of all plots, covered and non-covered alike, receiving one herbicide treatment were averaged, the seed yield was 875 lb/A as compared to 870 for the mechanically prepared plots. The average seed yield on those plots which received the second treatment at seeding time was 1050 lb/A compared to 870 pounds for the mechanically prepared plots. From a yield standpoint alone, the use of herbicides as aids in stand establishment would be a sound investment. Premium prices paid for high quality seed would increase the income from use of this method, in addition to the long range benefits derived from improved stands, and reduced risk of stand failure.All of the herbicide treatments applied January 14, 1963, gave satisfactory weed control. As far as can be (letermined, all herbicide treatments gave comparable seedl yields. If a grower were to select a treatment from those compared, cost would be the main consideration in the selection. If a second treatment were applied at seed-ing time, either diquat of paraquat could be used. However, paraquat has shown much better grass control than diquat at comparable rates of application and would be preferred if available. ACKNOWLEDGEMENT
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