23 



R. I. Factors Affecting the Control of Nutgrass with Substituted 

 Ureas"]~Alone, or in Combination with Other Herbicides . To (1) 

 determine to what extent soil pH, fertility and moisture in- 

 fluence time needed by substituted ureas to eradicate nutgrass; 

 (2) find how these factors affect duration of residual toxicity; 

 and (3) discover if other herbicides such as phenyl mercurials 

 will enhance effectiveness of the substituted ureas. 

 Agron., Agr. Chem. 20U (NE-12) 



R. I. Water Soluble Mercurials and Other Chemicals for Crabgrass 

 Control , To determine a satisfactory chemical method of crab- 

 grass control. 



Agron., Ent., PI. Path. 209 



R. I. Evaluation of Chemicals and Other Means for Controlling Weeds . 

 To determine (1) effectiveness of pre- and post-emergence treat- 

 ments for weed control, and (2) fundamental effects of herbicides 

 and other means on weeds and crops. 

 Agron., Hort. 211 



S. Dak. Weeds and Weed Control . Develop and improve cultural methods, 

 chemical methods and a combination of 2 methods for controlling 

 weeds on cultivated land, grassland, and other uncultivated land; 

 investigate new chemicals that may have herbicidal properties; (2) 

 study physiological, morphological, and agronomic responses of 

 weeds and agronomic crops to herbicides as: factors affecting 

 crop yield and biochemical response of weeds. (3) Learn differences 

 in growth habits, means of propagation and physiological activity 

 of weeds as: activity of vegetative buds; factors influencing devel- 

 opment, maturation, and germination of weed seeds. (U) Cooperate 

 with other experiment stations and USDA. 

 'Agron. 32 (NC-10) 



Term. Chemical Weed Control . (1) Develop satisfactory methods for 

 control of weeds in row crops and close growing crops, control of 

 specific weeds including brush and trees, and soil sterilization 

 where control of all vegetation is desired. (2) Evaluate equip- 

 ment and methods for herbicide application. 

 Agron., Agr. Engin., Hort. 32 



Texas Control of Field Bindweed ( Convolvulus arvensis ) and Blueweed 

 ( Helianthus ciliaris ) and Similar Broadleaf Weeds in the Sub-humid 

 Farming Areas of Texas" Develop and improve chemical and cultural 

 practices for efficient and economical control of sub-humid peren- 

 nial broadleaf weeds under a range of climatic and cropping conditio 

 Agron. 686 



Texas Control of Johnsongrass and Annual Grasses in Texas . (1) 



Perfect current methods and develop more effective and economical 

 new practices for controlling established Johnsongrass. (2) Develop 

 more acceptable methods for controlling Johnsongrass and annual 

 grass seedlings under various agricultural and other situations in 

 the State. 



Agron. 19h Coop. USDA 



