26 



Ecology of Rabbitbrush (Chrysothamnus spp.) as a Basis for 

 Control of Eastern Oregon Ranges , To obtain data pertinent to 

 control of rabbitbrush on range lands of eastern Oregon. 



Anim. Husb., Agr. Econ., Farm Crops, PI. Path. 160-8 (W-ll) 



The Ecological Relationships, Economic Aspects and Chemical 

 Control of Coyotillo in Texas" ! Learn (1) impact coyotillo has on 

 ranch industry in terms of classes of livestock lost, season of 

 loss, management and control used by operators on infested pas- 

 tures; (2) distribution, plant associations, and related ecological 

 factors; (3) by lab and field experiments, method/s most effective 

 for chemical control. 



Range and For. 608-1 



MACHINERY FOR WEED CONTROL 



Grass and Weed Control . To evaluate and improve machines and 

 methods (1) for disposal of crop residues in mechanical cotton 

 production, (2) for planting cotton in mechanical cotton produc- 

 tion, (3) for control of weeds in mechanical cotton production; 

 and (U) for preparing cotton crop for mechanized harvest. 



Agr. Engin. ± PI. Path* 858 (See S-2 in Part 3, Section b) 



Design and' Development of Equipment and Methods for Weed 

 Control . To (1) learn by lab or field tests, factors which affect 

 operating characteristics of machines or machine elements used in 

 all methods of weed control; (2) design and develop new machines 

 or machine elements or improve available equipment; (3) formulate 

 recommendations on proper use of weed control equipment; and (h) 

 conduct lab or field tests to learn performance of weed control 

 equipment. 



Agr. Engin. 1208 Coop. USDA 



Equipment and Procedures for Control of Weeds and Brush . 

 Develop systems and equipment for control of weeds in (1) field 

 crops, (2) horticultural crops. Design, develop, and test equip- 

 ment for (3) weed control in pastures, (U) brush control on agri- 

 cultural lands, rights-of-way, and commercial areas. (5) Develop 

 more accurate and efficient methods of applying chemical herbicides, 



Agr. Engin. 153 Coop. USDA 



Development of Improved Methods and Equipment for Planting , 

 and Weed Control in Cotton Production !! (1) Develop or modify a 

 planter which will: plant at a uniform depth, prevent dry soil 

 from depositing around seed; prevent void space from remaining 

 in soil around seed; reduce lateral placement of seed to a 

 minimum. (2) Evaluate effectiveness of planter under different 

 weather and soil conditions. (3) Learn effect of plant spacing 

 on yield and mechanical harvesting efficiency, (h) Develop or 

 modify equipment and methods for complete weed control. (5) 

 Learn picking efficiency of various harvesting machines and 

 techniques. 



Agr. Engin. U2 (See W-2I4. in Part 3> Section b) 



