BASIC INVESTIGATIONS 



Ala. Causes of Variability in the Activity of Herbicides . To (1) 



study effects of the following on activity of herbicides: a. en- 

 vironmental factors, b. plant factors, and c. non-herbicidal 

 agents, as spreaders, stickers, and other agents ; and (2) search 

 for new herbicides, looking for a specific type of chemical to 

 break a link in reproductive or vegetative cycle of a particular 

 weed. 



Bot. $U£ (S-18) 



Calif. Physiological and Biochemical Studies on Weed Control . (1) 

 Continue work on reaction of new herbicides in soils as pre - 

 emergence materials in a number of crop and weed species; observe 

 soil reactions; study breakdown in soils. (2) Continue studies 

 on relation of composition of clays to fixation of herbicides. 

 (3) Conduct soil tests on a number of new chemicals. (U) Study 

 role of light, nutrition, temperature, and humidity in plant 

 response to herbicides. 



Bot., Agron., Veg. Crops 883 



Calif. The Anatomical and Physiological Responses of Woody Species 

 to Herbicides . A Program of Brush Control for California . To 



(1) study toxic action of chemicals on woody plants in relation 



to plant structure, age, seasonal growth and environmental factors; 



(2) make physiological studies for species tolerance, mechanics 

 of absorption, translocation into roots, and biochemistry of 

 killing action; and (3) make exploratory work with new materials. 



Bot. liiOO 



Calif. The Translocation of Herbicides in Plants . The Use of 



Radioactive Isotopes and Other Indicators to Study Absorption 

 and Distribution of Herbicidal Chemicals . To (1) study rela- 

 tion of molecular configuration to absorption and translocation 

 of herbicides, (2) determine when applied chemical enters the 

 plant and in what quantity, and (3) know their ultimate dis- 

 tribution with respect to vulnerable meristematic tissues. 

 Bot. 11*30 



Calif. Effects of Fumigants, Insecticides, and Herbicides on Soil 



Productivity . Learn (1) influence of soil properties and various 

 soil management practices on effectiveness of fumigants, in- 

 secticides, and herbicides; (2) effect of fumigants, insecticides, 

 and herbicides on chemical, physical, and microbiological prop- 

 erties of soil with special reference to soil productivity. 

 Soils, PI. Nutr., Ent. 1^32 



