Miss. Studies on the Effect of Herbicides on Weeds and Crops . To 

 (1) study absorption, translocation and certain physiological 

 actions of selected herbicides in appropriate plant species; (2) 

 study histological and cytological responses of cotton and per- 

 haps other species to selected post-emergence herbicides and seek 

 to determine if differences in internal and external morphology of 

 certain species are responsible for differential responses to some 

 herbicides; (3) determine movement pattern, persistence, and action 

 on crop species of herbicides in different soils; (k) evaluate in- 

 fluence of climatic and soil factors upon vapor activity and herbi- 

 cidal action of promising herbicides; and (5>) evaluate effects of 

 new herbicides upon selected crops and weeds and develop practical 

 methods for safe use in controlling weeds on cropland and other 

 areas. 



PI. Path. RRFL-1 (S-18) Coop. USDA 



Miss. The Residual Effect of Various Herbicides on Cotton and 



Other Crops . To (1) determine rate of disappearance of certain 

 herbicides from soil under field conditions; and (2) evaluate 

 effects of these herbicides on crop and weed plots under varying 

 soil conditions. 



PI. Path. RRFU-3 (S-18) 



Miss. Studies of the Effects of Herbicides upon Weeds and Crops . 

 To (1) study physiological action of herbicides upon crops and 

 weeds; (2) determine influence of climatic, bio tic and edaphic 

 factors on action of selected herbicides; (3) determine effects 

 of herbicides on soils and plant succession following their use; 

 and study their movement patterns in soils; (li) evaluate effects 

 of new herbicides upon selected crops and weeds; (£) develop 

 agricultural usages and practical methods of employing herbicides 

 for controlling weeds selectively in crops and grasslands, ponds, 

 orchards, etc.; (6) develop methods of employing herbicides for 

 non-selective control of weeds in non-agricultural areas; and 

 (7) develop, adapt, and evaluate equipment for accomplishing 

 objectives (5) and (6). 



PI. Path. PL-18 Coop. USDA 



Mont. Factors' Affecting Sagebrush (Artemisia tridentata Var. 

 Tridentata nutt.) Seed Germination.' To determine effect of 

 temperature, moisture, and other factors on the capacity of sage- 

 brush seed to germinate, in order to develop a sounder basis for 

 prediction of success of artificial measures leading to the re- 

 duction of sagebrush stands. 



Agron. & Soils, Bot. & Bact. 107, MS 92k (See W-25 in Part 10) 



Mont. Physiological and Ecological Factors Influencing the Life 

 Cycle of the Wild Oat (Avena fatua) as Related to Control . T~o 

 (1) determine factors which influence dormancy, germination and 

 longevity in wild oat seed; and (2) develop methods of reducing 

 the wild oat seed population in cultivated soils. 

 Agron. lliO, MS 927 (W-ll) 



