Pa. The Absorption and Translocation of Chemicals by Healthy 



and Oak Wilt-Disease Trees , (1) Compare ability of oak wilt- 

 infected and non-infected trees to absorb chemicals applied 

 to stumps and intact trunks, and to elucidate the factors in- 

 volved in absorption of these substances. (2) Compare ability 

 of infected and non-infected trees to move and trans-locate 

 foreign chemicals within stumps, roots and stems, following 

 application of these substances. 



Bot. and PI. Path. llltf-D (NE-2S) 



Transpiration and Water Relations 



Ark. Supplemental Irrigation Investigations with Horticultural 



Crops . To (1) study influence of varied water sources on soil 

 condition and crop response with particular reference to 

 sources with high salt content, and determine if such waters 

 can safely be used under any conditions of horticultural pro- 

 duction; (2) measure value of supplemental irrigation in terms 

 of yield and quality of horticultural crops now generally pro- 

 duced in Arkansas; (3) determine if supplemental irrigation 

 can be used in developing production of new horticultural 

 crops in Arkansas; and (h) study possible changes that may be 

 needed in management program of irrigated crops, such as 

 planting dates, varieties, and disease and insect control. 

 Hort., For. 310 



Ark. Studies of Physiological Factors that Influence Water 



Needs and Use in Production of Horticultural Crops . To (1) 

 study methods of determining soil moisture in an attempt to 

 find or develop a reliable and efficient technique for use 

 in studies and for grower use; (2) determine range of avail- 

 fable soil moisture permitting optimum growth and fruiting of 

 plants, and if this range varies for different stages of plant 

 development j (3) determine relation between nutrient use and 

 moisture ranges for horticultural crops; and (U) study rela- 

 tion between temperature, optimum soil moisture range and 

 frequency of water application. 

 Hort., For. 388 



Ark. Studies of Physiological Factors Affecting the Growth of 



Agronomic Crops Grown Under Irrigation . To (1) determine 

 critical time intervals of moisture stress which may affect 

 yield and quality of certain selected agronomic crops (2) 

 learn water needs of agronomic crops under varied levels of 

 soil fertility, moisture conditions and stages of plant growth. 

 (3) learn effect of supplemental irrigation on date and length 

 of fruiting periods, maturity date, yield, and composition of 

 agronomic crops, (U) study effect of soil and air temperatures, 

 and relative humidity as modified by supplemental irrigation 

 on physiological responses of the agronomic crops, and (5>) 

 learn possible effects of deposits of Fe and Mn from sprinkler 

 applied irrigation water upon the physiology of some agronomic 

 crops. 



Agron. 392 



