Maine Physiological Investigations of the Potato Plant , 



(1) Study effects of growth substances; macro and micro nutri- 

 ents, and other chemicals on tuberization, differential nutri- 

 tion, and other undefined interactions. (2) Characterize 

 various cation-anion relations as to effects on mode of en- 

 trance, use, metabolic aspects, and interactions thereof. (3) 

 Evaluate effects of restricted on P and K mitigation and 

 tuberization-initiation and differentiation, (h) Study soils 

 in regard to exchange complexes and their association with 

 nutritional aspects. (5>) Increase crop production by applica- 

 tion of fundamental results from above investigations. 

 Agron. hi Coop. NSF 



Nebr. Physiologic Studies of Obligate Parasitism, with Special 



Emphasis on Diseases Caused by Rust . (1) Develop quantitative 

 techniques for: inoculation of obligate parasites, maintenance 

 of host and parasite under controlled conditions, determination 

 of extent of development of parasite. (2) Study specific meta- 

 bolic system responsible for obligate nature of parasitism. 

 (3) Determine metabolic changes in host during, and as result 

 of, infection, particularly changes which may be associated 

 with resistance or susceptibility of host, (h) From 2 and 3> 

 effect an inquiry of possibility of effective chemotherapeutic 

 control of obligate parasites of economic importance. (5) 

 Establish quantitative, rapid and reliable methods for evaluat- 

 ing chemical compounds as possible chemotherapeutants. 

 PI. Path., PI. Physiol., Field Crops £02 



S. C. Physiological Relationships of Clovers . (1) Study physi- 



ology of clovers, involving effects of temperature, moisture, 

 light, and nutrition on establishment, growth, defoliation, 

 seed production and survival of clovers including absorption, 

 translocation, respiration, photosynthesis, chemosynthesis, 

 plant composition, etc. (2) Learn physical interactions as 

 related to incidence and destruction of different diseases. 

 (3) Develop screen methods and techniques to obtain resistance 

 to unfavorable environmental factors and for freedom from un- 

 desirable plant constituents giving objective to breeding, 

 culture, management, and seed production research. 

 Bot. and Bact. 328 Coop. ARS 



Texas Spraying Equipment for the Control of Cotton Insects and 



for Defoliation . To (1) improve spraying equipment in efforts 

 to obtain better destribution of chemicals for control of pink 

 bollworm; (2) determine nozzle type, arrangement and spacing 

 to give optimum spray patterns for insect control including 

 pink bollworm and for defoliation of cotton plants; and (3) 

 check insect infestations to determine effectiveness of in- 

 secticidal applications with various types and arrangements 

 of nozzles on booms and effects of chemical removal of foliage 

 of cotton on full populations of insects, especially over- 

 wintering of pink bollworms in unharvested material. 

 Agr. Engin., Ent. 722 



