-25- 



Okla. The Physiology of Seedling Vigor and Cold Tolerance in 



Cotton , (lj Develop procedures in cooperation with plant breed- 

 ers to select for cold tolerance & vigor in germinating seed, 

 seedlings, & maturing plants. (2-5 To learn) (2) metabolic 

 factors controlling the degree of vigor under cold conditions 

 & how related to germination, to post seedling development, & 

 vigor; (3) how phases of environment & nutrition affect these 

 responses to cold; (4) effects of applied chemicals as growth 

 regulators on cold responses; (5) by cooperating with path- 

 ologists, the relationships between seed reactivity & vigor & 

 susceptibility or resistance to seedling disease organisms & 

 see how use of fungicides affect such relationships. 

 Agron. 923 



Tex. Spraying Equipment for the Control of Cotton Insects and 



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

 to obtain better distribution of chemicals for control of pink 

 bollworm; (2) determine nozzle type, arrangement & spacing to 

 give optimum spray patterns for insect control including pink 

 bollworm and for defoliation of cotton plants; & (3) check in- 

 sect infestations to determine effectiveness of insecticidal 

 applications with various types & arrangements of nozzles on 

 booms & effects of chemical removal of foliage of cotton on 

 full populations of insects, especially overwintering of pink 

 bollworms in unharvested material. 

 Agr. Engin., Ent. 722 



Tex. Mineral Nutrition of the Cotton Plant . To (l) obtain 



basic information on a. role of sodium in nutrition of cotton 

 plant, b. interactions between Na & major nutrient cations with 

 special emphasis on Ca & K, & c. growth & development of cotton 

 plant & changes in organic constituents as influenced by nutrient 

 treatments; (2) study absorption, distribution, & accumulation 

 of Mg by cotton & learn specific needs of cotton for Mg regard- 

 ing amount, season, & supply of other nutrients; & (3) study 

 influence of deficiencies & excesses of various nutrients on 

 plant vigor, yield, & disease resistance. 

 PI. Physiol., Path. 916 Coop. ARS 



