35 



Factors Affecting Seed Germination Under Tropical Conditions . 



(1) Learn how germination capacity of seeds produced in Puerto 

 Rico is influenced by changes in environmental factors during 

 production and conservation. (2) Develop better techniques of 

 seed production and conservation to secure maximum percentages 

 of germination of seeds used for crop production. 



PI. Physiol. 25 



Effects of Photoperiod on Growth and Development of Tropical 

 Plants . To find any lighting procedures that will make possible 

 the control of growth and differentiation of plants in the 

 tropics and to study light requirements of such plants in relation 

 to other environmental factors. 



PI. Physiol. 52 



The Effects of Certain Atmospheric Effluents upon the Growth 

 and Composition of Plants and upon Animal Life, at Locales in 

 East and Central Tennessee . To ascertain the verity of numerous 

 contentions that the harmful effect upon growth and composition 

 of crops and the severe effects upon livestock in certain locales 

 are attributable to effluents released from nearby manufacturing 

 operations; to establish the causal factors for any such deter- 

 mined effects; and to propose remedial measures and to demonstrate 

 their efficacy. 



Agron. 50 Coop. TVA 



Maturity and Physiological Responses of Apples as Influ- 

 enced by Fertilization, Spray Practices, Environmental Conditions, 

 Harvesting and Handling . (1) Develop maturity standards for 

 harvesting apples for early market and for cold storage. (2) 

 Learn influence of weather and cultural practices on quality, 

 condition, and storage life. (3) Evaluate influence of spraying, 

 fertilization, harvesting and handling practices on quality, con- 

 dition and storage life. 



Hort. 86006 



Factors Influencing the Growth and Yield of Sugar Maple 

 TreesT (1) Evaluate producing trees as to sap quality and 

 yield and develop methods for selecting high-yielding specimens. 



(2) Survey variability in young maples and study its relation to 

 adult performance in stocks of known and unknown genetical com- 

 position. (3) Evolve sugarbush management practices for cut- 

 over areas and abandoned fields, already supporting stands of 

 young trees. (U) Study role of climatic conditions in influenc- 

 ing productivity. 



Bot. Ul 



