3U 



N. C. Study of Factors Influencing the Effect of Sub-Freezing 



Temperatures on Peach Tree Survival . To learn relationship 

 between (1) rest period and hardiness, and (2) hardiness and 

 growth substances in tree. 

 Hort. 87 



N. C. Winter Hardiness in Woody Ornamental Plants . Learn (l) 



number of applications of N that can be made in a growing 

 season to safely obtain maximum growth and a healthy condi- 

 tion in woody ornamentals, without risk of cold injury caused 

 by fall freezes; (2) effectiveness of different concentrations 

 of raaleic hydrazide in bringing about a hardening of tissues 

 for protection against low winter temperatures; (3) effects of 

 P and K applied on September 1 and October 1 in promoting re- 

 sistance of plants to low temperatures, (h) Compare N sources 

 in relation to plant response; i.e., a source of readily avail- 

 able N (NH[ | N03), and 1 known to release N at a much slower rate 

 (not readily available), Uramite. 

 Hort. 133 



N. Dak. Low Temperature Endurance in Corn . To (1) test and 



evaluate ability of corn inbred lines to germinate and develop 

 in seedling state at sub-optimum temperature; (2) study asso- 

 ciation between a. ability to germinate and grow at sub-optimum 

 temperature and ability to resist slight freezing in early 

 seedling stages; and b. ability to germinate and grow at sub- 

 optimum temperature and some morphological, physiological or 

 pathological character of corn plant or kernel; (3) study 

 effect of environment under which seed is produced upon re- 

 action of progeny grown at low temperature; and (U) study 

 rapidity of germination and ability to produce good stands 

 under adverse, cold, wet soil conditions. 

 Agron., PI. Physiol., Bot. 6-7 



Pa. Light and Temperature Effects on the Growth of Greenhouse 



Roses . To study the effect of various night temperatures in 

 relation to natural light conditions upon the flower production 

 and keeping quality of greenhouse roses. 

 Hort. 1232-B 



Pa. Factors Affecting the Keeping Quality of Cut Flowers . To 



learn (1) effects of chemical preservatives, growth regulators, 

 and pH levels of solution on keeping quality of cut flowers at 

 room temperature; (2) influence of humidity, air temperature, 

 air movement, ethylene, and CO2 accumulation in storage cham- 

 bers on subsequent keeping quality of cut flowers. 

 Hort. 1280 



