31 



Ind. Factors which Influence the Yield of Cool Season Grasses . 



(1) Learn relative vigor of regrowth of bromegrass when har- 

 vested at low and high fructan levels. (2) Study rate of 

 accumulation of fructan in grass as affected by temperature, 

 time of N fertilization with respect to harvesting, and soil 

 moisture. (3) Learn nature and extent of fructan depletion in 

 cool season grasses during and following anthesis. 

 Agron., Statis. 837 



Iowa Soil and Climate Factors Affecting the Efficient Use of 



Water by Crops . To (1) learn moisture properties of Iowa soils 

 (moisture holding capacity, wilting point, available soil 

 moisture), (2) learn evapo-transpiration of different major 

 crop covers on different soils under different weather con- 

 ditions (particularly on corn), (3) investigate rate of re- 

 plenishment of soil and subsoil moisture in relation to 

 climate-crop factors, rainfall, evapo-transpiration, runoff, 

 crop cover, and mulch, (U) develop a technique for estimating 

 soil moisture over large areas from meteorological data and 

 from limited soil moisture samples, (f>) learn optimum soil 

 moisture range for crop growth at different growth periods, 

 under different air temperature conditions, (6) obtain moisture 

 data at specific locations and times, for use in agronomic 

 interpretations, and (7) 'learn root distribution and develop- 

 ment under different subsoil moisture conditions. 



Agron., Agr. Engin., Soil 1276 Coop. ARS, USDC-WB 



Ky. Physiological Investigations of Red Clover . Obtain basic 



physiological information which will aid in improvement of red 

 clover. 



Agron., PI. Physiol. 171 Coop. USDA 



La. The Effects of Different Lengths of Dormant Period and 



Certain Chemicals upon the Emergence, Productivity and Storing 

 Ability of Several Varieties of Potatoes . To (1) try to deter- 

 mine reason for different varieties having different rest 

 period needs and interaction between rest period requirements 

 and productivity of each variety; and (2) ascertain effect of 

 certain growth regulators, applied as both pre-harvest and 

 post-harvest treatments on storage ability and quality of 

 standard varieties of potatoes. 

 Hort. 393 



Mich. The Interrelation of Environment (Temperature and Relative 



Humidity) and Spray Chemicals on Russeting, Luster, Color and 

 Ripening of Apple Fruits and on Physiology of Apple Leaves . To 

 determine (1) environmental conditions and time during flower and 

 fruit development that fruit russeting is most likely to occur 

 from use of chemicals; (2) if injury to epidermal cells of flower 

 and fruit is necessary for occurrence of russeting by pesticide 

 chemicals; (3) relation between apple varieties and injury from 

 various chemicals as influenced by temperature and humidity; and 

 (U) interrelation of plant regulators used to control pre-harvest 

 fruit drop and night and day temperature on rate of fruit ripening. 

 Hort. 116 



