11 



Wash. X-Rav Spectrographv of Soils and Sediments, (l) Apply the 



X-ray spectrographic method to the elemental analysis of soils and 

 sediments; and (2) test elemental ratio method as a replacement 

 for petrographic determination of resistant minerals as indicators 

 of genetic relationships between horizons. 

 Agron. 1374 



W. Va. The Correlation Between Various Laboratory Methods of De- 

 termining available Nitrogen in Northeastern Soils and the 

 Responses to Added Nitrogen of Crops Gr own on Th ese Soils in 

 Greenhouse and Field Studies, (l) Examine and develop lab. 

 methods for learning ability of soils to supply N to plant 

 through growing season; (2) correlate results of lab. analysis 

 for available N with responses obtained from crops to added N, 

 when grown in greenhouse; and (3) where lab. and greenhouse 

 studies warrant, make field studies of response of crops to 

 added N. 



Agron. and Genet. 112 



C. Mineralog y 



Ark. Interrelationships Between the Mineralogical. Physical and 



Chemical Properties of Representative Arkansas Soils. To (1) 

 separate clay and organic matter fractions from agriculturally 

 important soil series, also identify and characterize the various 

 cOTiponents of these soils by determination of mineralogical and 

 chemical composition of the inorganic and chemical composition 

 of the organic portions; (2) leam physical properties of the 

 selected soils and characterize their affect upon growth and 

 development of plants; (3) leam fundamental factors responsible 

 for development and maintenance of physical conditions in soils 

 vrtiich may be detrimental or beneficial to plants. Examine role 

 of components in soils that may affect psins. dense layers, 

 cemented layers, and/or dispersed soils; (4) leam exchange 

 properties of constituents of selected soils by means of clay 

 membranes and ion exchangers and investigate ionic interrelation- 

 ships of pure, separated, and combined constituents; and (5) 

 leam exchange properties and ionic interrelationships of 

 plant roots to correlate nutrient uptake of plants with ionic 

 interrelationships and physical behavior in soil environment in 

 greenhouse and field. 

 Agron. 342 (S-14) 



Calif. A Study of the Colloidal Constituents of Calif omia Soils. 

 To study (1) amounts, distribution, and kinds of colloidal sub- 

 stances found in representative California soil profiles; (2) 

 chemical composition; (3) X-ray analysis and crystal structure; 

 (4) optical properties; (5) ion exchange properties; (6) moisture 

 relations and dehydration properties; and (?) effect on plant growth. 

 Soils, Plant Nutr. 836 



