Mo, The Fertility Level of Missouri Soils. To clearly comprehend 



the facts of plant nutrition via the soil, in the light of basic 

 principles for better soil management. Attack will be along 3 

 lines; (l) chemodynamics and thermodynamics of nutrient uptake 

 by plants from clay of the soil; (2) nutrient uptake of reserves 

 of primary & secondary minerals in soil to nutrients available 

 and their uptake by crops; and (3) penetration of plant roots 

 according to physical and fertility conditions of deeper soil 

 horizons. 



Soils 207 



N.J. Use of Radioisotope Techniques in the Study of Ma.ior and Minor 



Nutrient Elements in Plants and Soils, (l) Clarify mechanism of, 

 & factors affecting foliar absorption of major & minor plant 

 nutrient elements; (2) study different effects of adding BfeSO^ 

 to different agricultural soils of state; and (3) study efficiency 

 of water use of various plant species receiving irrigation (use 

 radioactive water) • 

 Soils 637 



N.T. Reactions of Phosphatic Fertilizers in Soils. To determine 



(Corasll) what factors control the concentration of phosphate in the soil 

 solution and to correlate the phosphorus uptake by plants with 

 the equilibrium concentration of phosphate in the soil solution. 

 Agron. UU-U 



N.T. Chemical Reactions of Ammonia in Soils. Study utilization 



(Cornell) of anmoniacal forms of N by plants as influenced by exchange 



adsorption & fixation of ammonia by soils with especial reference 

 to chemical reactions of anhydrous ammonia in soils. Attempt 

 to study simultaneously sorption rates & sorption equilibria of 

 ammonia gas in soils as a function of partial pressure of ammonia 

 & the soil moisture content using a modification of the constant 

 volume Warburg manometric apparatus. 

 Agron. 44-5 



N.C. Ionic Reactions in Clav and Soil Systems. To (l) investi- 



gate cation-exchange equilibria in various clay and soil systems 

 as to a. describing and predicting distribution of cations be- 

 tween solid and solution phases, and b. investigating theoreti- 

 cally and experimentally energies of ion exchange in clay and 

 soil systems; and (2) study membrane equilibria in clay and 

 soil systems, including measurements of a., ion distributions 

 across a membrane separating a soil or clay paste or suspension 

 from its equilibrium dialysate, b. membrane potentials, 2,. 

 single ion activities, 4» osmotic pressures and freezing points, 

 and e. conductivities. 

 Soils H-115 



