Ohio Factors Affecting Growth and Mineral Absorption by 

 Plants. 1» Relative Significance of Degree of Base 

 Saturation of the Colloidal Soil Complex and the Total 

 Quantity of Bases Present in the Soil in the Absorption 

 of Mineral by Plants « To evaluate the relative significance 

 of the quantity factor or total amount of the ion present, 

 and the intensity factor, or concentration of the ion on 

 the exchange complex, in the absorption of minerals by 

 plants, with particular reference to calcium, magnesium, 

 and potassium. 

 Agron. 1-1 



Ohio Factors Affecting Growth and Mineral Absorption by 



Plants. 2. The Influence of Hydrogen Ion Concentration in the 

 Absorption of Minerals by Field Crop Plants. To interpret 

 the effects of hydrogen ion concentration on plant growth when 

 other factors of the nutrient media are held constant. 

 Agron. 1-2 



Ohio Ionic Interactions in Soils and in Systems of Plant Roots 



in Relation to Nutrient Uptake, (l) Characterize clay & organic 

 fractions in representative Ohio soils; (2) study exchange pro- 

 perties of soils & separate constituents using clay membrane 

 electrodes to learn ionic interrelation in several cation 

 combinations; (3) learn exchange properties & ionic interrela- 

 tionships of plant roots, so comparison can be made with above; 

 and (4) correlate nutrient uptake as revealed by plant analysis 

 with ionic interrelation in roots & growth media. 

 Agron. 165 



Oreg. Chemical Pi*operties of Acid Soils in Western Oregon and 



Their Relation to Plant Growth and Nutrition. (l) Characterize 

 chemical properties of some of major soil series or other units 

 of classification of Western Oregon and colloidal constl+Aients 

 of these soils; and (2) relate chemical properties to their 

 influence on plant growth and nutrition. Includes study of 

 buffering, exchangeable H, and Al, and ion exchange. 

 Soils 254 



Texas Factors that Influence the Nutrient Availability of Soils. 

 To study (1) by chemical methods the factors which influence 

 capacity of typical Texas soils to supply nutrient elements, both 

 natural and applied, to plants grown in experiments in the green- 

 house or field; (2) by chemical methods the effect of various 

 soil factors on capacity of soil to change added fertilizer con- 

 stituents to chemically insoluble or biologically unavailable 

 soil compounds; (3) chemically, Texas soil profiles as to total 

 nutrients present, and availability of those present to plants; 

 (4) localized nutritional unbalances due to either a toxicity 

 or a deficiency of an essential nutrient for normal plant growth 

 and development; and (5) effect of varying nutrient supplies on 

 chemical qualities of plants. 

 Agron. 961 



