16 



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 Use of Foliar Applied Manganese in Correcting Manganese 



Deficiency in Agronomic Crops . To learn (1) rate and solution- 

 volume of foliar applied Mn required to obtain adequate correction 

 of Mn deficiency, (2) stage of plant development most responsive 

 to correction of Mn deficiency by foliar application, (3) 

 efficiency of absorption of foliar applied Mn, (U) effect of 

 environment and solution characteristics on absorption of foliar 

 applied Mn. 



Agron. 1-5 



Ohio Effect of Magnesium and of Trace Element Applications Upon 



Yield, Quality and Foliar Composition of Onions and Celery 

 Grown on Muck . Learn (1) precise effect of applications of Mg 

 and certain trace elements on growth and yield of onions and 

 celeryj (2) their effects on quality as measured by certain 

 physical -and chemical tests; (3) effect of applications on leaf 

 composition with respect to major and trace nutrient elements. 

 (U) Correlate yield and quality with such chemical composition. 

 Hort. 181 



Okla. A Study of Chlorosis of Certain Woody Ornamentals in 



Oklahoma. To find the most satisfactory combination of chem- 

 icals and concentrations, and methods of application to correct 

 the conditions causing chlorotic foliage of Pin Oaks, Thunberg 

 spireas, and other affected plants under Oklahoma climatic and 

 soil conditions. To determine if a practical correction of 

 chlorosis of the plants being tested can be obtained by lower- 

 ing the pH of the soil. 

 Hort. 866 



Pa. The Use of Surveys to Determine "Optimum Values" of 



Nutrient-Element Leaf Concentrations." To determine lea? con- 

 centrations of various essential elements in major horticultural 

 crops which are associated with desired responses as affected 

 by fertilization, soil, and climatic conditions. 

 Hort. 87U-A 



Pa. Nutrient-Element Deficiencies in Horticultural Crops. 



To study (1) use of leaf analyses in confirming visual diag- 

 nosis; and (2) value of various nutrient-containing materials 

 in correcting these symptoms when applied to soil or as 

 foliage sprays. 

 Hort. 87U-B 



