-lo- 

 ll. C. Weed Control ia Corn, Sorghum, Tobacco, Samll Grain , 

 lortietLltiiral Crops, emd the Spec If le Control of Beraada 

 Grtiss and Wild Garlic , To develop (1) field production 

 practices to better control veeds in com, sorghim, tobacco, 

 small grain, and horticultural crops, and better control 

 methods for Bermuda grass and vild garlic; euad, (2) basic 

 principles and practices involved in satisfactory farm tise 

 of above methods, to learn facts needed to xinderstand fail- 

 ures if and when they occur, and methods of preventing such 

 failures . 



Field Crops H-59 



Ohio Causes of iflbsclsslon of Flowers and Yo\ang Fruits Follow- 

 ing Applications of Synthetic Hormones and the Relation of 

 Waturally occurring Hormones to Such Abscisslola l To (1) 

 determine causes of abscission of flowers emd fruits resulting 

 from application of synthetic hormones applied diarlng bloom 

 and subsequent fruit setting period; (2) meastire variation in 

 naturally occurring hormone content of developing and absciss - 

 ing young fruits of several apple varieties to relate if possible 

 such differences as may be fo\md to particular fruit setting 

 behavior of the variety; (3) measure effect of applications of 

 synthetic hormones on natural hormone content of developing 

 fruits; and, (k) study Afftet of applications of synthetic 

 hormones on anatomical «ad oytologlcal behavior of developing 

 ovules, enbryo sacs, eid>ryo and endosperm* 

 Hort. h 



Ohio Nitrogen and Mineral Nutrition of Tree Fruits . To (l) learn 

 influence of differential nitrogen fertilization on the absorp- 

 tion and accumsiulatlon of mineral elements and on the growth, 

 yield, and fruit quality of mature bearing apple trees; (2) 

 learn influence of different rates and combinations of N, P, 

 and K fertilizers on the growth, chemical composition, and 

 productivity of newly established apple orchards; (3) leeum 

 effect of soil and spray applications of K and Mg on growth, 

 chemical composition, and productivity of a yotuag orchard 

 established on site previously shown to produce foliage con- 

 taining less them established critical levels for these elements; 

 and, (k) attearpt to further refine nutritional needs of tree 

 fruits with respect to macro- and micro -nutrient elements by 

 meeuis of foliar analysis and correlation with growth, yield, 

 and quality of the fresh product. 

 Hort. 69 



