12 



Md, The Mineral Levels and Interrelationships of Mineral 



Nutrients in Fruit Plantings in Maryland ! To learn (1) 

 growth and fruiting response of apple trees to levels of K 

 in range above that of obvious deficiency; (2) effects of 

 mulching systems on mineral nutrition of apple and peach trees; 

 (3) causal factors of a physiological disorder in apple known 

 as "internal bark necrosis," and to effect controls for the 

 condition, 



Hort. Q-79-b 



Md, Influence of Nutrient Intensity and Balance on the 



Quality and Physiological Defoliation of Cantaloupes , To 

 determine (1) level of mineral concentrations needed in 

 substrate, and corresponding nutritional level necessary in 

 the plant for greatest amount of growth and yield, and for 

 highest quality, (2) effects of various methods and time of 

 applications of mineral nutrients to' obtain optimum concentra- 

 tions in the soil and/or in the plant as determined from 

 results in (1); and (3) influence of mineral levels in soil 

 and in plant on physiological defoliation, 

 Hort. Q-79-c 



Md# Influence of Nutrient Intensity and Balance Upon the 



Yield""and Quality of Tomatoes , To determine (1) levels of 

 mineral concentration needed in the plant, and corresponding 

 nutrient levels needed in substrate for highest yield and 

 quality; (2) influence of mineral levels in soil and in plant 

 upon physiological defoliation; and (3) in field trials, the 

 most effective methods and rates of application of mineral 

 nutrients at different stages of growth to obtain optimum 

 nutrient levels in plant as determined above, 

 Hort, Q-79-E 



Md, Mineral Nutrition of the Sweet Potato With Special 



Reference to Cation Inter-Relationships" ! To determine (1) 

 seasonal mineral nutrient uptake by sweet potato plant, and 

 correlation of mineral uptake with enlargement of fleshy 

 roots; (2) levels of mineral concentration in plant during 

 growing season, associated with high crop yields; (3) effects 

 of varying levels of cation nutrition and their interaction 

 upon growth and yield of the sweet potato plant; (U) in field 

 trials, the most effective methods, including timing and rate 

 of application of mineral nutrients, to obtain optimum nutrient 

 levels and yield response; and (f?) response of sweet potato 

 plant to minor element nutrition. 

 Hort. Q-79-F 



