10 



Hawaii 



Hawaii 



Idaho 



Ind. 



Ind. 



La. 



Investigations of the Nutritional Requirements of Crop 

 Plants in Hawaii to Provide Information "Which Will Serve as 

 a Guide to Scientific Fertilization. To accumulate informa- 

 tion by means of physiological investigation on the nutrition 

 of crop plants in Hawaii. This knowledge is to be used as a 

 guide in future recommendations for fertilizer treatments to 

 maintain optimum yield and quality of crops. 



PI. Physiol. 659 



Nutritional Requirements of Coffee Growing on Lava 

 Rockland Soil . Learn: (1) phosphate requirements of coffee 

 grown in rockland areas; (2) if there are any minor element 

 requirements for high yields in rockland areas; (3) importance 

 of frequency of fertilizer applications, timing, and kind of 

 carriers in promoting high yield in rockland areas. 



PI. Physiol. 6S9.1 



Nutrition of Fruit Trees in Idaho . Learn nutritional 

 needs and work out effective and efficient means of supply- 

 ing major and minor nutrients. Develop improved techniques 

 for diagnosing nutritional deficiencies. 



PI. Physiol., Hort. 269 



A Study of Root Absorption of Fertilizers by Plants. To 

 learn relationships that exist between nutrient uptake from 

 localized applications of fertilizers and the plant's 

 environment. 



Agron., Hort. 797 



The Effect of Oxygen Tensions and Plant Nutrients on 

 Nutrient Uptake Root Development . (1) Study effects of ionic 

 concentration and ionic activity on nutrient uptake. To learn 

 effects of: (1) tension on rate and amount of uptake of 

 other ions from a mono-salt solution and suspension; (3) 

 amount of surface area or exchange capacity of collodial 

 material in root medium on uptake of ions at various tensions. 

 (U) Learn tension at which plants fail to grow when grown at 

 constant temperature and light in a standard medium. 



Agron. 886 



Minor Elements in Soils . Evaluate minor elements content 

 of major soil types by chemical and biological methods. Learn 

 crop responses to minor element fertilization of soils and 

 relationship and balance required between a given minor element 

 and any of other nutritive elements or combination of elements. 

 Evaluate merits of various minor element carriers on soils of 

 varying physical and chemical properties. Study effects of 

 varying levels of available minor elements on growth and quality 

 of crops as interpreted by chemical and biological assays. 

 Study chemical behavior of minor elements, as affected by type 

 of clay minerals, per cent saturation, and complementary ions. 



Agron., PI. Physiol. 878 



