13 



Md. Influence of Nutrient Intensity and Balance on Growth , 



Yield, and Quality of Cauliflower , To learn (1) mineral 

 nutrient levels in substrate and in plant for optimum growth 

 and head production of cauliflower, (2) influence of nutrient 

 levels in substrate and in plant on buttoning, (3) effects of 

 various methods and times of application of different ferti- 

 lizers as related to nutrient content of plant and to plant 

 growth and head production. 



Hort., PI. Physiol. Q-79-H 



Mass. The Formation and Source of Nitrites in Nutrient Solu- 



tions ♦■ To learn what combinations of nutrient chemicals 

 facilitate the formation of nitrites in nutrient solutions. 

 Bot. 22' 



Mass. The Influence of Base Exchange Capacity and of Exchange- 



able ions in Soils on the Availability of Potassium and Other 

 Cations 7 To (1) obtain fundamental information on influence 

 of base exchange capacity of soils upon availability of var- 

 ious cations to plants; (2) determine influence of complemen- 

 tary exchangeable cations on availability of various other 

 cations to plants j and (3) determine effect of cation exchange 

 capacity of the plant roots of different plants upon uptake of 

 various cations by the plants and find if this property of 

 plant roots may determine "feeding power" of various plants 

 and account for persistence of one species over another when 

 grown together. 

 Chem. 27 



Mass. Boron as Related to Soil Fertility and Crop Production . 



To (1) study plant and soil factors influencing B needs of 

 different plants, (2) evaluate the use of plant factors and 

 soil tests in learning fertilizer B practices for different 

 plants . 



Chem. 28 



Mass. Effect of Nutrient Elements, Light and Temperature on 



Growth of Carnations . To study (1) B requirements of carna- 

 tions and identify deficiency symptoms, (2) interaction of Ca 

 and B in nutrition of carnations and establish a satisfactory 

 B-Ca ratio for carnation production, (3) interaction of K and 

 Mg in nutrition of carnations, and effect of high levels of K 

 in inducing Mg deficiency in carnations, (H) effect of P levels 

 on carnation production in soils prepared with relatively large 

 quantities of peat moss, (5>) effect of supplementary light on 

 growth and production of carnations, (6) relationship of light 

 duration and night temperatures for carnation production. 

 Hort. 61 



