Fla. The Role of the Ma.lor Bases In Florida Soils > To determine 



interrelationships of K, Ca, Mg, and Na in Florida soils and their 

 relation to soil pH, exchange capacity and availability of minor 

 elements under various cultural practices and cropping systems. 

 Field plot tests, lab experiments and tests in commercial fields 

 will be designed to determine (l) rates of leaching of potassium 

 from soil and factors affecting its retention; (2) rates of 

 leaching of calcium and magnesiim from soils as related to pH, 

 base exchange capacity and form used — soluble salts or liming 

 materials; (3) investigation of new and Improvement of established 

 analytical methods including referee cooperation; (4) effect of 

 various base concentrations in soil on concentrations of bases 

 in plant tissue and growth of the plants; and (5) effect of bases 

 and pH on availability in the soil and the assimilation by the 

 plant of various nutrient elements. 

 Soils 598 



111. Ion TransTx>rt Mechanisms in Soils, (l) To study rate of 



diffusion as a function of moisture and other soil parameters and 

 diffusion of ions in absorbing and non-absorbing media; (2) study 

 mass transport of ions thru porous media as in flowing water; and 

 (3) apply above information to leaching of nutrients and feeding 

 of plant roots. 



Agron. 15-368 



Ind. The Effect of Oxygen Tensions and Plant Nutrients on Nutrient 

 Uptake Root DevelomentT (l) Study effects of ionic concentration 

 and ionic activity on nutrient uptake. To learn effects of; (2) 

 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; and (4) learn tension at which plants fail 

 to grow when grown at constant temperature and light in a standard 

 medium. 



Agron . 880 



Ind. The Mobilities of Ions in Clav Systems . Learn mobilities of 

 ions in clay systems. Make pastes of Wycaaing bentonite clay by 

 mixing powdered M-clay with solutions containing different concen- 

 trations of the Salt MX, where M represents the lithiim, sodium or 

 potassium cation and X represents the chloride, bromide or iodide 

 anion. Pack pastes into plastic cylinders and equilibrate in 

 solutions of same concentrations as those used in making the 

 pastes. Learn activities of MX in pastes by measuring the concen- 

 trations of the salt in the supernatant solutions. 

 Agron. 878 



Ind. An Ijivestigation of the Effects of Potassium and Phosphorus 



Deficiency on ^itrogen Metabolism in Plants. (l) Learn effect of K 

 deficiency on free amino acid distribution of plants; (2) effect of 

 K and P deficiency on free amino acid content and relative amount of 

 plant protein fractions; and (3) test for presence of the Krebs 

 urea cycle in higher plants with aid of CH labeled glutamic acid. 

 Biochem. 899 



