Kans» Availability of Plant Nutrients in Certain Kansas Soils, 

 To (l) determine potash status of Kansas soils, and factors 

 affecting K fixation and release; (2) study supply of iron, boron 

 and manganese and ascertain factors affecting the supply; (3) 

 determine amount of available phosphorus; (4) evaluate chemical 

 procedures for determining available forms of P, N and K and 

 lime requirements; and (5) make chemical analyses of soils and 

 plants that are desirable to interpret results from greenhouse 

 and field tests. 

 Agron, 269 



Mass# The Influence of Base Exchange Capacity and of Exchangeable 

 Ions in Soils on the Availability of Potassium and Other Cations. 

 To (1) obtain fundamental information on influence of base 

 exchange capacity of soils upon availability of various cations 

 to plants; (2) determine influence of complementary exchangeable 

 cations on availability of various other cations to plants; 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 persistajice of 

 one species over another •v^en grovm together. 

 Chem, 27 



Mo. Nutrition of Vegetable Crops. - a. Response of Vegetables 



to Established Cationlc Saturation Levels on Low Exchange Soils . 

 To continue investigation of comparative yield response of several 

 vegetables on Lintonia fine sandy loam the exchange complex of 

 which is differentially saturated with respect to cations Ca, 

 Mg, K and H; (2) determine extent to which soil amendments applied 

 last year have changed relative cationic saturation of exchange 

 complex on Lintonia fine sandy loam; and (3) establish more 

 definitely the relationship between exchangeable potash at con- 

 centrations over 300 lb. per A and response of certain vegetable 

 crops on calcium-laden river botton soils. 

 Hort. 196 



Mo. Energetics of Ionic Relationships in Soils and Plants . To 



(1) learn desirable and undesirable balsinces between major nutrient 

 cations of soil in terms of energy relationships between the cations; 



(2) leam energy levels at which NH, and Na in soil interfere with 

 the K, Ca, smd Mg nutrition of the plant; (3) leam extent that 

 energy level of H affects energy levels of Fe and Vn in soil; (4) 

 leam energy relationship between Fe and Ca, and Mn and Ca as they 

 affect the cationic nutrition of plant; (5) evaluate relative 

 amounts of cations needed in different kinds of soils to establish 

 desirable energy relationships; and (6) leam extent to which 

 nutritional balances of soil as expressed by energy relationships 

 are transmitted to the growing plant. 



Soils 263 Coop. USDA 



