18 



N. D. Nitrate Production in the Soil and its Effect on 

 Potato Scab . Learn (l) effect of various amounts and 

 forms of inorganic soil N on development of Potato Scab; 

 and (2) conditions influencing accumulation of a hi/?h 

 amount of ammonia nitrogen in soils. 

 Hort., Agron., Bact. 8-1 



Okla. The Influence of Moisture and Organic Matter on the 

 Reduction of Nitrates in Soil . Learn (l) influence of 

 different kinds and amounts of organic matter on reduc- 

 tion of nitrates in soils; (2) influence of soil moisture 

 on nitrate reduction; and (3) interaction of above variables 

 on nitrate reduction. Organic materials are wheat straw, 

 sorghum and alfalfa. 

 Soils 954 (S-35' 



Oreg. Soil Microorganisms Influencing Nitrogen Availability . 

 Nitroger ) Rftl^nf^ e^ ^nd Losses in Semi-Arid Soils. Study of 

 nitrogen losses and nitroeren balance as influenced bv nitro- 

 gen fertilizers and organic matter additions in semi-arid soils. 

 Bact. 177 (W-31) 



Pa. A More Efficient Rhizobium for Inoculating Birdsfoot Trefoil 



( Lotus Comiculatus) . Improve methods for maintaining inoculum 

 titer in soil; (2) study interactions in soil between rhizobia 

 and other members of soil microflora; (3) obtain strains of 

 rhizobia that will more rapidly cause effective nodulation; 

 and (/j.) study physiology of symbiotic nitrogen fixation in 

 Lotus comiculatus. Collect from plant isolations and from 

 conmercial inoculant producers a wide variety of strains 

 of rhizobia represented to be effective for nodulating Lotup . 

 Produce antisera for strain identification by rapid immuni- 

 zation of rabbits using selected rhizobia strains as antigens. 

 Inoculate Lotus seed with strains of rhizobia using various 

 proteins, lipid, or carbohydrate mixtures to fasten inoculum 

 to seed and to maintain the rhizobia in an active state, 

 Bact. 1336 



Texas Biochemistry of Nitrogen Fixation and Utilization. To 

 obtain further information on specific chemical reactions 

 which take place during fixation of atmospheric N and to 

 reinvestigate role of the plant and role of the bacterium 

 in symbiotic N fixation. 



Biochesu^ Nutr^ $30 



For more information on research in this category, see 

 Section b, I, B. Nitrogen 



