24 



Pa, Microbiological Studies. - Waed Control. To (l) 



determine effect of organic herbicides on activity of 

 soil microorganisms, and (2) study microbiology of 

 decomposition of organic herbicides in soil. 

 Bact. 1095-G 



Texas Effects of Insecticides on Plants and Soils. To 



determine the effects of benzene hexachloride, DDT, toxaphene 

 and dieldrin on cotton and other crops. 

 Ent. %6 (S-22) Coop. ARS 



W. Va. Factors Affecting the Herbicidal Activity of Some 



Chemicals Applied to the Soil Surface. To study (1^ fun- 

 damental relations between soil characteristics on the 

 effectiveness of various herbicides as measured by germina- 

 tion and seedling vigor in the greenhouse; (2) effective 

 rate of application of herbicide under controlled conditions 

 of moisture and pH; (3) influence of above soil characteris- 

 tics as they affect herbicidal activity of 2,4-D, dinitro's 

 etc.; and (4) persistence of herbicidal activity under 

 controlled soil moisture conditions. 

 Agron., Genet. 76 (NE-12) 



Wis. Fundamental Problems Associated with the Accimulation 



of Pesticidal Chemicals in Soils. To determine magnitude of 

 insecticidal accumulations in Midwestern soils, rate and 

 reasons for disappearance of typical insecticides from 

 various soil types and effect of soil-borne insecticides 

 on soil flora and non-insect fauna. 

 Ent. 897 (NC-19) 



D. Other Soil Microbial Activities 



Ariz. The Nature of Microflora and Their Activity in Arizona 

 Soils as Affected bv Soil Temperature. Moisture. Salinity, 

 rfl. and Other Factors Peculiar to Semiarid Conditions. To 

 (1) study the influence of teatperature and moisture varia- 

 tions peculiar to irrigation practice, salinity, and pH on 

 activity and fimction of soil microflora; (2) the prevalence 

 and distribution of free-living nitrogen-fixing algae In 

 native desert and irrigated soils with regard to moisture, 

 temperature, salinity, and organic residues; and (3) the 

 distribution and nature of bacteria, fungi, actiomycetes 

 and algae in high salt soils by CO2 - evolution (respira- 

 tion) method. 



Chem. Soils 283 



