31 



NB-12 Ijifluence of Environmental Factors on the Effective - 



ness of Herbicides* (l) To detemine the influence of 

 several climatic and soil factors on the effectiveness of 

 representative chemicals from among the major groups 

 of chemicals now used as selective herbicides; and (2) 

 to determine physiological, chemical and other changes 

 in plamts induced by the use of these herbicides. 



Cooperating stations: This section. Conn, (Storrs) 



II-C, N. J. II-C, N. T, (Cornell) H-C, .and W. Va. 



II-C, See part 24, Weed Control, for Del., Maine, 



Md., Mass., Pa., and R. I. projects. 



Note: This regional project is scheduled for termination 

 on June 30, 1958« The proposed title revision is Weed 

 Life Cycles, Soil Microorganisms, and Light as Factors 

 in the Control of Weeds in the Northeast. 



S-14 The Influence of Chemical. Physical and Mineralogical 



Properties of Soils on Their Structi|Xye and on Plant Growth. 

 (l) To devise means of separating the crystalline and 

 amorphous components of selected representative southern 

 soils; (2) identify and determine quanta tively the various 

 crystalline and amorphous components, including total 

 organic matter; (3) to characterize these constituents 

 through a determination of their chemical, physical and 

 mineralogical properties; (4) to cMipare the reactions 

 of these components in natural and in artificially prepared 

 mixtures; and (5) to relate these soil properties to soil 

 structure and to plant growth. 



Cooperating stations: This section. Ark. I-C, Fla. 

 I-C, Miss. I-C, Tenn. I-C and Texas I-C. Section b: 

 Ky. I-E: Section c: Ga. III-B, La. III-A, N.C. 111-B, 

 Okla. ni-B, P.R. I-E, Tex*s I-E and Va. III-B. 



S-22 Pesticides Residues - Determinations^ Sampling. Effects 



on Plants and Soils. To determine (1) standardization and 

 application of chemical and/or biological methods of pesticides 

 residue analysis; (2) standardization and application of 

 field sampling procedures used in pesticide residue analysis; 

 (3) evaluation of the effects of pesticide residues on 

 plant growth, plant products and soil; and (4) determination 

 of the pesticide residue load on agricultural coomodltles 

 of econoodc interest to the South. 



Cooperating stations: This section. Ark. II-C, 

 Ga. II-C, La. II-C, and Texas II-C. For non-soil 

 phases, see part 7, section 4* Insecticides. 



