We determined the effects of ethyl N,N-dipropylthiocarbamate (EPTC) in soil placed at different shoot zones of barley (Hordeum vulgare L.), wheat (Triticum aestivum L.), oats (Avena sativa L.), and sorghum (Sorghum vulgare Pers.) below the soil surface after emergence. A wax-barrier allowed separate exposure of the shoot zones to treated soil. Wheat, barley, and oats were severely injured when treated at the coleoptilar internode. Exposure of the remaining shoot did not affect growth. Sorghum was severely injured regardless of the shoot zone exposed. On this basis, sorghum was the most susceptible, while wheat, barley, and oats were equally tolerant. Uptake of 14C-EPTC from the soil by the sorghum shoots was double that of wheat, a fact which might explain the differential susceptibilities. These studies indicate that growth responses of species to EPTC applied to shoots is dependent on the stage of plant development at which treatment occurs.

The vapor pressures of the four most common commercial low-volatile esters and a reference high-volatile ester of 2,4-dichlorophenoxyacetic acid (2,4-D) were determined by gas-liquid chromatography. The order of increasing volatility and the vapor pressure of these esters in mm of Hg at 187 C are as follows: isooctyl—2.7; 2-ethylhexyl—3.0; butoxy ethanol—3.9; propylene glycol butyl ether—3.9; and the reference, isopropyl—16.7. Extrapolations to 25 C support this ranking at working temperatures. Commercial esters of 2,4-D derived from long-chain hydrocarbon alcohols are in the same volatility range as the commercial esters containing an ether linkage.

The fundamental unit of the metric system is the METER (the unit of length) from which the units of mass (GRAM) and capacity (LITER) are derived; all other units are the decimal subdivisions or multiples thereof. These three units are simply related, so that for all practical purposes the volume of one kilogram of water (one liter) is equal to one cubic decimeter.

Solutions containing 3-(m-trifluromethylphenyl)-l,l-di-methylurea (fluometuron) or 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron) were displaced through saturated 250-μ glass beads or through Norge loam soil at two water flow rates. The procedure used allowed uniform application of herbicide solutions to the soil surface and subsequent displacement of the herbicide through soil or glass bead columns at a constant water flow rate. Fluometuron was as mobile as the chloride ion at both high and low flow rates. The shape of the fluometuron distribution curves obtained at the two flow rates were distinctly different. The volume of water required to displace fluometuron through a material that adsorbed the herbicide was greater than that necessary to displace the fluometuron through materials giving a smaller amount of adsorption. More diuron was adsorbed by the glass bead system than fluometuron.

The meeting was called to order by President Richard Behrens at 4:35 p.m.

The next meeting of the Weed Science Society of America will be held at the Caesar's Palace Hotel, Las Vegas, Nevada, February 10–13, 1969, with only committee meetings February 10 and the program to begin February 11.

The following persons have agreed to serve as reporters of news items from their respective state, province, or area for use in this column of WEED SCIENCE. Members of WSSA, therefore, may send items for this column to their respective reporter, or directly to the editor as in the past.

The Weed Science Society of America operates a placement office as a service to its members. Listings of “Positions Available” and “Positions Desired” received the 12th of February, May, August and November by Orvin C. Burnside, Chairman, Manpower Placement Service of WSSA, Department of Agronomy, University of Nebraska, Lincoln, Nebraska 68503 are published in Weed Science. Once a listing is published it is discarded. If one wants a listing rerun it will have to be resubmitted. One man from each state and province and industry holding sustaining membership is asked to provide “Positions Available” and “Positions Desired” for his area once every three months. Individuals or companies may also send the necessary information directly to O. C. Burnside.

Information reported in Volumes 1 through 15 of WEEDS is presented in alphabetical order. Volumes 1, 2, and 3 were reviewed for appropriate entries; volumes 4 through 15 are represented by index entries listed in issue 4 of the respective volumes. Terminology currently in use has been used insofar as possible. The location of each subject as listed is indicated by the volume number before the hyphen and the specific page number thereafter.

The fundamental unit of the metric system is the METER (the unit of length) from which the units of mass (GRAM) and capacity (LITER) are derived; all other units are the decimal subdivisions or multiples thereof. These three units are simply related, so that for all practical purposes the volume of one kilogram of water (one liter) is equal to one cubic decimeter.