Abstract. Roots and shoots of corn seedlings (Zea inays L. var. Dixie 18) germinated in trifluralin (a,a,a-trifluoro-2,6-dinitro-N,N-dipropvl-p-toluidine) Certain growth regulating chemicals such as 'Tordon (4-amino-3,5,6-trichlo.ropi'colinic acid) and 2,4-D prommote radlial enlargement of iplant segments and also affect nucleic acid metabolism (11,12,17). The carbamates also promote radial enlargement of root tissue and are believed to disrupt spindle formiation in cell division (7). Standifer et al. (28) and Talbert (29) found 'that swelling of the root terminalts was the iobvious morphological effect caused by the herbicide trifluralin (a, a, a-trifluoro-2, 6-dini.tro-N, N-dipropyl-p-tolluidine). Talber't (29)

No abstract

Summary. The adsorption of diquat cation was found to be 0.3, 2.0–2.5 and 80–100 mg/g on a sandy loam soil, Grade Hydrite 10 Georgia kaolinite and National Standard Bentonite, respectively. Bentonite (113 lb/surface ac) applied to plastic pools previously treated with 1 ppm paraquat reduced the concentration of paraquat to less than 0–05 ppm within 24 hr of application. Only bentonite appeared to hold either diquat or paraquat in a form unavailable to wheat. Appreciable uptake by wheat from soil treated with diquat or paraquat (16 lb/ac pre‐emergence) occurred only in soil or sand in which the herbicide leached below the 05 in. zone. A 12 hr dark period following foliage application did not appear to enhance movement of either herbicide in wheat. Loss of radioactivity was observed when diquat or paraquat was exposed to ultraviolet light (2537 Å). Facteurs agissant sur la persistence et l'inactivation du diquat et du paraquat

Warburg experiments indicated that fluometuron-[3-(m-trifluoromethylphenyl)-1,1 -dimethylurea], at rates up to 10 p.p.m., did not affect respiration of cotton or cucumber. Both Warburg and 14C02 fixation studies indicated that fluometuron inhibited photosynthesis by these species. A subsequent

Degradation of 1,1-dimethyl-3-(a,a,a-trifluoro-m-tolyl) urea (fluometuron) in a sandy loam soil was investigated in time-course and 14CO2 evolution studies. Degradation occurred only in nonautoclaved samples and was more rapid in glucose-amended soil, indicating that it is a function of microbial metabolism. Time-course studies showed that the pathway of degradation of fluometuron in soil is similar to that previously reported for other substituted ureas, involving a two-step demethylation, probably followed by hydrolysis of the urea linkage to form the aniline derivative. Further evidence for degradation was a small but significant recovery of 14CO2 from soil treated with fluometuron labeled in the trifluoromethyl group.