Some herbicidal properities of 2-chloro 2', 6'-diethyl - N - (methoxymethyl) acetanilide Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/db78tf852

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  • Studies were conducted to determine the site of 2-chloro 2', 6'-diethyl-N-(methoxymethyl) acetanilide (CP 50144) toxicity on barnyardgrass (Echinocloa crusgalli (L.) (Beauv.). This was done by means of a technique which used separate layers of treated soil to expose differentially the roots and/or the shoots of barnyardgrass seedlings. Coleoptiles that emerged through treated soil were completely killed. When only the roots were exposed to treated soil, the plants survived but a significant reduction in yield occurred. A study was conducted to investigate the possible differential susceptibility of corn strains to CP 50144. One double cross hybrid, the two single crosses and the four inbreds involved were tested at concentrations ranging from 0 to 16 ppm. Dry matter yields of shoots and roots were determined. No differential susceptibility was encountered at any of the rates tested. The persistence of CP 50144 in the soil was studied at four temperatures ranging from -12°C to +35°C. The study period was 151 days. Four rates of the product, ranging from 0 to 16 ppm., were tested. It was found that degradation was dependent on three factors which interacted significantly. Maximum detoxification occurred with maximum time of incubation, when temperature of storage was kept at +25°C and the rates of the chemical were minimal. A bioassay was used because no chemical analysis was available. The product was still so active after 151 days of storage that no growth could be detected at a concentration of 16 ppm. at any of the temperatures tested. The performance of the herbicide in the field was evaluated in an experiment involving corn growing in a field heavily seeded with barnyardgrass. No special benefit was derived from incorporation when compared with surface, pre-emergence application. No differences were detected either when CP 50144 was applied to a dry or pre-irrigated soil. Paramount control of the weed was obtained with two pounds of active ingredient per acre. No difference could be detected when this rate was compared with the four pound per acre rate.
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  • description.provenance : Submitted by Lauren Kaysen (lkscannerosu@gmail.com) on 2014-05-23T17:11:47Z No. of bitstreams: 1 GrandalOsvaldoT1967.pdf: 359117 bytes, checksum: d1d137620abef89b45556836a1b9df8a (MD5)
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