Download or read book Degradation of Atrazine and Related Triazines in Hawaiian Soils written by Santiago Rigonan Obien and published by . This book was released on 1970 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book VIIIth Dutch British Endocrine Meeting written by and published by . This book was released on 1982 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atrazine Degradation in Soil written by David E. Armstrong and published by . This book was released on 1966 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Sorption and Degradation of Selected Triazine Herbicides During Transport in Soil water Systems written by Amy Patricia Gamerdinger and published by . This book was released on 1989 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Departmental Paper written by Hawaii Agricultural Experiment Station and published by . This book was released on with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Triazine Herbicides written by Janis Mc Farland Ph.D. and published by Elsevier. This book was released on 2011-08-19 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past 50 years, triazines have made a great impact on agriculture and world hunger by assisting in the development of new farming methods, providing greater farming and land use capabilities, and increasing crop yields. Triazines are registered in over 80 countries and save billions of dollars a year. The Triazine Herbicides is the one book that presents a comprehensive view of the total science and agriculture of these chemicals. With emphasis on how the chemicals are studied and developed, reviewed, and used at the agricultural level this book provides valuable insight into the benefits of triazine herbicides for sustainable agriculture. - Presents previously unpublished information on the discovery, development and marketing of herbicides - Includes a vital section on the origin, use, economics and fate of triazine herbicides - Covers benefits of triazines in corn and sorghum, sugarcane, citrus, fruit and nut crops - Establishes best management practice and environmental benefits of use in conservation tillage
Download or read book Health Aspects of Pesticides Abstract Bulletin written by and published by . This book was released on 1971 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of the Soils of the Tropics Vol 4 written by Arnold Clifford Orvedal and published by . This book was released on 1980 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Soils of the Tropics Tropics in general and islands of Pacific and Indian Ocean written by Arnold Clifford Orvedal and published by . This book was released on 1975 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Decomposition of 2 chloro 4 ethylamino 6 isopropylaminto S triazine atrazine and Related S triazine Herbicides by Soil Microorganisms written by William B. Duke and published by . This book was released on 1964 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrochimica written by and published by . This book was released on 1983 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microbial Degradation of Atrazine in Soils written by Horace D. Skipper and published by . This book was released on 1966 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atrazine is an asymmetrical s-triazine herbicide used pre- and post-emergence for the control of weeds in many crops. Under conditions considered unfavorable for microbial activity, atrazine may persist in soils for extended periods of time. However, the significance of chemical versus microbial degradation is not known. This study was conducted to determine the significance of microbial degradation of atrazine by pure cultures and the native soil population in non-sterile soils. Isolated bacterial cultures were used to inoculate seeds in an attempt to provide protection against atrazine residues. Atrazine-treated soil was incubated at 30°C for varying periods and the subsequent loss of activity was correlated to evolution of 14CO2 from labeled-atrazine in a radiorespirometric system. Microorganisms, mostly bacteria, were isolated from a soil solution; pour plates of atrazine-treated and non-treated soil; and the rhizosphere of corn, oats, tomatoes, and soybeans. Viable cell counts were used as an index to test for the utilization of atrazine as the sole source of carbon. Eight bacterial isolates did not show an appreciable difference in cell counts with or without atrazine as the sole source of carbon. Seed inoculation with a mixture of three bacterial isolates did not increase the growth of oats grown in atrazine-treated soil as an indication of crop protection. In synthetic media bacterial cultures evolved a small amount of 14CO2 from chain-labeled atrazine during the first 24 hours and none thereafter. In sterile soil the same isolates evolved 0.4-0.7 percent of the input activity in two weeks. A mold respired 4.0 percent. No ring breakage was observed. In non-sterile soils, 1.4-1.6 percent of chain and 0.6-1.0 percent of ring-labeled atrazine was evolved in two weeks and 1.1-1.6 percent of ring-labeled hydroxyatrazine. The latter rate was 2-3 fold greater than from ring -labeled atrazine and indicated the formation of hydroxyatrazine as the rate limiting step in the dissipation of atrazine from soils. Data from the incubation experiment showed a 73 percent loss of the initial atrazine after 3-4 weeks. In a similar time period, only 2.2-2.6 percent of chain and 1.0-1.2 percent of ring-labeled atrazine was respired. Thus, the 14CO2 data did not account for the loss of atrazine and further supports the formation of hydroxyatrazine as the rate limiting step. Extraction of the soils containing labeled-atrazine showed the presence of hydroxyatrazine in non-sterile and sterile soils after two weeks. The radiorespirometric system designed for these studies is proposed as a means to obtain a relative index of the residual life of herbicides or pesticides. The 14CO2 data may be extrapolated to give an index based on microbial participation. Extraction of the soils would provide a test for possible non-toxic metabolites that may be formed via chemical reactions. Such data would be most beneficial in selecting and recommending new herbicides.
Download or read book Annual Report of the Hawaii Agricultural Experiment Station written by Hawaii Agricultural Experiment Station and published by . This book was released on 1950 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Decomposition of 2 chloro 4 ethylamino 6 isopropylamino S triazine atrazine and Related S triazine Herbicides by Soil Microorganisms written by William B. Duke and published by . This book was released on 1964 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atrazine, atratone and ametryne are asymmetric s-triazine herbicides used pre- and post-emergence on many crops. Under conditions unfavorable for microbial activity, these compounds may persist in the soil for long periods of time. This study was conducted to determine the influence of the soil microflora upon atrazine, atratone and ametryne and to isolate microorganisms that were capable of utilizing these compounds as sole sources of energy. The relative rates of utilization of these compounds by isolated microorganisms were also studied. Woodburn silty clay loam soil was brought from the field and separate samples were treated with each of the herbicides. The samples were incubated for one and one-half months before use. Soil extracts were prepared from each of the incubated samples. Sterile Woodburn silty clay loam soil was treated with atrazine, atratone or ametryne and inoculated with a soil extract from the same incubated treatment. Carbon dioxide evolution was higher from those soil samples treated with the herbicides and inoculated with the soil extracts than from untreated soil inoculated with the same soil extracts. A soil perfusion apparatus was used to obtain microorganisms capable of utilizing atrazine and atratone as energy sources. Two microorganisms, identified as Penicillium sp. and Bacillus sp., were isolated on inorganic medium containing atrazine as a sole source of carbon. Carbon dioxide evolution from soil inoculated with Penicillium sp. and treated with atrazine, was significantly different from endogenous respiration. The addition of glucose increased the decomposition of atrazine by Penicillium sp. When atrazine was present as a substrate, oxygen uptake by Bacillus sp. increased significantly above endogenous respiration. Peptone and yeast extracts were shown to be more effectively utilized by these organisms. A Psetrdomonas sp. was isolated on inorganic medium containing atratone as a sole source of carbon. Oxygen uptake by this organism was shown to significantly increase when atratone was supplied as a substrate. However, it was shown that peptone and yeast extract were more effectively utilized by this organism. A yeast, Torulopsis sp., capable of growing on inorganic medium containing ametryne as a sole source of carbon, was isolated from Woodburn silty clay loam. Oxygen uptake by this organism was shown to significantly increase above endogenous respiration when ametryne was added as a substrate. Ametryne was more effectively utilized as a substrate than either peptone or yeast extract.
Download or read book Degradation of Bromacil Terbacil 2 4 D and Atrazine in Soil and Pure Culture and Their Effect on Microbial Activity written by Duane Carl Wolf and published by . This book was released on 1973 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings Soil Science Society of America written by Soil Science Society of America and published by . This book was released on 1975 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simultaneous Extraction of Hydroxyatrazine Atrazine and Ametryne from Some Hawaiian Soils written by Kishore Puri Goswami and published by . This book was released on 1973 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
