Download or read book Response of Wheat Triticum Aestivum L Cultivars and Downy Brome Bromus Tectorum L to Metribuzin and Ethyl Metribuzin written by Muhammad Munir and published by . This book was released on 1988 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Downy brome (Bromus tectorum. L.), a serious grass weed in eastern Oregon can be partially controlled in wheat by metribuzin [4-amino-6-tertbutyl- 3-(methylthio)-as triazin -5(4H)-one]. However, cultivars of many crops Lave been reported to differ in their level of tolerance to metribuzin. This lack of tolerance has led to the investigation of other compounds, such as the ethylthio analog of metribuzin [4-amino-6-tert-butyI-3-(ethylthio)-as-triazin- 5(4H)-on], for selective control of downy brome in wheat. Greenhouse and growth chamber experiments on wheat, growing in soil or nutrient solution showed that: 1) GR50 values for Stephens, Hill 81, Yanahill, and Malcolm in soil were 0.41, 0.23, 0.25, and 0.44 kg/ha, respectively, for metribuzin and 1.89, 1.29, 1.37, and 1.97 kg/ha, respectively, for ethyl metribuzin; 2) GR50 values for these cultivars in nutrient solution were 3.26, 1.17, 1.32, and 3.87 uM, respectively, for metribuzin and 12.69, 7.20, 7.19, and 13.41 uM, respectively, for ethyl metribuzin; 3) Uptake of both herbicides.; by wheat was through the roots; 4) Cultivars did not show any differences in herbicide absorption from the nutrient solution. Therefore, differences in varietal tolerance may be are due to biochemical or physiological reasons, but are not due to differences in herbicide uptake. Increased growth at lower concentrations of these herbicides was observed in all cultivars studied. Metribuzin was five times more active than ethyl metribuzin. Both of these herbicides can be applied as an early postemergence treatment at the 3 leaf stage of wheat for effective control of downy brome. Yield components of the four cultivars were measured in response to metribuzin and ethyl metribuzin at two ecologically different sites. The susceptible cultivars (Hill 81 and Yamhill) showed greater injury in the lighter soils with high pH and lower organic matter content. Visual estimates of crop injury were generally higher than the actual reduction in final yield. Crop injury ratings up to 25% generally did not show a significant reduction in final grain yield. A positive correlation between protein content and concentration of these herbicides was noted. A study on the joint action of these two herbicides in the field and greenhouse showed that the combination of the two, increased the control of downy brome at lower rates. Their combined action was studied by using Colby's method and isobole method of Tammes. The reaction was calculated as additive. Downy brome was 8, 5, 5, and 9 times more sensitive to metribuzin and 6, 4, 4, and 6, times more sensitive to ethyl metribuzin than were the cultivars Stephens, Hill 81, Yamhill, and Malcolm, respectively. The use of these two herbicides to control downy brome in the cultivars Hill 81 and Yamhill should be avoided unless careful attention is given to soil properties and environmental conditions.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1989 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Australian Journal of Agricultural Research written by and published by . This book was released on 2007 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1990 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Response of Wheat Triticum Aestivum L Varieties to Metribuzin Based Herbicide Mixtures With CD Copy written by Sarita Rani and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index to American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Weed Science written by and published by . This book was released on 1987 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Agrindex written by and published by . This book was released on 1993 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Weed Technology written by and published by . This book was released on 2006 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990 with total page 1254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Variation and Competition of Downy Brome Bromus Tectorum in Winter Wheat Triticum Aestivum written by Phillip W. Stahlman and published by . This book was released on 1989 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Western Society of Weed Science written by Western Society of Weed Science (U.S.) and published by . This book was released on 1983 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Glyphosate Sethoxydim and Ethyl Metribuzin for the Selective Control of Downy Brome in Irrigated Kentucky Bluegrass Seed Production Fields written by Steve R. Poitras and published by . This book was released on 1989 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990-11 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 1993 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Temperature on the Activity of Metribuzin and Its Ethylthio Analog in Thylakoids Protoplasts and Plants of Downy Brome Jointed Goatgrass and Winter Wheat written by Robert Alan Buman and published by . This book was released on 1990 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Influencing Metribuzin Use in Strip planted Wheat written by Ali Zeghida and published by . This book was released on 1982 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equipment for strip-till planting is under development in wheat-fallow rotations in the Columbia Basin of Oregon. This involves the absence of tillage during the fallow season. At planting time, the strip-till planter creates a narrow band into which the wheat seed is placed. The area between the rows is undisturbed except for the deposition of a 2-cm thick layer of soil displaced from the tilled area. Chemical weed control is required between the rows. Preliminary work has shown that metribuzin [4-amino-6-tert-butyl-3- (methylthio)-as-triazin-5(4H)-one] is a promising herbicide for this purpose. Factors influencing the application, effectiveness, and selectivity of metribuzin used in conjunction with strip-till planting were investigated in the laboratory and greenhouse. Application of metribuzin in combination with liquid fertilizer would be convenient and economical. Laboratory experiments were conducted to determine the physical compatibility of four liquid fertilizers: Solution 32 at 56 kg N/ha, 10-34-0 at 45 kg P205/ha, 0-0-15 at 22 kg K/ha, and 11-0-0-26 at 22 kg S/ha, with three metribuzin formulations each of Sencor and Lexone at 112 g a.i./ha. Wettable powder, flowable, and dispersible granule formulations of both Sencor and Lexone were tested. Only the wettable powder formulations were sufficiently compatible with the liquid fertilizers tested to be recommended for practical commercial use. Large differences were seen between the other formulations. Their use with liquid fertilizers might require the addition of compatibility agents or mixing them with water first, before adding them to the fertilizers. When compatibility is obtained after mixing them with water first, continuous agitation might be required to maintain the suspension. No major differences were observed between comparable formula tions of Sencor and Lexone. Greenhouse experiments were conducted to determine the biological compatibility of Solution 32 and metribuzin on downy brome (Bromus teetorum LJ, the effect of Solution 32 on downy brome and wheat emergence, the effect of soil layer on metribuzin effectiveness for downy brome control, and the effect of banding width over the wheat row and wheat seeding depth on metribuzin phytotoxicity to wheat. More effective downy brome control was obtained when metribuzin was mixed with Solution 32 than when it was used alone. Solution 32 was used at 0, 36, 54, and 79 kg N/ha, and metribuzin at 0, 14, 28, 56, and 112 g a.i./ha. Solution 32 itself had some phytotoxic effects on downy brome at the high rates. Wheat was not affected as severely as downy brome. Application of metribuzin to the surface of the newly deposited soil layer was more effective in controlling downy brome than when the herbicide was applied and then covered with the soil layer. Results suggested that better downy brome control could be obtained with metribuzin applied after the strip-tiller had deposited the soil layer between the rows, especially if adequate rainfall is expected. Under such rainfall conditions, metribuzin covered with a soil layer may leach deeper out of the root zone and less effectiveness could result. Both seeding depth of wheat and width of the unsprayed area were factors influencing metribuzin phytotoxicity to wheat. Greater wheat injury was observed when the herbicide was applied on top of, or too close to, the seed row, particularly when wheat was planted shallow. The results suggested that wheat should be planted 3 cm deep or deeper when the unsprayed band is 15 cm wide, and at least 5 cm deep when the unsprayed band is 10 cm wide.