Fourteen herbicide treatments were evaluated for the control of littleseed canarygras in durum wheat. Hoelon produced marginal (65%) control, Achieve fair (77%), Control and Puma good (92%) control. Tank mixes of Achieve and Puma with MCPA and Aim resulted in reduced canarygrass control. New ALS inhibitors, Olympus and F130060, produced good to excellent (85 to 95%) control except when mixed with crop oil concentrate and liquid nitrogen.

Selective application of herbicide in agricultural cropping systems provides both economic and environmental benefits. Implementation of this technology requires knowledge of the location and density of weed species within a crop. In this study, two image classification techniques (Artificial Neural Networks (ANNs) and Maximum Likelihood Classification (MLC)) are compared for accuracy in weed/crop species discrimination. In the summer of 2005, high spatial resolution (1.25mm) ground-based hyperspectral image data were acquired over field plots of three crop species seeded with two weed species. Image data were segmented using a threshold technique to identify vegetation for classification. The ANNs consistently outperformed MLC in single-date and multitemporal classification accuracy. With advancements in imaging technology and computer processing speed, these network models would constitute an option for real-time detection and mapping of weeds for the implementation of site-specific herbicide management. / xii, 106 leaves : ill. (col. ill.) ; 29 cm

The degree work describes the biology and morphology of the weed plants, which are found in maize vegetation most frequently, as well as their spreading and possible regulation. Based on the findings acquired, the methods of chemical and mechanical regulation are described. The degree work describes briefly both the plant of maize itself and the process of its growing. The attempt took place on the school farm of the Agricultural School in Tábor; a small plot attempt was carried out at the same place. The frequency of the occurrence of weed species on the selected small plots was evaluated in the hybrids of maize (Zea mays). The degree work contains data on the extent of the occurrence of weeds on individual plots, on which the individual hybrids of maize were compared with one another. It also includes an economic evaluation and possible measures to eliminate the spreading of weeds.

Please read the abstract on p1 of the document 00dissertation / Dissertation (M Inst Agrar (Sustainable Insect Management))--University of Pretoria, 2007. / Zoology and Entomology / M Inst Agrar / unrestricted

Cranberry (Vaccinium macrocarpon Ait.) is a woody perennial crop that can remain productive for decades. Competition for resources between cranberries and weeds can depress cranberry farm yields, resulting in large annual crop losses. Renewed interest in reducing chemical inputs into cranberry systems has provided the motivation to evaluate methods, such as flame cultivation (FC), as potential nonchemical options for weed control. Also known as thermal weeding, FC exposes plants to brief periods of high temperature that causes the water in the plant tissue to expand rapidly, rupturing plant cells and leading to necrosis. Various FC methods have been used successfully in annual crops as both a preemergence and postemergence weed control, but few scientific reports have been published on the use of FC on perennial weeds in a woody perennial crop system. Dewberry (Rubus spp.), sawbrier (Smilax glauca), and common rush (Juncus effusus) are cranberry weeds that are difficult to control, spread quickly and can cause significant crop loss. Flame cultivation may be an effective non-chemical means for controlling these weeds in cranberry systems. FC would ideally be used as a spot treatment for weeds growing in the cranberry canopy, as well as on larger non-production areas where cranberry vines are not as abundant, such as bog edges, ditches, and dikes. Using FC to treat weeds within the cranberry canopy will likely cause localized damage to cranberry plants immediately surrounding the weeds, thus cranberry response to FC is also of interest. The following experiments were designed to examine the response of weeds and cranberry plants to FC. Perennial plants rely on reserves of nonstructural carbohydrates (NSC) for growth and survival, thus the efficacy of FC treatments to weeds will likely be impacted by the timing and frequency of treatments as they relate to the specific carbohydrate cycles of targeted weeds, such as dewberry. An additional experiment studied the seasonal fluctuations of NSC in dewberry roots. Cranberry growers were also surveyed on their past experiences with FC, as well as their willingness to adopt FC if proven an effective method for controlling weeds.

Call number: LD2668 .T4 1962 G36

Le présent mémoire de recherche-création se divise en deux parties. La partie « création » contient trois épisodes extraits d’une série télévisée originale s’intitulant Chroni[c]ques, laquelle raconte l’histoire de Tommy, un jeune revendeur de drogue bien intentionné. La seconde partie, réflexive, porte sur l’art de la scénarisation tel que présenté dans quatre guides sur l’écriture sérielle, le but étant de déterminer si les prescriptions qu’on y trouve en vue de la rédaction d’un scénario s’avèrent favorables à la créativité ou si, au contraire, elles tendent plutôt à en restreindre le déploiement. Pour ce faire, quatre ouvrages sont explorés : The TV Writer’s Workbook d’Ellen Sandler, Writing The TV Drama Series de Pamela Douglas, Inside The Room de Linda Venis et The TV Showrunner’s Roadmap de Neil Landau. Ainsi, le premier chapitre de la partie essai présente les prescriptions offertes par les guides à l’étude, et ce, en fonction de cinq axes propres à la scénarisation pour la télévision : le format, l’intrigue, les personnages, les dialogues et la médiation qui s’opèrent entre un scénario brut et ses conditions de réalisation finales. Le deuxième chapitre de cette partie consiste en une analyse de cas : celle d’une série télévisée qui semble de prime abord contrevenir aux prescriptions relevées précédemment, soit Weeds, création de Jenji Kohan diffusée sur les ondes de Showtime aux États-Unis. Il s’agit ici de vérifier dans quelle mesure cette série répond ou non aux prescriptions des guides décortiqués plus tôt. Finalement, au troisième chapitre, un bref retour est effectué sur les défis rencontrés au cours de l’écriture de Chroni[c]ques, principalement en ce qui concerne le respect, ou non, des prescriptions relevées et analysées au préalable.

Much of the literature on herbicide resistant weeds suggests that farmers do not adopt resistance management practices on rented land to the same extent as on owned land. This study uses data from the USDA Agricultural Resource Management Survey for corn and soybeans to compare adoption of resistance management practices on owned and rented land analyzing national and regional data for a variety of weed management practices. There was little support for the hypothesis that renters adopted resistance management practices less than owners. In most cases, there was no significant difference in adoption rates. In cases where there were statistically significant differences, it was more common that resistance management practice adoption was higher on rented land than on owned land. The second part of this study estimated a hazard model to predict when resistance to glyphosate would first be detected in corn fields in a state. The model was used to test hypotheses about whether adoption of different weed management practices delayed or sped up the onset of resistance. The analysis found evidence that greater use of phosphinic acid herbicides (the herbicide family that includes glyphosate) sped up the onset of glyphosate resistant weeds.

5 pp. / Precision herbicide application is an effective tool for placing soil incorporated herbicides which have a tendency for soil adherence. And while field implementation depends on previous knowledge of soil textural variability (soil test and texture evaluations), site-specific technologies show promise for Arizona vegetable producers in non-uniform soils. Regardless of the method used for textural characterization, growers should keep in mind that textural differences do not change in the short/medium term, so the costs associated with defining texture-based management zones can be spread over many years.

This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.