Download or read book Pesticide Spray Droplet Adhesion Modeling written by JA. Zabkiewicz and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spray droplet adhesion is a consequence of dynamic interactions of formulants within the spray droplet during flight and on impact, physical properties of the droplet (size and velocity), leaf surface morphology and leaf orientation. The objective of this study was to improve on a universal adhesion model incorporating the above factors. The previous spray droplet adhesion model has been extended to include droplet size (ranging from 180 ?m to 1000 ?m) and droplet velocity (0.63 ms-1 to 2.82 ms-1 at impact), and made more robust by increasing the number of formulations (dynamic surface tension of droplets at impact range from 20.7 to 72 mN m-1), the types of leaf surfaces (20% acetone contact angles on the leaf surfaces range from 61° to 124°), and the number of droplet impact angles (leaf angles from horizontal to 67.5°). In this study, contact angles using 20% acetone:water accounted for 95% of the differences between the leaf surfaces studied compared to 76% previously observed with water only. The present universal model explains 74% of the deviance. The current model's capabilities and limitations are discussed in relation to the physical parameters measured and observed.
Download or read book Pesticide Formulations and Application Systems written by Jane C. Mueninghoff and published by ASTM International. This book was released on 2001 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nozzle Formulation Interactions written by JK. Hacker and published by . This book was released on 2005 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests were conducted with a widely used herbicide (glyphosate) that is available in a range of formulations and a selection of commonly used nozzle types [XR TeeJet, extended range flat spray tip (XR), Turbo TeeJet, wide angle flat spray tip (TT), AI TeeJet, Air Induction spray tip (AI)] and determined the rebound characteristics of each combination using a difficult-to-wet foliar crop target (cabbage), an easy-to-wet hairy weed (velvetleaf), and a difficult-to-wet weed (lambsquarters). The rebound was determined under standard spraying conditions in a track room using a "bounce chamber" constructed at The Laboratory for Pest Control Application Technology (LPCAT). The amount of spray liquid retained and reflected from the leaf surfaces was determined by weight. The data showed that there were no significant differences between the nozzles, but that formulation differences did occur and were a reflection of surfactant level in the spray mixture. There was a significant formulation X leaf interaction and leaf X nozzle interaction, but not a formulation X nozzle interaction.
Download or read book Pesticide Spray Application Behavior and Assessment written by and published by . This book was released on 1976 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Novel Apparatus for Estimating Pesticide Volatility from Spray Droplets written by Jeffrey Poel and published by . This book was released on 1996 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Model for Estimating the Capture of Pesticide Spray Droplets by Plant Canopies Using Plant Areal Densities written by David F. Parkhurst and published by . This book was released on 1984 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eleventh Report National Spray Model and Application Technology Working Group Meeting written by Patricia J. Skyler and published by . This book was released on 2001 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pesticide Application Methods written by G. A. Matthews and published by Longman Publishing Group. This book was released on 1979 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The role of chemical control. Targets. Formulations. Droplets. Nozzles. Hand-operated hydraulic sprayers. Power-operated hydraulic sprayers. Air-carrier sprayers. Controlled droplet application. Fogging. Dust and granule application. Aerial application. Injection and fumigation techniques. Maintenance of equipment. Safety precautions. Selection of spraying equipment.
Download or read book Modeling the Spray Atomization of Emulsion Embedded Agricultural Solutions written by De-Wei Yin and published by . This book was released on 2010 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A typical agricultural chemical spray process involves atomizing a liquid stream of diluted pesticide solution through hydraulic spray nozzles that inherently produce a wide spectrum of spray droplet sizes. Finer droplets have higher potential for off-target movement or drift, which is of concern due to its potential impact on neighboring crops and livestock, sensitive ecological resources, and human health. Research by the Spray Drift Task Force and others has demonstrated that, although spray nozzle selection and application parameters are the key factors to produce the desired droplet size spectrum, the physical properties of the spray solution have significant effects on the droplet size distribution for various kinds of nozzles. One of these properties of many spray fluids is the inclusion of an oil phase in the form of an emulsion. The effect of oil-in-water emulsions on the spray droplet size distribution has been demonstrated by previous work. However, the mechanisms of this effect are largely unknown. In this study, a method to model this effect was proposed. A characteristic dimensionless number for connecting the bulk spray properties and the microscopic emulsion droplet properties was defined as the ratio between the emulsion recovery time and the spray atomization time. This study will help in the design of agricultural spray nozzles and the optimization of anti-drift spray additives.
Download or read book Modeling Pesticide Transport Under Field Conditions written by R. C. Zhang and published by . This book was released on 1995 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Virtual Nozzle for Modeling Pesticide Spray Deposition in a Plant Canopy written by Mehrdad Darvishvand Taher and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Virtual Nozzle for Modeling Pesticide Spray Deposition in a Plant Canopy written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerial Pesticide Spray Drift Models for Use in Regulatory Applications written by B. L. Taylor and published by . This book was released on 1984 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Predictive Modelling of Aerial Pesticide Spray Drift and Deposition Phase I written by SENES Consultants Limited and published by . This book was released on 1984 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Simulation for the Dynamics of Evaporating Spray Droplets in Agricultural Spraying written by Robert Elmore Williamson and published by . This book was released on 1972 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transport Model of Spray Droplets Above and Within a Plant Canopy written by J. Rhee and published by . This book was released on 1990 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sticking with Droplets written by Matthew Butler and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
