• Cómo Convertir de Galones a Pulgadas, y Determinar el Tiempo de Operación Para los Sistemas de Riego por Goteo en Cultivos en Surcos

      Martin, Edward C.; Barreto, Armando (College of Agriculture, University of Arizona (Tucson, AZ), 2017-02)
      La conversión de sistemas de riego por gravedad a sistemas por goteo requiere más que la inversión de capital. Los agricultores y regadores deben adaptar sus estrategias de manejo para dar acomodo al nuevo sistema de riego. En particular, los sistemas por goteo no están diseñados para aplicar las grandes candidades de agua de riego que la mayoría de los sistemas por gravedad sí son capaces de aplicar. Dependiendo del diseño y distribución del sistema por goteo, este sistema puede tomar varias horas para aplicar una pulgada de agua a la parcela, mientras que la mayoría de los sistemas por gravedad pueden aplicar de 4 a 8 pulgadas en 12 horas. Debido a esta diferencia, los agricultores que utilizan sistemas por goteo necesitan monitorear muy de cerca la condición de humedad del suelo de sus campos regados por goteo y regar apropiadamente. Reviewed 01/2017; Originally Published 05/2011.
    • Cómo Determinar la Cantidad de Agua de Riego Aplicada a una Parcela

      Martin, Edward C.; Munoz, Carolina (College of Agriculture, University of Arizona (Tucson, AZ), 2017-02)
      La estimación acertada de la cantidad de agua aplicada a una parcela es crítica para cualquier esquema de manejo del riego. Muy a menudo, los agricultores aplican agua para hacer que la parcela y los surcos “se vean bien” (oscurecer las camas de los surcos) o continuan regando hasta que el agua llega al final de cada surco. Sin embargo, con frecuencia no tienen una idea precisa de cuanta agua han aplicado. Cuando los agricultores no toman en cuenta la eficiencia de sus sistemas de riego, pueden estar aplicando demasiada o muy poca agua. Muy poca agua ocasiona un estrés hídrico innecesario y puede resultar en reducciones de rendimiento. Demasiada agua puede causar estancamiento del agua, pérdida de nutrientes por excesiva infiltración y puede resultar en una pérdida de la cosecha. Reviewed 01/2017; Originally Published 04/2011.
    • Cómo Medir el Flujo de Agua en los Canales de Riego a Cielo Abierto y en las Tuberías de Compuertas

      Martin, Edward C.; Munoz, Carolina (College of Agriculture, University of Arizona (Tucson, AZ), 2017-02)
      La medición del agua en los sistemas de riego por gravedad es crítica para obtener el manejo óptimo y eficiente del agua. Sin conocer la cantidad de agua que se está aplicando a la parcela es difícil decidir adecuadamente cuando parar o cuándo hacer el siguiente riego. Para que un regador haga un manejo adecuado del agua debe saber el caudal o gasto, el tiempo total del riego y el tamaño de la superficie regada. A partir de estos datos se puede determinar la cantidad de agua que se aplicó a la parcela, lo cual entonces ayudará a determinar si el riego fue adecuado o no y cuándo se debería hacer el siguiente riego. Las decisiones en cuanto al manejo del riego deben hacerse en base a la cantidad de agua aplicada y a su relación con la demanda de consumo de las plantas y la capacidad del suelo para retener el agua. Revised 01/2017; Originally Published 12/2010.
    • Crop Growth and Development for Irrigated Chile (Capiscum annuum)

      Silvertooth, J.C.; Brown, Paul; Walker, Stephanie; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010-09)
    • Cross-commodity Guidelines for Neonicotinoid Insecticides in Arizona

      Palumbo, John C.; Ellsworth, Peter C.; Dennehy, Timothy J.; Entomology (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2003-05)
      Arizona enjoys a sustained recovery from the devastating whitefly outbreaks of the early 1990's. This success is built on an IPM strategy that includes the use of selective and effective chemistry. Admire has been a key soil insecticide protecting vegetables and produce throughout Arizona and is the first member of a burgeoning class of chemistry known as the neonicotinoids. New members of this valuable, reduced-risk, class of chemistry are now available to agricultural producers, placing a burden on users of these compounds to adopt rational plans for sustaining their efficacy. This consensus document represents our best guess efforts to limit and share this chemistry among different agricultural interests. Our goal is to preserve the long-term efficacy of the neonicotinoids and protect growers' interests in sustainable and economical whitefly management. Through identification of crop communities (i.e., "multi-crop", "cotton-intensive", and "cotton/melon") common to Arizona agriculture, we have sculpted sensible plans of use that should allow access to this valuable chemistry for everyone, while protecting it from resistance.
    • Cultural Practices for Karnal Bunt Control

      Ottman, Michael J (College of Agriculture, University of Arizona (Tucson, AZ), 2015-05)
      Environmental conditions between awn emergence and the end of flowering is the overriding factor in disease development. 2 The University of Arizona Cooperative Extension Cultural practices may be partially effective in controlling Karnal bunt but cannot eliminate the disease completely. Karnal bunt is most likely to be found in areas where lodging or water ponding have occurred.
    • Cultural Practices for Karnal Bunt Control

      Ottman, Michael; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2002-07)
      The weather near heading is the overriding factor in disease development. Cultural practices may be partially effective in controlling Karnal bunt, but cannot eliminate the disease completely.
    • Cultural Practices in the Production of Iceberg Lettuce in Southwestern Arizona

      Wilcox, Mark (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1994-06)
    • Damping Off

      Olsen, Mary W.; Young, Deborah; Plant Pathology (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-01)
      Damping off is caused by several different fungi under different environmental conditions. The fungi include Pythium, Rhizoctonia solani, and Thielaviopsis basicola. This article discusses the symptoms, environmental conditions, diseases, prevention and control methods for the damping-off caused by fungi.
    • Date Production in Arizona

      Powers, H. B. (College of Agriculture, University of Arizona (Tucson, AZ), 1945-05)
    • Dates in Arizona

      Tate, Harvey F.; Hilgeman, Robert H. (College of Agriculture, University of Arizona (Tucson, AZ), 1962-04)
    • Defoliating Cotton in Arizona

      Brown, Lamar C.; Ellwood, Charles C. (College of Agriculture, University of Arizona (Tucson, AZ), 1952-08)
    • Defoliating Cotton in Arizona, 1953

      Brown, Lamar C.; Ellwood, Charles C. (College of Agriculture, University of Arizona (Tucson, AZ), 1953-05)
    • Defoliating Cotton in Arizona, 1954

      Brown, Lamar C.; Ellwood, Charles C. (College of Agriculture, University of Arizona (Tucson, AZ), 1954-07)
    • Defoliation Timing for Arizona Cotton

      Norton, Randy; Wang, Guangyao (Sam); Loper, Shawna (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2012-03)
    • Determining the Mainstem Node Number for Cotton

      Silvertooth, Jeffrey C.; Brown, Paul W. (College of Agriculture, University of Arizona (Tucson, AZ), 2015-06)
      To systematically monitor a young crop effectively, it is important to understand the fundamentals about counting and identifying nodes on the plant. A mainstem node is simply the point on the plant stalk where a joint with a side branch (either vegetative or fruiting branch) is formed. The basic point of reference for counting nodes on a cotton plant are the cotyledonary nodes. The cotylendonary leaves are the first two leaves to appear as the plant emerges through the soil after planting, and are actually the former halves of the seed itself. Therefore, the cotyledons form the first nodes on the mainstem of the plant and they are the only nodes which are directly opposite one another, or parallel. When counting mainstem nodes we use the cotyledon nodes as 0, then counting subsequent nodes up the mainstem toward the terminal of the plant.
    • Diagnosing Home Citrus Problems

      Wright, Glenn C.; Begeman, John; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2009-04)
      Diagnosing Home Citrus Problems includes information on all the commonly encountered dooryard citrus problems encountered in Arizona. Problems/disorders are grouped into three catagories: problems with fruit, problems with leaves, and problems with stems, branches and entire tree. Symptoms, causes and control measures are given for each disorder.
    • Diagnosing Nutrient Deficiencies Quick-Reference

      Loper, Shawna; Area Extension Agent, Agriculture (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2014-02)
    • Diseases of Citrus in Arizona

      Olsen, Mary W.; Plant Pathology (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2000-04)
      This publication discusses some diseases that are sufficiently important to the citrus in Arizona. Topics include: -Parasitic Diseases -fungi / virus diseases / virus or virus-like diseases -Mycoplasma Diseases -Nematode Diseases -Nonparasitic Diseases
    • Diseases of Urban Plants in Arizona

      Olsen, Mary W.; Plant Pathology (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1999-04)
      Geographically, Arizona can be divided roughly into four areas, southwest, central, southeast, and northern. These regions correspond with four climatic zones, allowing a large and diverse number of plants to be grown for landscaping purposes. But, interestingly, in this desert environment many of the parasitic diseases in landscape plants are caused by a limited number of plant pathogens. This publication discusses some of those diseases that are sufficiently important to the urban plants in all areas Arizona.