103,096 research outputs found
Fertilizer
No full textMineral fertilizers have played a pivotal role in the success of the agricultural production systems. Continued exponential growth in human population and increasing demand for biofuels point to ever-increasing demand for fertilizers. Despite the apparent success of the current agricultural production systems, overuse of fertilizers has caused severe environmental problems and increasing numbers of health concerns. Overapplication was, and in many places is still, thought to be an insurance policy against yield-limiting nutrient losses. Moreover, increasingly affluent societies have also changed their dietary preference dramatically increasing meat consumption. This demand has resulted in significant changes in animal agriculture with larger concentrations of livestock. The increase in concentration of animals has compounded environmental contamination problems associated with the disposal of the resulting manures. Overall, environmental and human health concerns associated with fertilizer overapplications are the result of two main problems: (1) the disruption of the natural nitrogen and phosphorus nutrient cycles because of the massive infusion of nitrogen and phosphorus fertilizers; and (2) the inadvertent release of heavy metals and radionuclides from mineral fertilizers and pathogens, veterinary pharmaceuticals, and endocrine disrupters from organic fertilizers. This article will discuss these issues and their environmental and health consequences in detail. Finally, a case study will be used to illustrate how agricultural landscapes can be redesigned to reduce these consequences
Investigation of spraying efficiency of an aerial spraying system in a super-high density olive grove in Greece
No full text
Smartirrigation Apps: Urban Turf
No full textAs freshwater resources become increasingly scarce, efficient irrigation scheduling methods that allow efficient irrigation water uses are required. Migliaccio et al. (2016) have developed an app called Smartirrigation Turf, an easy-to-use mobile tool that delivers information to improve irrigation scheduling for urban turf. The app was only available for Florida and Georgia, but recently, we have made improvements to the app and made it available to any location throughout the contiguous United States. The 7-page major revision, written by Haimanote K. Bayabil, K. W. Migliaccio, J. H. Debastiani Andreis, C. Fraisse, K. T. Morgan, and G. Vellidis, and published by the UF/IFAS Department of Agricultural and Biological Engineering, describes the changes made on the recently released Smartirrigation Turf app.
https://edis.ifas.ufl.edu/ae499
Originally published: Migliaccio, Kati, J. H. Andreis, Clyde Fraisse, Kelly Morgan, and G. Vellidis. 2013. “Smartirrigation Apps: Urban Turf”. EDIS 2013 (9). https://journals.flvc.org/edis/article/view/121158
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
Developing crop canopy model for irrigation of high-density olive groves by using UAV imagery
No full textPlant architecture is a key issue in understanding olive tree water needs. The aim of this study is to evaluate water requirements of a high-density olive grove by coupling an agro-hydrological model with UAV-based, high-resolution 2D imagery and 3D structure from motion (SfM) reconstruction. Three planting densities (1670, 1000, 500 trees ha-1) were drip irrigated according to two irrigation regimes. Evapotranspiration was estimated using FAO56 and FAO66-modified approaches. FAO66 input data (canopy volume and coverage) were quantified using manual ground-based surveys, 2D imagery and 3D SfM reconstruction. 2D imagery showed better relationships to ground-based area and volume estimates than the 3D SfM approach. Moreover, coupling the ET model with 2D data accurately predicted crop water needs
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