نتایج جستجو برای: agricultural field

تعداد نتایج: 876417  

2008
Nurit Agam William P. Kustas Martha C. Anderson Fuqin Li Paul D. Colaizzi

[1] The utility of a thermal image sharpening algorithm (TsHARP) in providing fine resolution land surface temperature data to a Two-Source-Model for mapping evapotranspiration (ET) was examined over two agricultural regions in the U.S. One site is in a rainfed corn and soybean production region in central Iowa. The other lies within the Texas High Plains, an irrigated agricultural area. It is ...

2017
Michael L. Mann James M. Warner

Despite the routine collection of annual agricultural surveys and significant advances in GIS and remote sensing products, little econometric research has integrated these data sources in estimating developing nations' agricultural yields. In this paper, we explore the determinants of wheat output per hectare in Ethiopia during the 2011-2013 principal Meher crop seasons at the kebele administra...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد 1376

in this thesis our aim is to construct vector field in r3 for which the corresponding one-dimensional maps have certain discontinuities. two kinds of vector fields are considered, the first the lorenz vector field, and the second originally introced here. the latter have chaotic behavior and motivate a class of one-parameter families of maps which have positive lyapunov exponents for an open in...

2012
Rupak Goswami Malay Paul

Agricultural extension has often been conceptualised to embrace a broadened mandate that goes beyond transferring technologies and facilitating agricultural development. International organisations have started to shift from ‘agricultural’ to ‘rural’ focus in their programmes and Extension’s success in future may not be judged in terms of technology transfer or agricultural development alone. N...

2013
Lori Beaman Dean Karlan Bram Thuysbaert Christopher Udry

Intensified use of agricultural inputs, particularly fertilizer, is a possible route to improved agricultural productivity. Field trials of these technologies show substantial increases in yields, but typically are done on highly monitored experimental plots rather than by farmers themselves. Returns to a certain technology might be quite different on real-world farms than on experimental farms...

2010
Marcelo Ardón Shaena Montanari Jennifer L. Morse Martin W. Doyle Emily S. Bernhardt

[1] Wetland restoration is a commonly used approach to reduce nutrient loading to freshwater and coastal ecosystems, with many wetland restoration efforts occurring in former agricultural fields. Restored wetlands are expected to be effective at retaining or removing both nitrogen and phosphorus (P), yet restoring wetland hydrology to former agricultural fields can lead to the release of legacy...

2010
Sara A. Quandt Haiying Chen Joseph G. Grzywacz Quirina M. Vallejos Leonardo Galvan Thomas A. Arcury

BACKGROUND Farmworkers can be exposed to a wide variety of pesticides. Assessing cholinesterase activity over time can be used to monitor exposure to organophosphorus and carbamate pesticides. OBJECTIVES The goal of this study was to document patterns and variation in cholinesterase levels across the agricultural season (May-August) among field-workers, and to explore the association of choli...

Journal: :Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering 2008
Patrick G Hunt Terry A Matheny Kyoung S Ro Kenneth C Stone Matias B Vanotti

Nonpoint source nitrogen is recognized as a significant water pollutant worldwide. One of the major contributors is agricultural drainage line water. A potential method of reducing this nitrogen discharge to water bodies is the use of immobilized denitrifying sludge (IDS). Our objectives were to (1) produce an effective IDS, (2) determine the IDS reaction kinetics in laboratory column bioreacto...

Journal: :International Journal of Engineering & Technology 2018

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