scholarly journals The economics of growing shrub willow as a bioenergy buffer on agricultural fields: A case study in the Midwest Corn Belt

2016 ◽  
Vol 10 (6) ◽  
pp. 776-789 ◽  
Author(s):  
Herbert Ssegane ◽  
Colleen Zumpf ◽  
M. Cristina Negri ◽  
Patty Campbell ◽  
Justin P. Heavey ◽  
...  
Author(s):  
K. Kanja ◽  
M. Mwemba ◽  
K. Malunga

<p><strong>Abstract.</strong> Rapid population growth and rural-urban migration amidst limited job opportunities lead to conversion of land from forests into agriculture and other land uses. In this study, Zambia’s Mwekera national forest reserve was used as a case study to assess the rate of expansion of agricultural fields using remote sensing and GIS. Iterative Self-Organizing Data Analysis Technique (ISODATA) as well as maximum likelihood supervised classification on four Landsat images as well as accuracy assessment of the classifications was performed. Over the period under observation, results indicate annual percentage changes to be &amp;minus;0.03, &amp;minus;0.49 and 1.26 for agriculture, forests and settlement respectively indicating a higher conversion of forests into human settlements and agriculture.</p>


2012 ◽  
Vol 49 (6) ◽  
pp. 1373-1383 ◽  
Author(s):  
Luísa G. Carvalheiro ◽  
Colleen L. Seymour ◽  
Susan W. Nicolson ◽  
Ruan Veldtman

1991 ◽  
Vol 51 (1) ◽  
pp. 101-123 ◽  
Author(s):  
Sally Clarke

Based on the cost savings of tractors relative to horses, nearly twice as many farmers in the Corn Belt should have invested in tractors as actually did so in the 1920s. During the Great Depression, however, the proportion of farmers owning tractors jumped from 25 to 40 percent. I argue that financial barriers explain farmers' reluctance to buy this expensive invention during the 1920s, while two New Deal regulatory agencies altered farmers' investment climate and spurred the adoption of capital equipment.


1980 ◽  
Vol 62 (1) ◽  
pp. 142-145 ◽  
Author(s):  
Jeffrey Apland ◽  
Bruce A. McCarl ◽  
William L. Miller

2018 ◽  
Author(s):  
Malcolm McCallum ◽  
Stanley E. Trauth

AbstractThe range of the Illinois chorus frog (Pseudacris streckeri illinoensis) in Arkansas is restricted to the eastern quarter of Clay County. Nearly 100% of this species’ native sand-prairie habitat has been converted to agricultural fields. The original range of the Illinois chorus frog encompassed at least 9,982 ha. Although two new localities were identified in 2002, the current range is only 4,399 ha in 2002. This represents a 56% range contraction since 1992. Calling was heard in only 44.5% of its original range. This species may be experiencing a severe range contraction. Decay models predict the extirpation of the Illinois chorus frog in Arkansas within 17.5 to 101 yr. Suggested factors contributing to this range contraction may include drought, pesticide use, changes in surface water hydrology, U.S. E.P.A. Best management practices, and this species’ limited ability to recolonize extirpated sites.


2021 ◽  
Author(s):  
Marcos Paulo Gomes Gonçalves

The meteorological factors study in the beetle population dynamics, as well as its association with vegetation, is of fundamental importance for understanding the variation that occurs in its population. Thus, it was reported the influence of temperature, humidity, insolation and precipitation on the beetles in general and it was presented a case study that examined the relationship between time and population fluctuation of curculionids in Mata de Cocal and an area used for crop rotation and animal grazing, in the city of Teresina, Brazil, from August 2011 to July 2012. It was verified that beetles populations certain are governed and conditioned by meteorological variables to a greater or lesser extent depending on the characteristics of the community itself and the biotic and abiotic environmental factors of the area where they live: the temperature that changes the its metabolic rate, the insolation and humidity that can affect its fertility and longevity can be cited as examples. From the case presented, It was found that the Curculionidae community has a positive association with precipitation and humidity and a negative association with insolation and temperature, being that in native forests curculionids are not as dependent on meteorological variables as in agricultural fields.


2015 ◽  
Vol 64 (5) ◽  
pp. 703-716 ◽  
Author(s):  
Aneta Trajanov ◽  
Vladimir Kuzmanovski ◽  
Florence Leprince ◽  
Benoit Real ◽  
Alain Dutertre ◽  
...  

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