نتایج جستجو برای: agricultural production

تعداد نتایج: 683171  

2012
Hang Chen Guifen Chen

China is a populous agricultural country, the arable land is the most basic resources which is needed for agricultural production, the quality of arable land has a direct impact on the entire agricultural production and development ,so to carry out the Evaluation of Farmland is a very important foundation work which is advantage to know china’s arable land resources and to improve the efficienc...

Journal: :اقتصاد و توسعه کشاورزی 0
عادله اسمعیلی دستجردی پور حسین مهرابی بشرآبادی

extension of trade liberalization in countries is cause to increasing amount of goods in different sectors. exploit of global trade by increasing competitive power was regarded by researchers and policymakers in different countries. whereas abundance of production factor is one of the agent that makes advantage and qualitative land and labor force are two abundance production factors in agricul...

Journal: :Environmental entomology 2014
Faye E Benjamin Rachael Winfree

Modern agriculture relies on domesticated pollinators such as the honey bee (Apis mellifera L.), and to a lesser extent on native pollinators, for the production of animal-pollinated crops. There is growing concern that pollinator availability may not keep pace with increasing agricultural production. However, whether crop production is in fact pollen-limited at the field scale has rarely been ...

2007
P. Chabrier

The pressing need in adapting and improving farming practices has motivated research efforts to extend the classical analysis of plants and crops to consideration of more complex cropping systems up to farming systems and small regional agroecosystems. Sustainability concerns raise production management issues that are gaining increasing attention in research. This shift of scientific interest ...

Journal: :Trends in ecology & evolution 2010
Simon G Potts Jacobus C Biesmeijer Claire Kremen Peter Neumann Oliver Schweiger William E Kunin

Pollinators are a key component of global biodiversity, providing vital ecosystem services to crops and wild plants. There is clear evidence of recent declines in both wild and domesticated pollinators, and parallel declines in the plants that rely upon them. Here we describe the nature and extent of reported declines, and review the potential drivers of pollinator loss, including habitat loss ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران - دانشکده منابع طبیعی 1385

چکیده ندارد.

The realization of sustainable development depends on the efficient use of energy resources. Energy consumption productivity and efficiency are among important indices that play a critical role in explaining the behavior of energy consumption structure of different economic sectors, which in turn, plays a key role in policy making. From among economic sectors, the agriculture sector, as an impo...

2006
A. S. Oyekale

This study used an ECM to analyze the determinants of agricultural land expansion in Nigeria. Results show that at first differencing, Augmented Dickey Fuller test indicated stationarity for all the variables (p< 0.05) and there were 7 cointegrating vectors using Johansen test. The dynamic unrestricted short-run parameters of permanent cropland growth rates (68.62), agricultural production inde...

2017
William Kolby Smith Cory C. Cleveland Sasha C. Reed Steven W. Running W. Kolby Smith

Driven by global population and standard of living increases, humanity co-opts a growing share of the planet’s natural resources resulting in many well-known environmental trade-offs. In this study, we explored the impact of agriculture on a resource fundamental to life on Earth: terrestrial vegetation growth (net primary production; NPP). We demonstrate that agricultural conversion has reduced...

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