The spatial concentration of ideas is central to economic geography. Yet, how proximity to research affects productivity is not well studied. We use the late 19th century establishment of agricultural experiment stations in the United States to estimate the importance of proximity to research for productivity growth. Our analysis of county-level agricultural census data from 1870 to 2000 reveal...

Prof. Maryam Shokri was born in 1950, in Sari city, Iran, where she got her diploma certificate. She received her B.Sc. degree in Natural Resources from Tehran University during 1969 to 1973. She employed the Environmental Organisation as teacher in High School in Environment during 1973-1975. She received a scholarship position from the Buali Sina University to finish her M.Sc. degree from Mon...

Pesticides stored at or close to the soil surface after field application can be mobilized and transported off the field when surface runoff occurs. The objective of our study was to quantify the potential pesticide losses in surface runoff from a conventionally managed agricultural field in a Swedish climate. This was achieved by measuring surface runoff volumes and concentrations in runoff of...

In 2005, the Federal Lands Recreation Enhancement Act gave public land agencies discretion in the management of funds collected through recreation fees. However, this legislation is set to expire in 2015, which will lead to a reduction in available financial resources to maintain recreation services and to protect the environment. We use a unique dataset to analyze the impact of changes in fee ...

The research carried out at Voinesti research-development station for fruit growing, considered highlighting the performance characteristics of some apple varieties with genetic resistance to diseases, approved in period 2004 - 2020.
 vigour growth 10th year trees, grafted on M.9 rootstock, is well defined by trunk circumference, which records values between 14.9cm Cezar variety and 18.4cm...

the purpose of present work is to survey cultural and social factors affecting the attitudes of shirvan and chardavol county farmers toward agricultural water management. data was gathered through a field research and survey, using interviews and the questionnaire that was prepared for this purpose. the statistical population consisted of all the farmers (wheat cultivators) of shirvan & chardav...

the purpose of this research was studying relationship between socio- cultural, economical and managerial factors with the participation rate of agricultural cooperative's members in the shirvan chardavol township in the ilam province, iran. the method of this study is descriptive-correlative. a researcher made questionnaire was used as the tool for gathering data. the face and content validity...

Terminal heat stress leads to significant yield reduction in wheat. Thus, the determination of tolerant genotypes is major importance wheat breeding program. The present study was conducted at Shandaweel agricultural research station, Sohag, Egypt during 2019/2020 and 2020/2021 growing seasons, evaluate twelve bread under normal sowing (20 November) late (30 December) dates, experiment set up a...

In spring 1995, an eastern cottonwood (Populus delfoides) plantation was established on a former agricultural field in Sharkey County, MS to evaluate the effects of clonal variety and mechanical weed control on aboveground biomass production. Four cottonwood clones, ST-66, ST-72, ST-75 and S7C-1 were planted on a 12 foot x 12 foot spacing and subjected to 2 mechanical weed control treatments (d...