Optimal crop choice and fertilizer applications depend on the stochastic dynamics of commodity prices, fertilizer prices, and the agronomic e↵ects of rotation versus monoculture. The e cient decision rule accounts for real option values associated with maintaining land disposition in an environment with highly uncertain future prices and irreversible past planting decisions. We parameterize a b...

J. Econ. Enlomol. 74: 30}-308 (1981) Larvae and adults of Phthorimaea operculella (Zeller) in potato foliage were effectively controlled by commercial applications of azinphosmethyl and a combination of methomyl and methamidophos, but eggs and pupae were not significantly affected. Azinphosmethyl, methomyl, and methamidophos provided adequate control of foliar larval populations, but larval par...

Abstract Pollination provided by bees is a critical ecosystem service for agricultural production. However, bee populations are at risk from stressors such as habitat loss, pesticides, and disease. On-farm wildflower plantings one mitigation strategy to provide resources bees. In many instances, government programs can subsidize the installation of these private landowners. Semi-natural (SNH) i...

Sustainable agriculture relies on pollinators, and wild bees benefit yield of multiple crops. However, the combined exposure to pesticides loss flower resources, driven by agricultural intensification, contribute declining diversity abundance many bee taxa. Flower plantings along margins fields offer diverse food resources not directly treated with pesticides. To investigate potential mitigate ...

twenty local and foreign maize (zea mays l.) hybrids in five different maturity groups were evaluated in mashhad, iran for two years (2007-2009). three planting dates (5th may, 20th may and 5th june) and hybrids were arranged in a randomized complete block design as split plot arrangements, with three replications. the planting dates were in main plots and hybrids in subplots. the results indic...

The apple tree is a leading fruit crop in Ukraine terms of production volumes and planting areas valuable food product with high content vitamins. In new modern plantings, producers prefer intensive cultivation technologies that ensure the maximum amount high-quality yield per unit area. main criterion for solving this problem design plantings: narrow-row scheme trees low-volume crown shape. pu...