Results 141 to 150 of about 4,672,682 (301)

Optimal design and experimental research on the spiral groove wheel fertilizer apparatus

Scientific Reports
As the "core" of fertilizer machinery, the fertilizer apparatus has a significant impact on the effect of fertilization operation. At present, the straight-grooves type external groove wheel fertilizer apparatus is widely used, which has the problem that
Fujun Wen, Honghai Wang, Lai Zhou, Qingchuang Zhu   +3 more
doaj   +1 more source

Self Study

, 2013
Department of Political Science Self Study Report for Academic Program ReviewDepartment of Political Science Self Study Report Academic Program ReviewDepartment of Political Science Self Study Report Academic Program ...
Academic Program Review, APR, Political Science, Self Study, Department of Political Science, Self Study Report   +2 more
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Improving access to new technologies: An experiment with Kenyan input sellers

American Journal of Agricultural Economics, EarlyView.
Abstract Agrodealers play a critical role in rural economies, selling essential inputs for agricultural production, stocking new products, and providing farmers with technical advice. However, uncertainty can discourage them from stocking newer, less familiar products, limiting the availability of innovative technologies and leading to market failures ...
Sarah W. Kariuki, Francisca N. Muteti, Annemie Maertens, Michael Ndegwa, Hope Michelson, Mercy Mbugua, Jason Donovan   +6 more
wiley   +1 more source

ECONOMICALLY OPTIMAL NITROGEN FERTILIZATION FOR YIELD AND PROTEIN IN HARD RED SPRING WHEAT [PDF]

This analysis determines profit maximizing N fertilization levels of hard red spring wheat (HRSW) for various wheat prices, N prices, and protein-based HRSW price premium/discount (P/D) structures for south eastern Washington data.
Pan, William, Huggins, David R., Young, Douglas L., Baker, Dustin   +3 more
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Firm turnover under asymmetric information: Tanzania's agro‐dealer sector

American Journal of Agricultural Economics, EarlyView.
Abstract We study firm turnover (i.e., entry and exit) and its consumer implications in a market characterized by asymmetric information. Using a three‐round census of agro‐dealers in Tanzania's Morogoro Region, we document annual firm entry and exit rates of 33% and 17%, respectively.
Alix Naugler, Hope Michelson, Sarah Janzen, Christopher Magomba   +3 more
wiley   +1 more source

Can ploidy changes propel the evolution of allogamy in a selfing species complex?

BMC Plant Biology
Background The transition to self-fertilization has occurred repeatedly across diverse plant groups, and the evolutionary consequences of selfing typically suggest that a shift toward outcrossing is unlikely.
Ana García-Muñoz, Camilo Ferrón, Celia Vaca-Benito, Carlos Olmedo-Castellanos, María Nazaret Martínez-Gómez, Tatiana López-Pérez, Mohammed Bakkali, Sílvia Castro, Mariana Castro, João Loureiro, A. Jesús Muñoz-Pajares, Mohamed Abdelaziz   +11 more
doaj   +1 more source

Self-concepts of primary students with mild intellectual disabilities : issues of measurement and educational placement

, 2000
The educational placement of students with mild intellectual disabilities remains controversial. Arguments for educational placement are often based upon the anticipated impact upon self-concept.
Tracey, Danielle K. (R13635), Marsh, Herbert W. (R8137)   +1 more
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Interactions between maternal provisioning and natural selection on seed mass fluctuate across heat waves

American Journal of Botany, EarlyView.
Abstract Premise Changing climates are leading to more frequent and severe heat waves, potentially threatening plant populations. Both acclimation to stress and selection for heat‐escape or heat‐resistance phenotypes occur during heat waves. However, plastic responses and selection do not necessarily interact cohesively—even producing trait responses ...
Lana F. Gaspard, Elissa Harb, Stacy D. Holt Jr., Courtney M. Patterson, Nicholas J. Kooyers   +4 more
wiley   +1 more source

Arbosana Olive Is Self-Incompatible, but Inter-Compatible with Some Other Low-Vigor Olive Cultivars

Horticulturae
Trendy high-density olive fields are often monovarietal orchards, mostly using the cultivar Arbequina. However, Arbequina shows a strong self-incompatibility response, and its yields depend on wind cross-pollination, which is not always available.
Julián Cuevas, Fernando M. Chiamolera, Virginia Pinillos, Francisco Rodríguez, Irene Salinas, Diego Cabello, Alenka Baruca Arbeiter, Dunja Bandelj, Marina Raboteg Božiković, Gabriela Vuletin Selak   +9 more
doaj   +1 more source

Reproductive assurance through self-fertilization does not vary with population size in the alien invasive plant Datura stramonium

, 2007
Autonomous self-fertilization is suggested to be associated with invasiveness in plants because it offers reproductive assurance when there is a shortage of suitable mates or pollinators.
van Kleunen, Mark, Johnson, Steven, Markus Fischer, Mark van Kleunen, Steven D. Johnson, Fischer, Markus, Johnson, Steven D.   +6 more
core   +1 more source