Results 91 to 100 of about 82,118 (312)
An Economic Valuation of Pollination Services in Georgia [PDF]
The production of many crops depends on biotic pollination. As pollinator populations decline, assessments of the potential consequential loss of economic value are critical.
Bergstrom, John C. +2 more
core +1 more source
American Journal of Agricultural Economics, EarlyView.Abstract Germany's Renewable Energy Sources Act (REA), enacted in 2000 and subsequently amended, subsidized national renewable energy production with fixed feed‐in tariffs for renewable energy sources (RE) from wind, solar, and biogas. Empirical studies suggest that the policy was creating windfall effects for landowners and attribute farmland use ...
Lars Isenhardt +6 more
wiley +1 more source
The Effect of Flower Development and Pollination on the Fruit Set of Kalanchoe [PDF]
, 2014 鵝鑾鼻燈籠草及其變種花朵開放後4天，花柱明顯的伸長並與花藥相互接觸。長壽花'Isabella'於開花當天，花柱已與花冠內下層的花藥相接觸，於花朵開放後1天，花柱已伸出花藥之外。三種親本以人工雜交、人工自交、自交(套袋使其授粉)、開放授粉或除雄後套網處理，結果以人工自交以或開放授粉能得到最多種子，其次為人工雜交授粉，自花授粉處理種子數較少，而以除雄後再套網處理者則未收得任何種子。使用鵝變鼻燈籠草為母本與長壽花'Isabella'雜交時，每朔果中平均收得135顆種子，反交時每朔果中平均收得33粒種子。The
侯宇龍 +3 more
core
American Journal of Agricultural Economics, EarlyView.Abstract While multiple factors explain low adoption rates of improved varieties by small‐scale farmers in sub‐Saharan Africa, a key supply‐side constraint is the limited availability of seed embodying new traits in the volume, quality, price, and timeliness required by farmers. This constraint is partly attributable to classical failures in the market
Dawit Mekonnen +5 more
wiley +1 more source
Pollinator effectiveness and pollination dependency of bilberry (Vaccinium myrtillus) in Swedish hemi-boreal forests [Elektronisk resurs] [PDF]
Intensification of forest management to increase production of biomass has resulted in considerable habitat degradation with negative impacts on insect biodiversity, including beneficial insect groups such as pollinators.
Bartholomée, Océane, +4 more
core +1 more source
Climate change and perennial crop production: Evidence of yield impact and adaptation in California
American Journal of Agricultural Economics, EarlyView.Abstract Perennial crops are economically important. They contribute to food security, providing essential nutrients that are often lacking in annual crops, and provide additional environmental benefits compared with annual crops. Despite their importance, empirical research on the impacts of climate change and adaptation on perennial crops remains ...
Yuanyuan Wen +2 more
wiley +1 more source
A decline in pollinator dependent vegetable crop productivity in India indicates pollination limitation and consequent agro-economic crises. [PDF]
, 2011 Approximately 70% of the tropical crop species depend on pollinators for optimum yields (Roubik, 1995, Klein 2007). The economic value of such pollinated crops to India is $726 million and India is the world's second largest vegetable producer ...
Ritam Bhattacharya +2 more
core +1 more source
Self-fertility studies of some sweet cherry (Prunus avium L.) cultivars and selections
International Journal of Horticultural Science, 2004 Fruit set of two sweet cherry cultivars (Alex' and 'Stella' ) and four Hungarian selections have been studied over two years following open pollination, unassisted self-pollination (autogamy) and artificial self-pollination (geitonogamy).
Zs. Békefi
doaj +1 more source
High‐elevation endemic plants predicted to lose habitat from changing climate in Washington State
American Journal of Botany, EarlyView.Abstract Premise High‐elevation plants face unique challenges from potential climate change impacts that will likely require upslope migration into increasingly smaller suitable habitat. This situation is particularly acute for endemic species that by definition occupy small geographic ranges.
Nicholas L. Gjording +4 more
wiley +1 more source
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 +4 more
wiley +1 more source