Results 51 to 60 of about 74,000 (316)
Maize initial development as affected by nitrogen sources and rates at sowing time [PDF]
Biotemas, 2009 The growth of notillage has stimulated an increase in nitrogen applied at maize sowing time. This work was carried out aiming to evaluate the effects of nitrogen fertilizer sources and rates on maize germination.
Paula Bianchet +2 more
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Atmosphere, 2014 The air-sea exchange of two legacy persistent organic pollutants (POPs), γ-HCH and PCB 153, in the North Sea, is presented and discussed using results of regional fate and transport and shelf-sea hydrodynamic ocean models for the period 1996–2005.
Kieran O'Driscoll
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Using DNDC Model to Help Mitigate Ammonia Volatilization from Paddy Fields
Guan'gai paishui xuebao, 2023 【Objective】 Reducing nitrogen loss from leaching and emissions is essential to increasing nitrogen fertilizer use efficiency in developing sustainable agriculture.
BI Wentong +4 more
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A low environmental impact system for fertirrigation of maize with cattle slurry [PDF]
, 2016 The applicability of an alternative system for managing and distributing cattle slurry during irrigation on maize was evaluated. An experiment was carried out by equipping a traveller boom with drop tubes and fed from a hose-reel machine.
Bortolini, Lucia
core +1 more source
Computational Study on Parametric Variation with Solar Heat Induction of an Entrained Flow Gasifier
Energies, 2022 Gasification has played an important role in the sustainable use of waste biomass, providing useful combustible gases in the process. Gasification has an important role in waste management and promotes energy independence for many oil-deficit countries ...
Anirudh Singh +3 more
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Current Biology, 2010 Plant volatiles are the metabolites that plants release into the air. The quantities released are not trivial. Almost one-fifth of the atmospheric CO2 fixed by land plants is released back into the air each day as volatiles. Plants are champion synthetic chemists; they take advantage of their anabolic prowess to produce volatiles, which they use to ...
openaire +3 more sources
SSRN Electronic Journal, 2014 Estimating volatility from recent high frequency data, we revisit the question of the smoothness of the volatility process. Our main result is that log-volatility behaves essentially as a fractional Brownian motion with Hurst exponent H of order 0.1, at any reasonable time scale.
Gatheral, Jim +2 more
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Philosophical Transactions of the Royal Society B: Biological Sciences, 2010 The high food prices experienced over recent years have led to the widespread view that food price volatility has increased. However, volatility has generally been lower over the two most recent decades than previously. Variability over the most recent period has been high but, with the important exception of rice, not out of line with historical ...
C. L. Gilbert, C. W. Morgan
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Estimating Stochastic Volatility under the Assumption of Stochastic Volatility of Volatility [PDF]
Risks, 2020 We propose novel nonparametric estimators for stochastic volatility and the volatility of volatility. In doing so, we relax the assumption of a constant volatility of volatility and therefore, we allow the volatility of volatility to vary over time. Our methods are exceedingly simple and far simpler than the existing ones. Using intraday prices for the
Moawia Alghalith +2 more
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Effect of rice intermittent irrigation on nitrogen cycle and emission in a lysimeter study [PDF]
Caspian Journal of Environmental SciencesAlthough intermittent irrigation is widely regarded as a saving irrigation water technology in paddy fields, it can cause water and air pollution by changing the nitrogen cycle.
Atefeh M. Soltani, Maryam Navabian
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