Results 51 to 60 of about 223,542 (302)

Evaluating nitrogen uptake: Methods and applications for plant research

open access: yesApplications in Plant Sciences, EarlyView.
Abstract Nitrogen is an essential nutrient for the growth and development of plants, aiding many physiological and biological functions. Due to the high demand for the nutrient, it is common for agricultural production systems to fertilize crop fields with large quantities of nitrogen.
Emilia Pierce   +3 more
wiley   +1 more source

CANOPY STRUCTURE AND DEPOSITION EFFICIENCY OF VINEYARD SPRAYERS [PDF]

open access: yesJournal of Agricultural Engineering, 2007
A field study was performed to analyse how deposition efficiency from an axial-fan sprayer was affected by the canopy structure of vines trained to the High Cordon, Low Cordon and Casarsa systems, at beginning of flowering and beginning of berry touch growth stages.
PERGHER, Gianfranco, PETRIS R.
openaire   +4 more sources

Cutting Through the Green: A Case for Grassland Archaeology Using UAV Multispectral Data

open access: yesArchaeological Prospection, EarlyView.
ABSTRACT Advances in low‐altitude remote sensing are needed to improve the effectiveness of archaeological prospection in the Netherlands. The geomorphological situation and land use history make applying various remote sensing and geophysical technologies particularly challenging.
Roeland Emaus
wiley   +1 more source

The Potential of Multispectral Imagery and 3D Point Clouds from Unoccupied Aerial Systems (UAS) for Monitoring Forest Structure and the Impacts of Wildfire in Mediterranean-Climate Forests

open access: yesRemote Sensing, 2021
Wildfire shapes vegetation assemblages in Mediterranean ecosystems, such as those in the state of California, United States. Successful restorative management of forests in-line with ecologically beneficial fire regimes relies on a thorough understanding
Sean Reilly   +5 more
doaj   +1 more source

Prospecting of Architectural Features Using LiDAR‐UAV Technology, Deep Neural Networks and Visualization Techniques: A Case Study in Kuélap and Cambolín (NW Peru)

open access: yesArchaeological Prospection, EarlyView.
ABSTRACT High‐resolution and accurate synoptic images of terrestrial topography, even in densely forested areas, have proven valuable for archaeology by enabling the identification and characterization of relief patterns associated with ancient human activities. This study presents a novel approach that integrates digital terrain models (DTMs) obtained
Jhon A. Zabaleta‐Santisteban   +13 more
wiley   +1 more source

Canopy openness and soil conditions explain community structure and diversity in a tropical seasonal forest in south-eastern Brazil

open access: yesActa Botânica Brasílica, 2022
In tropical semi-deciduous forests, where 20-50 % of canopy trees shed their leaves in the dry season, species with varying degrees of leaf deciduousness share the same space and resources.
Tiago Egydio Barreto   +5 more
doaj   +1 more source

Rice panicle temperature and crop microclimate in stressful thermal environments: toward a model of spikelet sterility [PDF]

open access: yes, 2011
Rice inflorescences are sensitive to chilling and heat, resulting in spikelet sterility. It is not the air temperature itself, however, that causes the stress but the temperature of the sensitive tissues during specific developmental stages.
Dingkuhn, Michaël, Julia, Cécile
core  

Forest disturbance and recovery: A general review in the context of spaceborne remote sensing of impacts on aboveground biomass and canopy structure [PDF]

open access: yes, 2009
Abrupt forest disturbances generating gaps \u3e0.001 km2 impact roughly 0.4–0.7 million km2a−1. Fire, windstorms, logging, and shifting cultivation are dominant disturbances; minor contributors are land conversion, flooding, landslides, and avalanches ...
Chambers, Jeffrey Q   +5 more
core   +3 more sources

Roles of horizontal and vertical tree canopy structure in mitigating daytime and nighttime urban heat island effects

open access: yesInternational Journal of Applied Earth Observations and Geoinformation, 2020
The urban heat island (UHI) is increasingly recognized as a serious, worldwide problem because of urbanization and climate change. Urban vegetation is capable of alleviating UHI and improving urban environment by shading together with evapotranspiration.
Jike Chen, Shuangen Jin, Peijun Du
doaj   +1 more source

Trade-offs among ecosystem services and productivity in coffee-based agroforestry systems in Nicaragua [PDF]

open access: yes, 2019
Many studies have measured biodiversity loss across the coffee intensification gradient; some studies have shown, with contradictory results, the trade-offs between biodiversity loss and coffee production increments.
Bucardo, E.M.   +5 more
core  

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