Results 71 to 80 of about 417,353 (209)

A laser technique for characterizing the geometry of plant canopies [PDF]

open access: yes
The interception of solar power by the canopy is investigated as a function of solar zenith angle (time), component of the canopy, and depth into the canopy.
Bauer, M. E.   +2 more
core   +1 more source

Contribution of leaf specular reflection to canopy reflectance under black soil case using stochastic radiative transfer model [PDF]

open access: yes, 2018
Numerous canopy radiative transfer models have been proposed based on the assumption of “ideal bi-Lambertian leaves” with the aim of simplifying the interactions between photons and vegetation canopies.
Knyazikhin, Yuri   +3 more
core   +1 more source

Estimating Cotton Nitrogen Nutrition Status Using Leaf Greenness and Ground Cover Information

open access: yesRemote Sensing, 2015
Assessing nitrogen (N) status is important from economic and environmental standpoints. To date, many spectral indices to estimate cotton chlorophyll or N content have been purely developed using statistical analysis approach where they are often subject
Farrah Melissa Muharam   +3 more
doaj   +1 more source

Aerodynamic characteristics of a hypersonic parachute [PDF]

open access: yes, 1961
Newtonian theory, both in the form of the Modified-Newtonian and the Newton- Busemann pressure laws, is used to find the shape, cloth area and drag of the axisymmetric canopy of a hypersonic parachute, whose only load-carrying fibres are longitudinal ...
Boyd, E. A.
core  

Tree Canopies Drive δ13C and δ15N Patterns in Mediterranean Wood Pastures of the Iberian Peninsula

open access: yesLand
Mediterranean wood pastures are the result of traditional silvo-pastoral uses that shaped these ecosystems into a mosaic of trees and open grassland.
Mercedes Ibañez   +6 more
doaj   +1 more source

Changes in forest ecosystem stability under climate change in a temperate landscape

open access: yesFrontiers in Forests and Global Change
Climate change poses significant threats to forests globally. Understanding the relationship between environmental variables and species distribution is crucial for evaluating the vulnerability of tree species assemblies to anticipated climate change ...
Pavithra Rangani Wijenayake   +6 more
doaj   +1 more source

Response of leaf area and dry matter of crop, weeds and cover crops to competition and fertilizer resources

open access: yesActa Agriculturae Slovenica, 2014
Plasticity of plants to allocate leaf area and dry matter to upper layer of canopy play important role in canopy architecture and competition. In order to study the vertical distribution of leaf area and dry matter of corn (Zea mays L.), cover crops and ...
Fahimeh DADASHI   +4 more
doaj   +1 more source

Let there be light : light interception method update for oil palm (Elaeis guineensis Jacq.) canopies [PDF]

open access: yes, 2018
Light interception (photosynthetically active radiation, PAR) experiments in oil palm (Elaeis guineensis Jacq.) plantations are scarce and often performed decennia ago, in Southeast Asia and without a clear methodology.
Bonneau, Xavier   +4 more
core   +1 more source

Conception, Consequences and Design of Cool Climate Viticulture Training Systems

open access: yesAgriculture
In this review, the problems, challenges and opportunities of trellis design are dealt with in the conditions of cool climate viticulture influenced by climate changes.
Richard Danko   +3 more
doaj   +1 more source

Analysis of soil and species composition [PDF]

open access: yes
Measurements were made during May to October, 1987 and June to August, 1989 over a tallgrass prairie near Manhattan, Kansas. Soil at the experimental site is predominantly Dwight silty clay loam.
Verma, Shashi B.
core   +1 more source

Home - About - Disclaimer - Privacy