Results 261 to 270 of about 7,368 (293)

Consequences of breeding on biomass, radiation interception and radiation-use efficiency in wheat

Field Crops Research, 1997
Abstract Field experiments were conducted during 1991 and 1992 to identify the effect of wheat breeding on crop biomass production and its physiological determinants, i.e. radiation interception and radiation-use efficiency. To address this objective, biomass accumulation and its physiological attributes of seven cultivars (including a commercial ...
Daniel F. Calderini, María F. Dreccer, Gustavo A. Slafer   +2 more
openaire   +1 more source

Associations between yield, intercepted radiation and radiation-use efficiency in chickpea

Crop & Pasture Science, 2017
Relationships between yield, biomass, radiation interception (PARint) and radiation-use efficiency (RUE) have been studied in many crops for use in growth analysis and modelling. Research in chickpea (Cicer arietinum L.) is limited, with variation caused by environment and phenological stage not adequately described. This study aims to characterise the
Lachlan Lake, Victor Sadras
openaire   +1 more source

A theoretical analysis of radiation interception in a two-species plant canopy

Mathematical Biosciences, 1991
Classical radiation interception laws for monospecific canopies cannot be used directly for bispecific canopies. They are always based on the gap frequency concept (i.e., the probability of no interception), which does not provide any information about the sharing of intercepted radiation between species. A theoretical analysis is reported that relates
Sinoquet, Herve, Bonhomme, Raymond
openaire   +3 more sources

Mapping interception of photosynthetically active radiation in sweet cherry orchards

Computers and Electronics in Agriculture, 2015
Canopy mapping on fractional photosynthetically active radiation (PAR) interception.Canopy projection distortion correction due to sun zenith and azimuth angle changes.Mobile PAR measurement system with a constant spatial resolution of 0.01msample-1.Canopy mapping and correction methods evaluation at dormant and full canopy stages.
Jingjin Zhang, Qin Zhang 0012, Matthew D. Whiting   +2 more
openaire   +1 more source

Intercepted flux and the horizontal component of solar radiation

Theoretical and Applied Climatology, 1995
For the first time a method is presented to actually measure the radiative flux intercepted by cylindrical and conical objects in radiation fields of any unknown angular distribution.
openaire   +1 more source

Relation of shape of canopy to interception of radiation and yield of wheat

The Journal of Agricultural Science, 1981
SUMMARYField experiments were made at the Punjab Agricultural University, Ludhiana, during 1974–5 to 1978–9 to study the possibility of improving wheat yield by more efficient use of radiant energy through modification of the shape of the canopy under varying levels of fertilizers, irrigation and seed rates.
G. S. Dhillon, D. S. Kler
openaire   +1 more source

Plasma Tubes Intercept Micorwave Radiation Independent of Polarization

2007 IEEE 34th International Conference on Plasma Science (ICOPS), 2007
Summary form only given. We have been designing a plasma shield intended to protect sensitive microwave equipment from intense electronic warfare signals. A layer of plasma tubes is used as a microwave reflector. The plasma tubes work extremely well in intercepting microwave radiation when the incident wave electric field is parallel to the tubes ...
Igor Alexeff, Ted Anderson, Esmaeil Farshi, Naresh Karnam, Eric Pius Pradeep, Nanditha Reddy Pulsani   +5 more
openaire   +1 more source

Joint effect of angular distribution of radiation and spatial pattern of trees on radiation interception

Ecological Modelling, 1998
Abstract A simulation study on the combined effects of sun angle and spatial pattern of trees on the amount of intercepted photosynthetically active radiation (PAR) is presented. Different spatial patterns of trees were generated starting from a square lattice.
Lappi, J., Stenberg, P.
openaire   +1 more source

Validity of the correlation between intercepted radiation and biomass

Agricultural and Forest Meteorology, 1994
Abstract Demetriades-Shah et al. (Agric. For. Meteorol., 1992, 58: 193–207) cast doubts on (a) the dependence of crop growth on incident solar radiation under ‘normal’ field conditions; (b) the validity of the relation between crop growth and intercepted radiation; (c) the need to measure interception as distinct from estimating plausible values.
openaire   +1 more source

Assessing the interception of photosynthetically active radiation in winter wheat

Agricultural Meteorology, 1983
Abstract Some current growth and yield models for wheat require methodology to estimate the daily quantity of photosynthetically active radiation (PAR) captured by the canopy. The interception of PAR was examined throughout the growing season in two varieties of winter wheat (Triticum aestivum L.) planted at three densities.
L.E. Hipps, G. Asrar, E.T. Kanemasu
openaire   +1 more source