Tomato (Solanum lycopersicum L.) is an important vegetable crop and often cultivated in regions exposed to salinity and high temperatures (HT) which change plant architecture, decrease canopy light interception and disturb physiological functions. However, the long-term effects of salinity and HT combination (S+HT) on plant growth are still unclear. A dynamic functional-structural plant model (...

To determine the influence of plant density and powdery mildew infection of winter wheat and to predict grain yield, hyperspectral canopy reflectance of winter wheat was measured for two plant densities at Feekes growth stage (GS) 10.5.3, 10.5.4, and 11.1 in the 2009-2010 and 2010-2011 seasons. Reflectance in near infrared (NIR) regions was significantly correlated with disease index at GS 10.5...

Experiments were conducted using model row crop canopies inside a model lean-to greenhouse (ratio 1 : 15) under artificial light to investigate the relations between row orientations and amount of direct solar radiation received by the canopy leaves. The model leaves were round in shape, horizontal in leaf inclination. The difference between the azimuthal directions of every two vertically neig...

Plant growth and biomass assessments are required in production and research. Such assessments are followed by major decisions (e.g., harvest timing) that channel resources and influence outcomes. In research, resources required to assess crop status affect other aspects of experimentation and, therefore, discovery. Destructive harvests are important because they influence treatment selection, ...

Estimating the spatial variability of various plant parameters during the growing season can assist in timely correction of stress conditions within a field. This research illustrates that the nitrogen reflectance index (NRI) developed to estimate plant nitrogen status can be used to estimate plant parameters and yield potential. The study was conducted on two experimental maize sites. Selected...

The growing of marijuana (Cannabis sativa L.) on pubon measured leaf spectra and simulated canopy refleclic lands poses problems to the environment and the pubtance spectra, we would choose several relatively narrow lic. Remote sensing offers a potential way of monitoring (i.e., 30 nm or less) spectral bands in the green (550 nm), public lands for the production of marijuana. However, red (670 ...

Background: Pergularia tomentosa L. has several traditional uses and biological activities which need to be more investigated. Objective: In this study, some ecological and phytochemical properties of Pergularia tomentosa were assessed. The flavonoids and cardenolides in the aqueous extract of leaves were identified with LCMS techniques. Methods: Some quantity characteristics of P. tomentosa...

Exclusion and not using of rangeland in the long term affects the composition and homogeneity of vegetation and consequently leads to the improvement of plants status. In this study, the characteristics and structural changes of the rangeland of Gonbad, Hamadan province, Iran, in 2014 (after 20 years of enclosure) were evaluated using Braun-Blanquet plot, Phytosociology and multivariate analysi...

Photoinhibition reduces photosynthetic productivity; however, it is difficult to quantify accurately in complex canopies partly because of a lack of high-resolution structural data on plant canopy architecture, which determines complex fluctuations of light in space and time. Here, we evaluate the effects of photoinhibition on long-term carbon gain (over 1 d) in three different wheat (Triticum ...

Vertical leaf nitrogen (N) gradient within a canopy is classically considered as a key adaptation to the local light environment that would tend to maximize canopy photosynthesis. We studied the vertical leaf N gradient with respect to the light gradient for wheat (Triticum aestivum) canopies with the aims of quantifying its modulation by crop N status and genetic variability and analyzing its ...