Daily and seasonal net photosynthesis (Anet), transpiration (E), absorbed photosynthetically active radiation (Qa) and light-use efficiency (epsilonc) in a red maple container nursery were simulated with MAESTRA, a three-dimensional canopy model. Effects of canopy heterogeneity were simulated by imposing changes in crown spacing. The light transfer sub-model, a distribution model of incident, d...

We quantified the photosynthetically active radiation (PAR) interception in a high-density (HD) and super (SHD) or hedgerow olive system, by measuring PAR transmitted under canopy along transects at increasing distance from tree rows. Transmitted was measured every minute, then cumulated over day season. The frequencies of different levels occurring during were calculated. SHD intercepted signi...

Continuous and accurate ground measurements of the fraction absorbed (fAPAR) or intercepted (fIPAR) photosynthetically active radiation by green canopy components is important to monitor functioning. fAPAR fIPAR are sensitive illumination conditions non-green during senescence stage. While several methods have been developed estimate in field from different including AccuPAR, LAI-2200 Digital H...

ture and needle morphology on the distributions of light and nitrogen within a Pacific silver fir (Abies amabilis (Dougl.) Forbes) canopy. Specifically, we investigated the role of morphological shade acclimation in the determination of resource use efficiency, which is claimed to be optimal when the distribution of nitrogen within the canopy is directly proportional to the distribution of inte...

We studied the effects of variation in shoot structure and needle morphology on the distributions of light and nitrogen within a Pacific silver fir (Abies amabilis (Dougl.) Forbes) canopy. Specifically, we investigated the role of morphological shade acclimation in the determination of resource use efficiency, which is claimed to be optimal when the distribution of nitrogen within the canopy is...

A new dosimetric package for assessing solar radiation affecting photosynthesis in the visible and ultraviolet wavebands in plant canopies has been developed and tested. The package consists of several detectors sensitive to various wavebands between 290 and 700 nm. For photosynthetically active radiation (PAR), the dosimeter was calibrated for exposures in terms of photosynthetically active ph...

The efficiency of a crop to intercept and utilize solar radiation for photosynthates production serves as one the deciding factors productive potential stand. Interception use photosynthetically active (PAR) were estimated in relay grass pea under different nutrient management schedules consecutive two seasons 2017–2018 2018–2019. Treatments levels seed priming (i.e., 1. S1: Without 2. S2: Seed...

Maize–soybean intercropping systems are widely used in developing countries, but few studies have been performed to optimize such systems. The effects of strip width and orientation on photosynthetically active radiation (PAR) distribution characteristics were therefore determined gain a better understanding crop productivity maize–soybean A series experiments incorporating different orientatio...