seed and oil yields, its components and two physiological indices including leaf canopy temperature (tc) and relative water content (rwc) were evaluated in two spring oilseed rape cultivars (rgs 300 and hyola 401) under non-stressed and water deficit imposed during stem elongation, flowering and seed filing stages. the experiments were conducted as a factorial consisted of 2 factors including i...

Plant photosynthesis and biomass production are associated with the amount of intercepted light, especially light distribution inside canopy. Three virtual canopies (n = 80, 3.25 plants/m2) were constructed based on average leaf size digitized plant structures: ‘small leaf’ (98.1 cm2), ‘medium (163.0 cm2) ‘big (241.6 cm2). The ratios diffuse set in three gradients (27.8%, 48.7%, 89.6%). simulat...

The role of mannitol and malic acid in the regulation of diurnal leaf water relations was investigated in 'Biancolilla' (high-mannitol) and 'Cerasuola' (low-mannitol) olive trees. Photosynthetic photon flux density (PPFD), vapor pressure deficit (VPD), stomatal conductance (gs), transpiration rate (T), relative water content (RWC), mannitol and malic acid were measured in 'Biancolilla' and 'Cer...

Cowpea (Vigna unguiculata (L.) Walp.) is a leguminous species widely cultivated in northern and northeastern Brazil. In the state of Pará, this crop still has low productivity due to several factors, such as soil fertility climatic adversity, especially water deficiency. Therefore, present study aimed at evaluating physiological parameters cowpea plants under different depths. The experiment wa...

The amount of photosynthetically active radiation (PAR) absorbed by a canopy (APAR) is an important driving variable for vegetation processes such as photosynthesis. PAR extinction in clumped canopies of shortgrass ecosystems is the focus of this paper. Directional gap fractions estimated at peak biomass on several Mexican shortgrass ecosystems with a hemispherical radiation sensor (Li-Cor, LAI...

Canopy structural parameters and light radiation are important for evaluating the light use efficiency and grain yield of crops. Their spatial variation within canopies and temporal variation over growth stages could be simulated using dynamic models with strong application and predictability. Based on an optimized canopy structure vertical distribution model and the Beer-Lambert law combined w...

Groundwater is the main water resource for plant growth and development in the saline soil of the Yellow River Delta in China. To investigate the variabilities and distributions of soil water and salt contents at various groundwater level (GL), soil columns with planting Tamarix chinensis Lour were established at six different GL. The results demonstrated the following: With increasing GL, the ...

A field experiment was conducted over 2 years to evaluate the gas exchange, water relations and water use efficiency (WUE) of wheat under different water stress and nitrogen management practices at Crop Physiology Research Area, University of Agriculture, Faisalabad. Pakistan. Four irrigation levels, i.e. one irrigation (Irrigation at tillering stage), two irrigations (Irrigations at tillering ...

This study aimed at evaluating the effects of culture media and environmental factors (temperature water potential (Ψw)) on growth pathogenic fungus Phytopythium vexans (de Bary) associated with root rot dieback disease in apple trees. Tomato agar, potato dextrose agar (PDA), soybean were most favourable for rapid mycelial growth, optimum recorded PDA medium. To determine conditions that promot...