Quantifying the effects of far-red light on lettuce photosynthesis and growth using a 3D modelling approach.

In vertical farms, the supplementation of far-red light has been widely applied to regulate plant growth and development. However, the relative contribution of far-red to photosynthesis and plant growth in indoor production systems is not sufficiently quantified. This study quantify the photosynthesis and growth responses under different levels of supplemental far-red in lettuce using a 3D modelling approach.

Biochemical versus stomatal acclimation of dynamic photosynthetic gas exchange to elevated CO in three horticultural species with contrasting stomatal morphology.

Understanding photosynthetic acclimation to elevated CO (eCO) is important for predicting plant physiology and optimizing management decisions under global climate change, but is underexplored in important horticultural crops. We grew three crops differing in stomatal density-namely chrysanthemum, tomato, and cucumber-at near-ambient CO (450 μmol mol) and eCO (900 μmol mol) for 6 weeks. Steady-state and dynamic photosynthetic and stomatal conductance (g) responses were quantified by gas exchange measurements.

Green light is similarly effective in promoting plant biomass as red/blue light: a meta-analysis.

Whether green light promotes or represses plant growth is an unresolved but important question, warranting a global meta-analysis of published data. We collected 136 datasets from 48 publications on 17 crop species, and calculated the green light effect for a range of plant traits. For each trait the effect was calculated as the ratio between the trait value attained under a red/blue background light plus green, divided by the value attained under the background light only, both having the same light intensity.

Doping tuned spin reorientation and spin switching in praseodymium-samarium orthoferrite single crystals.

We investigate the detailed analysis of the magnetic properties in a series of PrSmFeOsingle crystals from= 0 to 1 with an interval of 0.1. Doping controlled spin reorientation transition temperatureΓ(,,) to Γ(,,) covers a wide temperature range including room temperature.

Treatment of chemical cleaning wastewater and cost optimization by response surface methodology coupled nonlinear programming.

The real alkaline cleaning wastewater (ACW) was treated by a process consisting of neutralization, NaClO oxidation and aluminum sulfate (AS) coagulation, and a novel response surface methodology coupled nonlinear programming (RSM-NLP) approach was developed and used to optimize the oxidation-coagulation process under constraints of relevant discharge standards. Sulfuric acid neutralization effectively removed chemical oxygen demand (COD), surfactant alkylphenol ethoxylates (OP-10) and silicate at the optimum pH of 7.0, with efficiencies of 62.