In poinsettias grown using these deficit irrigation methods, leaf and bract drop were reduced by 50% and 90% respectively, compared to well-watered plants.
Deficit irrigation is a technique that replaces only a percentage of the water that the plant loses. This stimulates the plant to produce hormones that can influence plant ‘robustness’ and improve tolerance to the stresses encountered during distribution and retailing. This technique not only reduces water use, but also reliance on plant growth regulators (PGRs) used in normal commercial production. These are labour intensive to apply and are reported to pose risks to the environment.
The work follows on from experiments conducted last season, in which Regulated Deficit Irrigation (RDI) was used on a commercial scale for the first time using a flood-and-drain system at Staplehurst Nurseries. A six-week RDI regime used during the period of rapid growth successfully reduced stem extension so that plant heights were well within specifications at simulated market date. RDI-treated plants received only 1 PGR spray shortly after ‘pinching’, compared to the 9 or 10 sprays needed to control height in the conventionally-irrigated plants.
Research leader Dr Mark Else says “Our research at Staplehurst Nurseries has shown that growers could use RDI to produce poinsettias with excellent shape and colour, as an alternative to intensive PGR spray programmes. In addition to saving water, other benefits include an improved shelf- and home-life thereby reducing wastage and reduced environmental pollution”.
Plasma-zapping process could yield trans fat-free soybean oil product
02.12.2016 | Purdue University
New findings about the deformed wing virus, a major factor in honey bee colony mortality
11.11.2016 | Veterinärmedizinische Universität Wien
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
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07.12.2016 | Health and Medicine
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07.12.2016 | Health and Medicine