Research shows importance of ample nitrogen fertilization at all growth stages
The Phalaenopsis orchid, also known as the moth orchid, is the most important pot flower in terms of market value in the world's major floriculture markets. Because nitrogen significantly affects the growth and flowering of Phalaenopsis, nitrogen needs during flowering are of particular interest to growers.
Researchers Hadi Susilo, Ying-Chun Peng, and Yao-Chien Alex Chang from the Department of Horticulture and Landscape Architecture at National Taiwan University published a study in the Journal of the American Society for Horticultural Science that determined the importance of providing Phalaenopsis with ample nitrogen fertilization at the its various growth stages.
"To our knowledge, the relative contributions of stored nitrogen (N) and recently absorbed fertilizer N to the developing inflorescence had not been studied in Phalaenopsis," the authors said. "The relative contributions to the stored N pool of N accumulated during the different growth stages during the long vegetative period of Phalaenopsis cultivation were also unknown. The objective of our study was to bring answers to these unknowns."
The team used N-labeling--a powerful research tool for accurately determining the fate of nitrogen in the environment--to compare the contributions of fertilizer N, applied before or after spiking, to the developing inflorescence, and compared the relative contributions of fertilizer N absorbed during various stages of the vegetative period to the stored N pool.
"The nutritional study of Phalaenopsis is difficult with traditional methods because it has a strong buffering capacity against nutrient deficiency, but we used 15N-labeling with the enrichment method to accurately trace the absorption and partitioning of fertilizer N in Phalaenopsis," the scientists said.
The results of multiple experiments showed that inflorescence is a major N sink during the reproductive stage of Phalaenopsis. "Fertilizer applied during the reproductive stage is a significant N source for the inflorescence development of Phalaenopsis, whereby current fertilizer application supplies 57% of the N required for inflorescence development. Therefore, providing sufficient fertilizer N is important during the reproductive stage to ensure the quality of flowering," the authors said.
Further experiments showed that, even when ample fertilization was provided during the reproductive stage, 6-8% of the nitrogen accumulated during growing Stage I (small plant in 4.5-cm pot for 5 months), Stage II (medium plant in 8.5-cm pot for 5 months), and Stage III (large plant in 10.5-cm pot for 5 months) ended up in the inflorescence at the visible bud stage.
At the "two-third flowers open" stage, 12-16% of the N accumulated in the plant during these three stages ended up in the inflorescence. The scientists concluded that these results indicated the importance of providing Phalaenopsis with ample N fertilization at all growth stages.
The complete study and abstract are available on the ASHS J. Amer. Soc. Hort. Sci. electronic journal web site: http://journal.ashspublications.org/content/139/1/69.abstract
Founded in 1903, the American Society for Horticultural Science (ASHS) is the largest organization dedicated to advancing all facets of horticultural research, education, and application. More information at ashs.org
Michael W. Neff | EurekAlert!
Farming with forests
23.09.2016 | University of Illinois College of Agricultural, Consumer and Environmental Sciences (ACES)
Ecological intensification of agriculture
09.09.2016 | Julius-Maximilians-Universität Würzburg
Heavy construction machinery is the focus of Oak Ridge National Laboratory’s latest advance in additive manufacturing research. With industry partners and university students, ORNL researchers are designing and producing the world’s first 3D printed excavator, a prototype that will leverage large-scale AM technologies and explore the feasibility of printing with metal alloys.
Increasing the size and speed of metal-based 3D printing techniques, using low-cost alloys like steel and aluminum, could create new industrial applications...
Friction stir welding is a still-young and thus often unfamiliar pressure welding process for joining flat components and semi-finished components made of light metals.
Scientists at the University of Stuttgart have now developed two new process variants that will considerably expand the areas of application for friction stir welding.
Technologie-Lizenz-Büro (TLB) GmbH supports the University of Stuttgart in patenting and marketing its innovations.
Friction stir welding is a still-young and thus often unfamiliar pressure welding process for joining flat components and semi-finished components made of...
Optical quantum computers can revolutionize computer technology. A team of researchers led by scientists from Münster University and KIT now succeeded in putting a quantum optical experimental set-up onto a chip. In doing so, they have met one of the requirements for making it possible to use photonic circuits for optical quantum computers.
Optical quantum computers are what people are pinning their hopes on for tomorrow’s computer technology – whether for tap-proof data encryption, ultrafast...
The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP has been developing various applications for OLED microdisplays based on organic semiconductors. By integrating the capabilities of an image sensor directly into the microdisplay, eye movements can be recorded by the smart glasses and utilized for guidance and control functions, as one example. The new design will be debuted at Augmented World Expo Europe (AWE) in Berlin at Booth B25, October 18th – 19th.
“Augmented-reality” and “wearables” have become terms we encounter almost daily. Both can make daily life a little simpler and provide valuable assistance for...
With the help of artificial intelligence, chemists from the University of Basel in Switzerland have computed the characteristics of about two million crystals made up of four chemical elements. The researchers were able to identify 90 previously unknown thermodynamically stable crystals that can be regarded as new materials. They report on their findings in the scientific journal Physical Review Letters.
Elpasolite is a glassy, transparent, shiny and soft mineral with a cubic crystal structure. First discovered in El Paso County (Colorado, USA), it can also be...
30.09.2016 | Event News
29.09.2016 | Event News
28.09.2016 | Event News
30.09.2016 | Materials Sciences
30.09.2016 | Earth Sciences
30.09.2016 | Life Sciences