Navigation Links
Plant growth rate, stem length unaffected by rice hull, peat substrate

WEST LAFAYETTE, INPlant growth retardants, or PGRs, are used in greenhouse operations to produce uniform, compact, and marketable plants. Although PGRs can be applied using a variety of methods, most common applications are foliar sprays or substrate "drenches". Research has shown that drenches provide more uniform results and increase the duration of effectiveness compared with sprays, but the efficacy of drenches can be affected by factors such as the amount of solution applied and the substrate components used.

Organic components such as parboiled rice hulls are becoming more common in soilless growing substrates. While some organic substrate components, such as bark, have been shown to reduce the efficacy of PGR drenches, the influence of rice hulls had not been determined until recently. Purdue University scientists Christopher Currey, Diane Camberato, Ariana Torres, and Roberto Lopez published a research report in HortTechnology that identified the impact of a substrate containing rice hulls on PGR applications for controlling plant height or stem length of containerized greenhouse crops.

For the experiments, 'Callie Deep Yellow' calibrachoa and 'Delta Orange Blotch' pansy were planted in containers filled with a substrate containing 80% peat and 20% perlite or 80% peat and 20% parboiled rice hulls. After planting, 2.5-fl oz drenches containing deionized water or ancymidol, paclobutrazol, or uniconazole were applied to plants grown in each substrate.

Results showed that plant growth retardants, but not substrate, affected growth rate and final stem length of calibrachoa. Similar to calibrachoa, the rate of growth and plant height of pansy 6 weeks after applications was affected by PGR, but not substrate.

"There was no significant difference in final plant height or stem length of pansy or calibrachoa, respectively, between plants grown in standard or rice hull substrate when given identical PGR applications. Based on these results, rice hulls did not reduce PGR drench efficacy when included as a substrate component comprising 20% of a substrate", noted corresponding author Lopez.

"Our research shows that producers may employ PGR drench strategies that have previously been used for plants grown in substrate comprised of peat and perlite for plants grown in substrate containing peat and rice hulls at the proportions used in this study", concluded Lopez.


Contact: Michael W. Neff
American Society for Horticultural Science

Related biology news :

1. Plant pathologist finding Kansas wheat fields a molecular battleground this season
2. 2 UC Davis plant biologists named as HHMI-GBMF investigators
3. Not just another brick in the (plant cell) wall
4. Plants teach humans a thing or two about fighting diseases
5. The sweet growth of plant cells
6. MSU plant scientist named one of the nations most innovative researchers
7. Caltech scientist awarded $5 million grant for plant research
8. What makes a plant a plant?
9. Study reveals important aspects of signaling across cell membranes in plants
10. Healing times for dental implants could be cut
11. Global strategy for plant conservation conference to take place at the Missouri Botanical Garden
Post Your Comments:
(Date:4/11/2017)... N.Y. , April 11, 2017 ... fingerprints, but researchers at the New York University ... College of Engineering have found that partial similarities ... security systems used in mobile phones and other ... thought. The vulnerability lies in the ...
(Date:4/5/2017)... Allen Institute for Cell Science today announces the launch ... dynamic digital window into the human cell. The website ... deep learning to create predictive models of cell organization, ... suite of powerful tools. The Allen Cell Explorer will ... resources created and shared by the Allen Institute for ...
(Date:4/4/2017)... YORK , April 4, 2017   EyeLock ... today announced that the United States Patent and Trademark ... patent broadly covers the linking of an iris image ... same transaction) and represents the company,s 45 th ... latest patent is very timely given the multi-modal biometric ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... ... implantation and pregnancy rates in frozen and fresh in vitro fertilization (IVF) ... and maternal age to IVF success. , After comparing the results from the ...
(Date:10/10/2017)... ... ... Dr. Bob Harman, founder and CEO of VetStem Biopharma, Inc. spent ... entitled “Stem Cells and Their Regenerative Powers,” was held on August 31st, 2017 ... joined by two human doctors: Peter B. Hanson, M.D., Chief of Orthopedic Surgery, Grossmont ...
(Date:10/9/2017)... Oct. 9, 2017  BioTech Holdings announced today ... which its ProCell stem cell therapy prevents limb ... The Company, demonstrated that treatment with ProCell resulted ... saved as compared to standard bone marrow stem ... resulted in reduction of therapeutic effect.  ...
(Date:10/7/2017)... ... October 06, 2017 , ... ... applications consulting for microscopy and surface analysis, Nanoscience Instruments is now expanding ... offers a broad range of contract analysis services for advanced applications. Services ...
Breaking Biology Technology: