Navigation Links
Recycling perlite: New, improved method saves resources
Date:3/17/2011

BOSSIER CITY, LAPerlite, a processed volcanic mineral, is widely used as a component of soilless growing mixes. Lightweight, sterile, and easy to use, perlite is popular with greenhouse growers. But because salt and pathogen buildup can occur when perlite is reused, it must be replaced every year or two to minimize the risk of crop failure. The cost of disposing of old material and replacing it with new perlite can be significant and often prohibitive for smaller greenhouse operations. Hanna Y. Hanna, a researcher at Louisiana State University Agricultural Center's Red River Research Station, has developed a new method for recycling perlite that can save tomato growers a significant amount of money without reducing crop yield.

Hanna, who has done extensive previous research on perlite, says that using the same perlite to grow successive crops like tomatoes can be risky; it tends to compact and is subject to salt build-up and pest contamination. "Steam sterilization of used perlite before planting a new crop is recommended to safeguard against pathogen contamination, but this treatment requires the use of expensive steam generators and is not efficient in desalinating the medium", Hanna said.

In a recent issue of HortTechnology, Hanna reported on a new method developed to accelerate the recycling of perlite. The experiments were conducted in a greenhouse over three growing seasons to evaluate three different methods for perlite recycling and their effects on cost, desalination efficiency, and tomato yield.

Three recycling methods"no stir/sift-then-disinfect", "stir-then-disinfect", and "sift-then-disinfect"were put to the test for Hanna's experiments. Each recycling method consisted of two components: the reconditioning action and the hot water treatment. During the experiments, perlite recycled with the no stir/sift-then-disinfect method was not reconditioned before the hot water treatment. Instead, it was agitated with a nozzle mounted on a pressure washer wand during the hot water treatment. Perlite recycled with the stir-then-disinfect method was reconditioned first with an auger mounted on an electric drill, then treated with hot water. Perlite recycled with the sift-then-disinfect method was reconditioned first by sifting the perlite with a homemade apparatus, then treated with hot water.

"The results revealed that recycling perlite with the no stir/sift-then-disinfect method reduced labor input by 49% and 81% compared with the stir-then-disinfect and the sift-then-disinfect methods, respectively. The no stir/sift-then-disinfect method reduced recycling cost by 22% and 50% compared with the other two methods, respectively", Hanna noted. Tomatoes grown in perlite recycled with any of the three methods produced similar marketable and cull yields and fruit weight.

The results showed that the no stir/sift-then-disinfect method is less time-consuming, more economical, and has no negative impact on yield. The new method gives greenhouse tomato growers more cost-effective options for recycling perlite while saving valuable natural resources.

"The cost of renting of a hot water pressure washer and a few miscellaneous items can be the only out-of-pocket expense for using this method. Additionally, the method eliminates labor time and effort to remove old medium from the greenhouse, transport it to a land fill or a vacant field for disposal, and fill other bags with new perlite", Hanna concluded.


'/>"/>

Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

Related biology news :

1. TECNALIA uses artificial vision to improve recycling of electronic scrap metal
2. Researchers identify a new gene involved in autophagy, the cellular recycling program
3. Opening the gate to the cells recycling center
4. Scientists concerned about environmental impact of recycling of e-waste
5. Your body recycling itself -- captured on film
6. Industry honors plastics recycling and reactive polymer processing expert at NJIT
7. Carnegie Mellon researchers discover mechanism for signaling receptor recycling
8. Spanish cities fail to meet legal requirements on paper and container recycling
9. Molecule that spurs cells recycling center may help Alzheimers patients
10. Scientists identify gene that may contribute to improved rice yield
11. NIST guides genetic genealogy labs toward improved accuracy
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Recycling perlite: New, improved method saves resources
(Date:4/13/2017)... According to a new market research report "Consumer IAM Market by ... Service, Authentication Type, Deployment Mode, Vertical, and Region - Global Forecast to ... USD 14.30 Billion in 2017 to USD 31.75 Billion by 2022, at ... ... MarketsandMarkets Logo ...
(Date:4/11/2017)... Research and Markets has announced the addition ... their offering. ... tracking market to grow at a CAGR of 30.37% during the ... 2017-2021, has been prepared based on an in-depth market analysis with ... its growth prospects over the coming years. The report also includes ...
(Date:4/11/2017)... NXT-ID, Inc. (NASDAQ:   NXTD ) ("NXT-ID" or ... independent Directors Mr. Robin D. Richards and Mr. ... the company,s corporate governance and expertise. ... Gino Pereira , Chief Executive Officer said," ... and benefiting from their considerable expertise as we move forward ...
Breaking Biology News(10 mins):
(Date:4/27/2017)... and RESEARCH TRIANGLE PARK, N.C. ... (NASDAQ: UTHR ) today announced that its ... $250 million of the company,s common stock. This program ... December 31, 2017. Purchases may be made in the ... transactions from time to time as determined by United ...
(Date:4/27/2017)... ... April 27, 2017 , ... Mitotech S.A, a Luxembourg ... Hereditary Optic Neuropathy (LHON) patients. LHON is a rare devastating genetic disease that leads ... eye drops in a group of 20 patients carrying 11778, 14484 and 3460 mutations ...
(Date:4/27/2017)... Linda, Ca (PRWEB) , ... April 27, 2017 ... ... hear from a practicing internist, who will review how testing for 1,25-Dihydroxyvitamin D ... that prompt ordering of 25-OH-vitamin D and 1,25 dihydroxyvitamin D. , Dr. Gregory ...
(Date:4/27/2017)... ... April 27, 2017 , ... Volunteers supported by ... researchers, engineers, and industry professionals in visiting U.S. Congressional offices in Washington, D.C., ... the world photonics industry. , This year, National Photonics Initiative (NPI) ...
Breaking Biology Technology: