Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Farming News .




FARM NEWS
Economics of high tunnels examined in southwestern United States
by Staff Writers
Las Cruces NM (SPX) May 07, 2014


The experiments, which were implemented over three growing seasons, were designed to measure differences between three passive solar high tunnel designs of different expense and heat retention capacities, and to evaluate growth and yield of spinach and lettuce planted at two different dates in each tunnel. The team conducted economic analyses in order to develop a risk model to determine relative probability of profitability of each tunnel design.

Used throughout the world in horticulture and agriculture production, high tunnels are less complex and less expensive versions of greenhouses. The structures' passive heating and cooling capabilities can offer growers a cost-effective way to extend the growing season for high-value crops such as fruits, vegetables, and cut flowers.

High tunnels can provide protection against some insects, early freezes, hail, and other weather events. A new study recommends the best high tunnel designs for growing lettuce and spinach during the winter season in the southwestern United States.

Using high tunnels can be an important advantage to local farmers, helping to extend growing seasons for fruits and vegetables as well as allowing them to offer locally grown products during off seasons. The authors of a new study published in HortTechnology say that extending the season with high tunnels has the added benefits of providing farmers with a more constant income flow and the ability to do better market planning.

Mark Uchanski and colleagues from New Mexico State University evaluated three models of high tunnels for winter production of spinach and lettuce. "Our (research) emphasis was on low-cost, practical structures that are applicable to farmers with limited resources and who may wish to test winter production before making larger investments in more advanced greenhouses," Uchanski said.

The experiments, which were implemented over three growing seasons, were designed to measure differences between three passive solar high tunnel designs of different expense and heat retention capacities, and to evaluate growth and yield of spinach and lettuce planted at two different dates in each tunnel. The team conducted economic analyses in order to develop a risk model to determine relative probability of profitability of each tunnel design.

Three high tunnel designs were used at two locations in New Mexico; designs included a single layer covering the house, a double layer inflated with air, and a double layer inflated with air and containing black water barrels to store heat. "The single-layer and double-layer designs appear to be the more appropriate technology for both locations for spinach, whereas the third model (double layer with water barrels) might be a reasonable option for lettuce in more-northern locations," Uchanski said.

"Overall, the single layer and double layer models provided adequate protection for growing crops, were less expensive to build, provided more interior growing space, and resulted in higher probabilities of producing positive returns compared with the double layer with water barrel design."

The authors noted that the double-layer design performed similarly to the single-layer design, but required running electricity to the structure to power the inflation fan, which added to the cost. As a result, expected returns in all cases were higher using the single-layer design, based on the results of the sensitivity analyses.

"This study combining the risk and the sensitivity analyses provides growers with a unique evaluation process to make high tunnel design, planting date, and crop choices," the authors said.

The complete study and abstract are available here

.


Related Links
American Society for Horticultural Science
Farming Today - Suppliers and Technology






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





FARM NEWS
Food security increased by new scientific model in agricultural production
Washington DC (SPX) May 07, 2014
Farmers are used to optimizing crop production on their own lands. They do soil tests to choose the right amount of fertilizers to apply, and they sometimes plant row crops on some fields while keeping others in pasture. But is it possible to optimize production across a much bigger area-say, the whole East Coast of the United States? That's the question a team of USDA-ARS scientists in Be ... read more


FARM NEWS
EO May Increase Survival Of 'Uncontacted' Tribes

Satellite Movie Shows US Tornado Outbreak from Space

UV-radiation data to help ecological research

NASA Goddard to Bring Satellite Data to African Agriculture

FARM NEWS
Glonass Failure Caused by Faulty Software

Homegrown high-precision positioning system put to use

Russia eyes building Glonass stations in 36 countries

Turn your satnav ideas into business

FARM NEWS
Leaf chewing links insect diversity in modern and ancient forests

Amazon rainforest survey could improve carbon offset schemes

Untangling Brazil's controversial new forest code

Genetic legacy of rare dwarf trees is widespread

FARM NEWS
Ozone levels drop 20 percent with switch from ethanol to gasoline

Study casts doubt on climate benefit of biofuels from corn residue

Rethink education to fuel bioeconomy

Going nuts? Turkey looks to pistachios to heat new eco-city

FARM NEWS
National Bank of Canada backing Ontario solar facilities

Taking the lead out of a promising solar cell

21.2% World Record Efficiency PERC Silicon Solar Cell Using Heraeus Ag Metallization Pastes

Tin helps scientists build new cheaper solar cells

FARM NEWS
LDD completes relief drilling campaign for UK offshore wind farm

Benefits from a low-carbon economy are clear, Scotland says

E.ON anchors transformer to offshore wind farm

New Software Service Promises to Convert More Wind Into Power

FARM NEWS
China coal mine death toll rises to 20: report

Rescuers race to save 22 trapped coal miners in China: Xinhua

U.K. Coal may close two deep mines

Your money or your life: coal miner's dilemma mirrors China's

FARM NEWS
China lawyer held ahead of Tiananmen anniversary: associate

Migration steals the magic from China's mountain shamans

Church demolition illuminates China's religious tensions

US lawmaker urges China to expand religious freedoms




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.