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The correct supply of water and nutrients is important in hydroponic growing systems in order to use water efﬁciently, avoid stress situations, and control production. The present study was conducted to evaluate two irrigation scheduling techniques for hydroponic tomato production in Navarra, northern Spain, related to the crop water requirements. The results show that although daily over-irrigation was applied (45.7% of drainage), 18% of the total yield (35 kg m−2 ) was affected by blossom-end rot problems, due to water stress suffered by the crop. Irrigation scheduling by time clock was not ﬂexible enough to satisfy the varying crop water requirements through the day and during the season. With constant irrigation intervals and volumes, water and fertilisers were wasted during the morning (excessive irrigation) whereas during the afternoon, the plants suffered water stress. Irrigation scheduling by radiation method at a level of 0.81 MJ m−2 , with some supplementary time clock irrigation applications during the hours of darkness (in order to keep the growing medium wet), appeared to be a good solution. Copyright 2003 John Wiley & Sons, Ltd.
greenhouse vegetables Hydroponic Tomatoes Maximizing yields from hydroponic tomato crops has long been the main objective of commercial growers. However, there’s growing consumer pressure to produce high-quality, great-tasting fruit that stores and handles well in the retail sector. By Lynette Morgan T Top: Properly grown hydroponic tomatoes are often ﬁt to be framed; Bottom: This single-truss crop is being grown on greenhouse benches in NFT. (Photos courtesy of Lynette Morgan) Hydroponic Resource Are you looking to grow more greenhouse vegetables or growing hydroponically? GPN will bring you a few articles a year, but if you want in-depth information year-round, research such as this can be found in The Growing Edge magazine. It is a great resource for hydroponic growers. Visit www.growingedge.com or call (800) 888-6785 for subscription and other information. 78 GPN October 2003 omatoes, the biggest hydroponically produced crop on a worldwide scale, are complex in their physiology and response to crop management techniques since vegetative growth, ﬂowering and fruiting all need to be continually maintained simultaneously on the plant. Obtaining economic yields of highquality fruit while minimizing the use of pesticides and other agrichemicals has put commercial tomato growers under increasing pressure, and many are now looking to modiﬁed hydroponic systems where higher proﬁts are possible. Many of these new tomato-growing techniques involve the production of “spray-free” crops and using organically based systems. Today’s selection includes a wide range of new, fresh tomato products, such as lowacid fruit; on-the-truss, cluster or vine-ripened fruit; and many new....
The Strategic Marketing Institute Working Paper The Market for Greenhouse-Grown Tomatoes Getachew Abate June 2006 P RODUCT C ENTER For Agriculture and Natural Resources Room 80 Agriculture Hall, Michigan State University, East Lansing, MI 48824 (517) 432-4608 Envisioning, exploring and empowering a profitable future for businesses and industries engaged in Michigan’s agricultural, food and natural resource systems. 1 Market Overview Greenhouse tomatoes include both soil-grown and hydroponic tomatoes. The U.S., Canada and Mexico are major producers of greenhouse tomatoes in North America. In 2003, total greenhouse production in the three countries has been estimated at 528,078 metric tons (Table 1). Canada accounted for about 42% of the total production, while the U.S. and Mexico accounted for 30% and 28% respectively. Mexico is leading in field tomato production, while Canada has the lowest field tomato production. Table 1: North America greenhouse and field tomato production (2003)* United States...
AEG/Electrolux standardizes on Zytel HTN for oven fans and frames ® AEG/Electrolux has standardized on glass-reinforced Zytel®HTN for the high-speed fans and inner glass door support frames in its new Competence range of electric ovens. By Hubert Mueller, DuPont Engineering Polymers, Germany Switching to glass-reinforced Zytel® HTN high performance polyamide from metal means that AEG/Electrolux can standardize the fans and support frames used across its new range of Competence electric ovens. "By moulding these components in Zytel® HTN , we have reduced the overall number of parts used, improved production efficiency and implemented substantial cost savings," said the design director for Electrolux’s Competence range, Horst Meister, who is based at Electrolux’s Central European Oven Development Centre in Rothenburg ob der Tauber (Germany). AEG/Electrolux requires high temperature dimensional stability for the fans, which need to run reliably at continuous temperatures of up to 260 degrees C – necessary when the oven is being automatically cleaned by pyrolysis at up to 500 degrees C. The fans of glass reinforced Zytel® HTN meet this specification with ease. As an added plus, the new high-speed fans also cool down oven door exteriors better than the previous, metal fans. Even after a full hour of hot air operation, the outside surface of the oven doors reach an average of only 40 degrees C, whereas the doors reached up to 80 degrees C when they were cooled by metal fans. The complex design of AEG/ Electrolux’s Competence oven fans means that the mould tool is unusually large; it is about the size of an office desk. This is because seven solid cores were required for the...
WESTERN PRODUCTS, P.O. BOX 245038, MILWAUKEE, WI 53224-9538 Lit. No. 64127 October 31, 2003 CHEVY/GMC 1500/2500/3500 4x4 1999 & LATER VEHICLE SPECIFIC ELECTRICAL INSTALLATION INSTRUCTIONS Model No. 3515 & 3525 and Model No. 3519 & 3529 Straight Blade (Models 3515, 3525, 3519, & 3529) 2003 & Later: Harness Kit No. 64077 (HB-3 & HB-4 QUAD Lights) Headlamp Kit 12-Pin (White) No. 64078 1999-2002: Harness Kit No. 63392 (HB-3 & HB-4 QUAD Lights) Headlamp Kit 9-Pin No. 61540-1 MVP® Blade (Models 3525 & 3529) 2003 & Later: Harness Kit No. 64085 (HB-3 & HB-4 QUAD Lights) Headlamp Kit 12-Pin (White) No. 64078 1999-2002: Plug-In Harness 63394 (HB-3 & HB-4 QUAD Lights) Headlamp Kit 66640-1 MVP 12-Pin CAUTION Read this document before installing the snowplow. CAUTION See your WESTERN outlet for application recommendations. The Selection List has specific vehicle and snowplow requirements. ®
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