Job offersmore »
- Growing Manager - Skye, Victoria
- Assistant Professor of Urban Horticultural Crops - United States (CA)
- Senior Inkoper - Maasdijk, Nederland
- Product Manager Biostimulants - Westmaas, the Netherlands
- Corporate Grower - Camarillo (CA), USA
- General Manager China - Kunming, China
- Buyer greenhouse crops - Almeria, Spain
- Trucking Fleet Manager - Azerbaijan
- Fresh Produce Traders Required for a Leading Dutch/UK Fresh Produce Business
- Key Accountmanager Horticulture Glass
Top 5 - yesterday
- No news has been published yesterday.
Top 5 - last week
- Workers safe after carbon monoxide incident at Windset Farms
- Australia: New project to drive agriculture innovation in Victoria
- "With unemployment at record lows, labor is our biggest challenge"
- Hydropothecary announces expansion plans
- US (FL): Wish Farms launches strawberry season with new sweepstakes
Top 5 - last month
- US (TX): Tarrant County College board approves campus greenhouse
- Partial replacement of PAR light by far red light in tomato
- NL: New Geothermal Energy Alliance in South Holland
- German Agricultural Society and Fairtrade enter strategic partnership in Africa
- US (ME): Aquaponic grower secures $1.6M to expand greenhouse
Exchange ratesmore »
Increased electrical conductivity in nutrient solution benefits tomatoesGreenhouse tomato production is shifting to meet emerging consumer needs. Increasing environmental concerns have pressured growers to supply high-quality vegetables using sustainable production methods. The utilization of adapting fertigation to production conditions and/or nutrient solutions of moderately high conductivity seems promising in providing high yields of superior quality while limiting the emission of nutrients to the environment in greenhouse tomato crops.
In a new study, a tomato crop was grown in soilless culture with various levels of electrical conductivity (EC), 2.2, 3.5, and 4.5 dS·m−1, adjusting the final nutrient concentration and maintaining nutritional balance.
The effect of nutrient solutions with moderately high EC on fertigation parameters and the emission of nutrients to the environment, total crop productivity, distribution of fruit sizes, and dietary and organoleptic qualities were measured. Nutrient solutions of moderately high EC decreased total and commercial yield, with an average reduction from 5% to 19% and 3% to 22%, respectively. A considerable decrease in extra large and large fruits, with an average reduction from 69% to 42%, was also observed.
Nonetheless, dietary-related metabolites were significantly increased at the highest EC values: lycopene (6.3%), ascorbic acid (8.8%), total phenolics content (8.3%), and total antioxidant activity (11.1%). EC values of 3.5 and 4.5 dS·m−1 are not widely used in commercial production but are frequently measured in drainage solutions in open hydroponic systems and discarded solutions in closed systems, mainly because of the use of poor-quality water and the accumulation of excess nutrients.
Access the full study at HortScience.
Publication date: 8/9/2017
Other news in this sector: