scholarly journals Exposure to Pesticides in Tomato Crop Farmers in Merced, Colombia: Effects on Health and the Environment

10.5772/48640 ◽  
2012 ◽  
Author(s):  
Marcela Varona ◽  
Sonia Mireya ◽  
Andrs Monroy ◽  
Edwin Barbosa ◽  
Martha Isabel ◽  
...  
Keyword(s):  
Tomato Crop

scholarly journals Semi-Transparent Organic Photovoltaics Applied as Greenhouse Shade for Spring and Summer Tomato Production in Arid Climate

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1152
Author(s):  
Rebekah Waller ◽  
Murat Kacira ◽  
Esther Magadley ◽  
Meir Teitel ◽  
Ibrahim Yehia
Keyword(s):  
Solar Radiation ◽  
Organic Photovoltaics ◽  
Crop Production ◽  
Production Systems ◽  
High Light ◽  
Growth And Yield ◽  
Control Group ◽  
Tomato Crop ◽  
Tomato Production ◽  
Control Section

Recognizing the growing interest in the application of organic photovoltaics (OPVs) with greenhouse crop production systems, in this study we used flexible, roll-to-roll printed, semi-transparent OPV arrays as a roof shade for a greenhouse hydroponic tomato production system during a spring and summer production season in the arid southwestern U.S. The wavelength-selective OPV arrays were installed in a contiguous area on a section of the greenhouse roof, decreasing the transmittance of all solar radiation wavelengths and photosynthetically active radiation (PAR) wavelengths (400–700 nm) to the OPV-shaded area by approximately 40% and 37%, respectively. Microclimate conditions and tomato crop growth and yield parameters were measured in both the OPV-shaded (‘OPV’) and non-OPV-shaded (‘Control’) sections of the greenhouse. The OPV shade stabilized the canopy temperature during midday periods with the highest solar radiation intensities, performing the function of a conventional shading method. Although delayed fruit development and ripening in the OPV section resulted in lower total yields compared to the Control section (24.6 kg m−2 and 27.7 kg m−2, respectively), after the fourth (of 10 total) harvests, the average weekly yield, fruit number, and fruit mass were not significantly different between the treatment (OPV-shaded) and control group. Light use efficiency (LUE), defined as the ratio of total fruit yield to accumulated PAR received by the plant canopy, was nearly twice as high as the Control section, with 21.4 g of fruit per mole of PAR for plants in the OPV-covered section compared to 10.1 g in the Control section. Overall, this study demonstrated that the use of semi-transparent OPVs as a seasonal shade element for greenhouse production in a high-light region is feasible. However, a higher transmission of PAR and greater OPV device efficiency and durability could make OPV shades more economically viable, providing a desirable solution for co-located greenhouse crop production and renewable energy generation in hot and high-light intensity regions.

Effect of Particle Size and Reused Organic Substrates on Tomato Crop Production

2015 ◽  
Vol 38 (12) ◽  
pp. 1877-1884
Author(s):  
Alberto Gabino Martínez-Gutiérrez ◽  
Angélica Bautista Cruz ◽  
Cirenio Escamirosa Tinoco ◽  
Juana Yolanda López Cruz ◽  
Miguel Urrestarazu
Keyword(s):  
Particle Size ◽  
Crop Production ◽  
Organic Substrates ◽  
Tomato Crop ◽  
Effect Of Particle Size

scholarly journals The 2009 Late Blight Pandemic in the Eastern United States – Causes and Results

Plant Disease ◽  
2013 ◽  
Vol 97 (3) ◽  
pp. 296-306 ◽  
Author(s):  
W. E. Fry ◽  
M. T. McGrath ◽  
A. Seaman ◽  
T. A. Zitter ◽  
A. McLeod ◽  
...  
Keyword(s):  
United States ◽  
Late Blight ◽  
Phytophthora Infestans ◽  
Current Situation ◽  
Causal Agent ◽  
Community Supported Agriculture ◽  
Eastern United States ◽  
Tomato Crop ◽  
History Of ◽  
Mainstream Press

The tomato late blight pandemic of 2009 made late blight into a household term in much of the eastern United States. Many home gardeners and many organic producers lost most if not all of their tomato crop, and their experiences were reported in the mainstream press. Some CSAs (Community Supported Agriculture) could not provide tomatoes to their members. In response, many questions emerged: How did it happen? What was unusual about this event compared to previous late blight epidemics? What is the current situation in 2012 and what can be done? It's easiest to answer these questions, and to understand the recent epidemics of late blight, if one knows a bit of the history of the disease and the biology of the causal agent, Phytophthora infestans.

Climate change and Mediterranean agriculture: Impacts on winter wheat and tomato crop evapotranspiration, irrigation requirements and yield

2015 ◽  
Vol 147 ◽  
pp. 103-115 ◽  
Author(s):  
Sameh Saadi ◽  
Mladen Todorovic ◽  
Lazar Tanasijevic ◽  
Luis S. Pereira ◽  
Claudia Pizzigalli ◽  
...  
Keyword(s):  
Climate Change ◽  
Winter Wheat ◽  
Crop Evapotranspiration ◽  
Tomato Crop ◽  
Irrigation Requirements

USING THERMODYNAMIC DEHUMIDIFICATION IN SOILLESS TOMATO CROP IN GREENHOUSE: APPLICATION IN THE WEST OF FRANCE

2014 ◽  
pp. 563-568 ◽  
Author(s):  
B. Albert ◽  
S. Le Quillec ◽  
E. Brajeul ◽  
D. Lesourd ◽  
D. Loda
Keyword(s):  
The West ◽  
Tomato Crop

Responses of a long greenhouse tomato crop to summer CO2 enrichment

2006 ◽  
Vol 86 (Special Issue) ◽  
pp. 1395-1400 ◽  
Author(s):  
X. Hao ◽  
Q. Wang ◽  
S. Khosla
Keyword(s):  
Tomato Fruit ◽  
Co2 Enrichment ◽  
High Temperature Stress ◽  
Fruit Production ◽  
High Light Intensity ◽  
Vegetable Production ◽  
Tomato Crop ◽  
Tomato Production ◽  
Production Area ◽  
Marketable Fruit

While CO2 enrichment generally benefits tomato fruit production in winter its effects on summer tomato production (under high air temperature and strong ventilation) are still not clear, especially when the crop has been subjected to long-term CO2 enrichment in winter. Therefore, a study was initiated in 2005 to determine the feasibility of summer CO2 enrichment in southwestern Ontario, a major greenhouse vegetable production area in North America with very hot summers. The long tomato crop (cv. Rapsodie) was planted into rockwool slabs in six greenhouse compartments in January. From January to the middle of June, the tomato plants in all six greenhouse compartments were subjected to the same standard CO2 enrichment practice. From the end of June to August, three CO2 treatments (two compartments for each treatment) were applied: Control (ambient/no enrichment), Enrich1 (800 µL L-1 when ventilation was less than 10% and 400 µL L-1 when less than 50%) and Enrich2 (1200 µL L-1 when ventilation was less than 10% and 500 µL L-1 when less than 50%). In all treatments, CO2 enrichment ceased when ventilation requirement was more than 50%. Leaf photosynthesis, as indicated by the CO2 response curve, partially acclimated to the CO2 enrichment. Marketable fruit yield was reduced by the summer CO2 enrichment. Leaf deformation [short, thick, curled and somewhat crisp, dark grey-green leaves, so-called short leaf syndrome (SLS)] was observed in the greenhouse compartments with summer CO2 enrichment. SLS developed under high light intensity and high CO2 concentration might have limited response of the tomato crop to summer CO2 enrichment. Further investigation on the cause and mechanism of SLS is needed to improve the response of greenhouse tomatoes to summer CO2 enrichment. Key words: Photosynthesis, Lycopersicon esculentum, high temperature stress, acclimation

UPTAKE CONCENTRATIONS OF A TOMATO CROP IN DIFFERENT SALINITY CONDITIONS

2005 ◽  
pp. 365-369 ◽  
Author(s):  
J.J. Magán ◽  
E. Casas ◽  
M. Gallardo ◽  
R.B. Thompson ◽  
P. Lorenzo
Keyword(s):  
Tomato Crop

Saline water and municipal solid waste compost application on tomato crop: Effects on plant and soil

2015 ◽  
Vol 39 (4) ◽  
pp. 491-501 ◽  
Author(s):  
Rita Leogrande ◽  
Ornella Lopedota ◽  
Carolina Vitti ◽  
Domenico Ventrella ◽  
Francesco Montemurro
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Saline Water ◽  
Tomato Crop ◽  
Municipal Solid Waste Compost ◽  
Compost Application
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