scholarly journals Simulation of Excess Nutrient Solution Volume of Greenhouse Cucumber Under Soilless Culture

2018 ◽  
Author(s):  
Jing Hu ◽  
Guopeng Chen ◽  
Xinhao Gao ◽  
Chunyun Zhang ◽  
Yifang Wen
Keyword(s):  
Nutrient Solution ◽  
Soilless Culture ◽  
Greenhouse Cucumber ◽  
Solution Volume

scholarly journals Simulation of excess nutrient solution volume of greenhouse cucumber under soilless culture

2020 ◽  
Vol 559 ◽  
pp. 012003
Author(s):  
Jing Hu ◽  
Zhennan Liu ◽  
Jianwu Zhuang ◽  
Bin Dai ◽  
Wei Liu ◽  
...  
Keyword(s):  
Nutrient Solution ◽  
Soilless Culture ◽  
Greenhouse Cucumber ◽  
Solution Volume

scholarly journals Thermography Study of Moderate Electrical Conductivity and Nutrient Solution Distribution System Effects on Grafted Tomato Soilless Culture

HortScience ◽  
2013 ◽  
Vol 48 (12) ◽  
pp. 1508-1512 ◽  
Author(s):  
Isidro Morales ◽  
Miguel Urrestarazu
Keyword(s):  
Electrical Conductivity ◽  
Nutrient Solution ◽  
Distribution System ◽  
Distribution Systems ◽  
Quality Parameters ◽  
Moderate Increase ◽  
Soilless Culture ◽  
Tomato Crop ◽  
Tomato Production ◽  
Four Blocks

In recent decades, salinity in the culture of tomatoes has been one of the most studied parameters. This study aimed to evaluate the effect of a moderate increase in salinity, fertigation distribution, and its control using thermography on a soilless culture of grafted tomato. A tomato crop (cv. Ramyle) grafted onto tomato rootstocks (cv. Emperor) was cultivated in coir crop units at the University of Almeria from Nov. 2012 to May 2013. A plot design subdivided with four blocks was used, with salinity values of 2.0 and 2.5 dS·m−1 in the main plots and fertigation distribution systems with either one (DD1) or four (DD4) drip manifolds in the subplots. The crop productivity was measured using total crop yield, commercial value, and size. The quality parameters in the fruits were not significantly affected. Thermographies were used to aid the control of differential transpiration exerted by salinity. The difference in salinity did not significantly affect the total or commercial production. However, despite being grafted plants, there was a statistically significant effect (P ≤ 0.05) on the fruit size distribution when the electrical conductivity (EC) of the nutrient solution was increased from 2.0 to 2.5 dS·m−1, with a lower production (16%) of large fruits and an increased production of smaller fruits. The DD4 system significantly increased large tomato production (22%) compared with DD1, and the quality parameters in the fruits were not significantly affected. As a result of the improvement in tomato size, the DD4 distribution system economically offset the required higher initial expenditure compared with the DD1 system. Thermography was revealed to be a robust, simple, and quick tool for diagnosing the effect of salinity on transpiration.

scholarly journals Fruit Yield, Size, and Color Responses of Two Greenhouse Cucumber Types to Nitrogen Fertilization in Perlite Soilless Culture

2005 ◽  
Vol 15 (3) ◽  
pp. 565-571 ◽  
Author(s):  
C. Jasso-Chaverria ◽  
G.J. Hochmuth ◽  
R.C. Hochmuth ◽  
S.A. Sargent
Keyword(s):  
Nutrient Solution ◽  
Fruit Production ◽  
N Fertilization ◽  
N Concentration ◽  
Hue Angle ◽  
Greenhouse Cucumber ◽  
Leaf N Concentration ◽  
Black Plastic ◽  
Spring Harvest ◽  
Leaf N

Two greenhouse cucumber (Cucumis sativus) cultivars with differing fruit types [European (`Bologna') and Beit-alpha (`Sarig')] were grown during two seasons in a perlite medium in black plastic nursery containers in a passively ventilated greenhouse in northern Florida to evaluate fruiting responses to nitrogen (N) fertilization over the range of 75 to 375 mg·L–1. Fruit production, consisting mostly of fancy fruits, increased quadratically with N concentration in the nutrient solution, leveling off above 225 mg·L–1 for both cucumber cultivars. Fruit length and diameter were not affected by N concentration in the nutrient solution. Leaf N concentration, averaged over three sampling dates, increased linearly with N concentration in the nutrient solution from 46 g·kg–1 with 75 mg·L–1 N to 50 g·kg–1 with 375 mg·L–1 N. Fruit firmness decreased with increasing N concentration and there was little difference in firmness between the two cultivars. Firmness was similar across three measurement dates during the spring harvest season, but increased during the season in the fall. Fruit color responses to N concentration were dependent on the specific combination of experiment, sampling date, and cultivar. For most combinations of experiment, sampling date, and cultivar, cucumber epidermal color was greener (higher hue angle) with increased N concentration. The color was darkest (lowest L* value) and most intense (highest chroma value) with intermediate to higher N concentrations.

scholarly journals Evolution of Nutritional Value of Two Tomato Genotypes Grown in Soilless Culture as Affected by Macrocation Proportions

HortScience ◽  
2006 ◽  
Vol 41 (7) ◽  
pp. 1584-1588 ◽  
Author(s):  
Simone Fanasca ◽  
Giuseppe Colla ◽  
Youssef Rouphael ◽  
Francesco Saccardo ◽  
Giuseppe Maiani ◽  
...  
Keyword(s):  
Nutrient Solution ◽  
Tocopherol Content ◽  
Soilless Culture ◽  
Fresh Weight ◽  
Fruit Tissue ◽  
Ripening Stages ◽  
Lycopene Content ◽  
Antioxidant Concentration ◽  
Standard Cultivar ◽  
Β Carotene

A greenhouse experiment was carried out to determine the effect of cationic proportions (K, Ca, Mg) in the nutrient solution on carotenoids and α-tocopherol content at green–orange, orange, red, and intense-red ripening stages using a high-pigment tomato (Lycopersicon esculentum Mill.) cultivar hp (`Lunarossa') and a standard cultivar (`Corfù') grown in a soilless culture. The highest lycopene concentration was observed in the `hp' cultivar at the red and intense-red ripening stages (3.0 mg/100 g fresh weight and 3.2 mg/100 g fresh weight respectively). In both cultivars, the concentration of β-carotene increased during the ripening stages, reaching the highest value (0.6 mg/100 g fresh weight) at the intense-red stage. The hp cultivar has guaranteed higher lycopene (average, 2.0 mg/100 g fresh weight vs. 1.7 mg/100 g fresh weight) and α-tocopherol contents (average, 1.2 mg/100 g fresh weight vs. 0.9 mg/100 g fresh weight) than those of the standard. In both cultivars, a high proportion of K in the nutrient solution increased antioxidant concentration β-carotene and especially lycopene) during the red and intense-red ripening stages, followed by Mg. The lowest values were recorded for the Ca treatment. Lastly, a positive correlation was recorded between fruit tissue K and lycopene content, whereas a negative correlation was observed between fruit tissue Ca and lycopene content.

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