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Showing 2 results for Hydroponic System
Effect of nutrient solution on growth and some physiological characters of hydroponically grown lettuce
M. Safaei, J. Panahandeh, S.j. Tabatabaei, A. Motallebiazar,
Volume 5, Issue 2 (7-2014)
Abstract

  Lettuce is one of the major leafy vegetables that is consumed as fresh and salads crops. Although, today, the tendency is to grow lettuce as hydroponic crop, there is not an optimal nutrient solution and growers use different nutrient solutions for growing lettuce. Therefore, an experiment was conducted to find an optimal nutrient solution to grow lettuce. In this experiment, the effect of various important nutrient solutions including, NSHog, NSKnop, NSUK, and NSU.T on two cultivars of lettuce (Siahoo and Conquistador) was investigated. The experiment was arranged in the randomized completely block design with four replicates and traits i.e., chlorophyll index, photosynthetic efficiency, tip burn, fresh and dry weight, leaf area, and number of edible leaves were assessed. Plants were sown in the media containing perlite and then irrigated with nutrient solution manually. The results showed that nutrient solution had significant effect on the yield and some of the growth characteristic of lettuce. Plants grown in the UK solution had the highest fresh and dry mass, leaf area, and the number of edible leaves. The lowest fresh and dry weight, leaf area and the number of edible leaves was obtained in plants supplied with UT solution. Results also showed significant variation between two cultivars. Siahoo had higher fresh weight, leaf area, and the number of edible leaves than conquistador. Interaction between cultivar and nutrient solution had significant effect on chlorophyll index. According to the results obtained, UK nutrient solution was the best nutrient solution for lettuce production.


Effects of Mg2+ and root zone temperature on growth, yield and physiological properties of greenhouse cucumber (Cucumis sativus L.) in hydroponics
R. Azarmi, J. Tabatabaei, N. Chaparzadeh,
Volume 9, Issue 2 (9-2018)
Abstract
Magnesium plays a key role in photosynthesis, partitioning of carbohydrates, phloem export of sucrose, photo-oxidation and leaf chlorosis of plants. In order to evaluate the effect of various concentrations of Mg (0 (control), 2 and 4 mM) in the nutrient solution and root zone temperature (RZT) (15, 25 and 35 ºС) on growth, yield and physiological properties in cucumber (Cucumis sativus L. cv. Nagen 792) grown in hydroponic system, an experiment was carried out as factorial based on randomized complete blocks design with four replications, in 2014. Results showed that zero Mg treatment (control) significantly decreased leaf fresh and dry weights, number of leaves, leaf area and SPAD index; but remarkably increased shoot to root ratio. These effects were more pronounced when control treatment was combined with RZT of 35ºС. The highest yield (578 g per plant) was observed in plants treated with concentration of 4 mM Mg and 15 ºС RZT. The lowest yield (276 g per plant) was obtained under concentration of 2 mM Mg and 35 ºС RZT. The Fv/Fm value increased with the increase of Mg concentration in the solution and with the decrease of root temperature. Increased Mg concentration in the nutrient solution increased leaf Mg and root phosphorus (P) content. Leaf P content increased as RZT increased. Whereas, root P content decreased as RZT increased. It can be concluded from the results of this research that increasing Mg concentration in the solution decreased the adverse effects 35 ºС RZT. Therefore, Mg concentration of 4 Mm in the solution and 15 ºС RZT can be considered as an appropriate treatment for hydroponic cucumber cultivation.

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