scholarly journals LED Dim Light Irradiation of the Root Zone Influences Growth and Development of Leaf Lettuce (Lactuca sativa) Plants under Nutrient Film Technique Hydroponics

2012 ◽  
Vol 50 (2) ◽  
pp. 101-106 ◽  
Author(s):  
Naomichi FUJIUCHI ◽  
Kazuhiro FUJIWARA
Keyword(s):  
Lactuca Sativa ◽  
Growth And Development ◽  
Root Zone ◽  
Light Irradiation ◽  
Nutrient Film Technique ◽  
Dim Light ◽  
Leaf Lettuce

scholarly journals Effects of Root Zone Cooling on Lactuca Sativa Cultivation Under Roof Top Garden Structure in Tropical Climatic Conditions

2021 ◽  
Author(s):  
Ahmad Syafik Suraidi Sulaiman ◽  
A S Bujang ◽  
S A Hassim ◽  
M S Azman ◽  
M S Hassan Basri
Keyword(s):  
Lactuca Sativa ◽  
Crop Yields ◽  
Control Method ◽  
Root Zone ◽  
Cooling System ◽  
Climatic Conditions ◽  
Cooling Method ◽  
Yield Parameters ◽  
Nutrient Film Technique ◽  
And Control

A roof top garden structure was installed on top of a 20-foot freight container plant factory in MARDI Serdang, Selangor. The roof top garden consists of 3 major components which is a rain shelter, a reticulated hydroponic growing system via Nutrient Film Technique (NFT) and a chiller system to chill and control nutrient-water temperature in the fertilizer tank. Lactuca sativa was cultivated using root zone cooling, with a hydroponic setup at ambient temperature as control to study the effects of the root zone cooling system (RZC) on the crop yields in the tropics. The weight of crop, weight of root, leaf width and leaf numbers of Lactuca sativa have been selected as yield parameters, recorded and analyzed. From the results, all the growing parameters performance for Lactuca sativa grown in root zone cooling method were found to better compared to control. For yield parameters performance, Lactuca sativa grown in control were found to be better, compared to root zone cooling method. The yield weight for Lactuca sativa cultivated using control is higher than RZC system by 39.4 %, ranging from 36.69- 39.04 g using control and from 20.59-23.66 g by using RZC method. Roots weight for Lactuca sativa cultivated using control method is better than RZC by 14.1 %, ranging from 5.73- 6.22 g using control, meanwhile from 4.69-5.34 g by using RZC respectively. Number of leaves for Lactuca sativa cultivated using control method is more than RZC by 26 %, ranging from 14-15 using control and static at 11 by using RZC system. The leaves dimension for Lactuca sativa cultivated using control is bigger than RZC by 48 %. The range of Lactuca sativa leaves dimension cultivated using control method is from 580.35-670.27 cm2, meanwhile by RZC is from 318.68-348.45 cm2.   Keywords: root zone cooling; roof top garden; Lactuca sativa; tropics         

scholarly journals Nutrient Availability for Lactuca sativa Cultivated in an Amended Peatland: An Ionic Exchange Study

Nitrogen ◽  
2022 ◽  
Vol 3 (1) ◽  
pp. 26-42
Author(s):  
Jacynthe Dessureault-Rompré ◽  
Alexis Gloutney ◽  
Jean Caron
Keyword(s):  
Nutrient Availability ◽  
Lactuca Sativa ◽  
Root Zone ◽  
Plant Root ◽  
N Uptake ◽  
Growth Cycle ◽  
Conservation Strategy ◽  
Conservation Strategies ◽  
Ionic Exchange ◽  
Vegetable Crops

Few conservation strategies have been applied to cultivated peatland. This field study over one growth cycle of Lactuca sativa examined the effect of plant-based, high-C/N-ratio amendments in a real farming situation on peatland. Plant Root Simulator (PRS®) probes were used directly in the field to assess the impacts of incorporating Miscanthus x giganteus straw and Salix miyabeana chips on nutrient availability for lettuce. The results showed that lettuce yield decreased by 35% in the miscanthus straw treatment and by 14% in the willow chip treatment. In addition, the nitrogen flux rate was severely reduced during crop growth (75% reduction) and the plant N uptake index was much lower in the amended treatments than in the control. The phosphorus supply rate was also significantly lower (24% reduction) in the willow treatment. The influence of sampling zone was significant as well, with most macro-nutrients being depleted in the root zone and most micro-nutrients being mobilized. Additional work is needed to optimize the proposed conservation strategy and investigate the effects of consecutive years of soil amendment on different vegetable crops and in different types of cultivated peatlands to confirm and generalize the findings of this study. Future field studies should also explore the long-term carbon dynamics under plant-based, high-C/N-ratio amendments to determine if they can offset annual C losses.

scholarly journals Changes in the Chemical Composition of Six Lettuce Cultivars (Lactuca sativa L.) in Response to Biofortification with Iodine and Selenium Combined with Salicylic Acid Application

Agronomy ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 660 ◽  
Author(s):  
Sylwester Smoleń ◽  
Iwona Kowalska ◽  
Peter Kováčik ◽  
Włodzimierz Sady ◽  
Marlena Grzanka ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Chemical Composition ◽  
Lactuca Sativa ◽  
Negative Impact ◽  
Biomass Productivity ◽  
Ascorbic Acid Content ◽  
Greenhouse Study ◽  
Lactuca Sativa L ◽  
Nutrient Film Technique ◽  
Nutrient Solutions

A two-year greenhouse study was conducted to assess the effects of the application of I (as KIO3), Se (as Na2SeO3), and salicylic acid (SA) in nutrient solutions on the chemical composition of six lettuce cultivars, i.e., two butterhead lettuces (BUTL), “Cud Voorburgu” and “Zimująca”; two iceberg lettuces (ICEL), “Maugli” and “Królowa lata”; and two Lactuca sativa L. var. crispa L. (REDL) cultivars, “Lollorossa” and “Redin”, grown in the NFT (nutrient film technique) system. The treatments were as follows: control, I+Se, I+Se+0.1 mg SA dm−3, I+Se+1.0 mg SA dm−3, and I+Se+10.0 mg SA dm−3. KIO3 was used at a dose of 5 mg I dm−3, while Na2SeO3 was used at 0.5 mg Se dm−3. The application of I+Se was a mild abiotic stress factor for the plants of the ICEL and REDL cultivars. In contrast, I+Se did not have a negative impact on the BUTLcultivars. The application of 1.0 mg SA dm−3 improved the biomass productivity in all cultivars compared with I+Se. In the majority of the cultivars, the applied combinations of I+Se and I+Se+SA resulted in a reduction in the nitrate(V) content that was beneficial to the consumer and increased levels of sugars, phenols, phenylpropanoids, flavonols, and anthocyanins. In addition, an increase in ascorbic acid content was observed, but only in the BUTL cultivars and REDL “Redin”. The application of I, Se, and SA had upward or downward effects on the concentrations of N, K, P, Ca, Mg, S, Na, B, Cu, Fe, Mn, Mo, and Zn in the leaves.

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