scholarly journals The Effect of Plant Growth Compensation by Adding Silicon-Containing Fertilizer under Light Stress Conditions

Plants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1287
Author(s):  
Natalya A. Semenova ◽  
Alexandr A. Smirnov ◽  
Andrey A. Grishin ◽  
Roman Y. Pishchalnikov ◽  
Denis D. Chesalin ◽  
...  
Keyword(s):  
Plant Growth ◽  
Nutrient Solution ◽  
Negative Impact ◽  
Light Emitting Diode ◽  
Light Stress ◽  
Growth Period ◽  
Positive Influence ◽  
Biologically Active ◽  
Light Emitting ◽  
Growing Period

The effects of different spectral compositions of light-emitting diode (LED) sources and fertilizer containing biologically active silicon (Si) in the nutrient solution on morphological and physiological plant response were studied. Qualitative indicators and the productivity of plants of a red-leaved and a green-leaved lettuce were estimated. Lettuce was grown applying low-volume hydroponics in closed artificial agroecosystems. The positive effect of Si fertilizer used as a microadditive in the nutrient solution on the freshly harvested biomass was established on the thirtieth day of vegetation under LEDs. Increase in productivity of the red-leaved lettuce for freshly harvested biomass was 26.6%, while for the green-leaved lettuce no loss of dry matter was observed. However, being grown under sodium lamps, a negative impact of Si fertilizer on productivity of both types of plants was observed: the amount of harvested biomass decreased by 22.6% and 30.3% for the green- and red-leaved lettuces, respectively. The effect of using Si fertilizer dramatically changed during the total growing period: up to the fifteenth day of cultivation, a sharp inhibition of the growth of both types of lettuce was observed; then, by the thirtieth day of LED lighting, Si fertilizer showed a stress-protective effect and had a positive influence on the plants. However, by the period of ripening there was no effect of using the fertilizer. Therefore, we can conclude that the use of Si fertilizers is preferable only when LED irradiation is applied throughout the active plant growth period.

scholarly journals Effect of the Spectral Quality and Intensity of Light-emitting Diodes on Several Horticultural Crops

HortScience ◽  
2016 ◽  
Vol 51 (3) ◽  
pp. 268-271 ◽  
Author(s):  
Miguel Urrestarazu ◽  
Cinthia Nájera ◽  
María del Mar Gea
Keyword(s):  
Plant Growth ◽  
Light Emitting Diode ◽  
Photon Flux ◽  
Photosynthetic Response ◽  
Light Spectrum ◽  
Light Emitting ◽  
Artificial Lighting ◽  
Horticultural Crops ◽  
Distribution Study ◽  
Environment Chamber

Light-emitting diode (LED) lamps signify one of the most important advances in artificial lighting for horticulture over the last few decades. The objective of this study was to compare the cultivation of four horticultural plants using a conventional white LED tube (T0) light against one with a good spectral fit to the maximum photosynthetic response (T1) at two intensities. The experiment was carried out with two types of young lettuce, tomato, and bell pepper plants. In a controlled environment chamber, six and four lamps per square meter were used to achieve high (H) and low (L) intensity, respectively. We measured the lighting parameters illuminance (lux) and photosynthetic photon flux (PPF) intensity (µmol·m−2·s−1). The dry and fresh weight, leaf area (LA), and specific index were measured to gauge plant growth. The photosynthetic activity and energy efficiency (EE) were recorded for each species over 60 days of cultivation. The results clearly demonstrate that, compared with conventional LED lamps, the specific horticultural LED lamps with an improved light spectrum increased the EE of the evaluated vegetables by 26%. At both the studied light intensities, plant growth was clearly more closely linked to the spectral fit of the light to the maximum photosynthetic response recorded by McCree (1972) than to PPF or illuminance (lux). We therefore suggest that a specific, detailed spectral distribution study be conducted to predict the effect of the specific quantity and quality of light used in this study on a single parameter of plant growth.

scholarly journals Supplementary Far-Red Light Did Not Affect Tomato Plant Growth or Yield under Mediterranean Greenhouse Conditions

Agronomy ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1849
Author(s):  
Onofrio Davide Palmitessa ◽  
Beniamino Leoni ◽  
Francesco Fabiano Montesano ◽  
Francesco Serio ◽  
Angelo Signore ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Plant Growth ◽  
Fruit Quality ◽  
Light Emitting Diode ◽  
Red Light ◽  
Growth Yield ◽  
Fruit Production ◽  
F1 Hybrid ◽  
Light Emitting ◽  
Red Radiation

In the Mediterranean region, tomato plants are often cultivated in two short cycles per year to avoid the heat of summer and the low solar radiation of winter. Supplementary light (SL) makes it possible to cultivate during the dark season. In this experiment, a tomato F1 hybrid cultivar DRW7723 was cultivated in a greenhouse for a fall-winter cycle. After transplant, light emitting diode (LED) interlighting, with two light spectra (red + blue vs. red + blue + far-red) was applied as SL. Plant growth, yield, gas exchange, nutrient solution (NS) consumption, and fruit quality were analyzed. In general, the effects of adding far-red radiation were not visible on the parameters analyzed, although the yield was 27% higher in plants grown with SL than those grown without. Tomatoes had the same average fresh weight between SL treatments, but the plants grown with SL produced 16% more fruits than control. Fruit quality, gas exchange and NS uptake were not influenced by the addition of far-red light. Interlighting is, therefore, a valid technique to increase fruit production in winter but at our latitude the effects of adding far-red radiation are mitigated by available sunlight.

scholarly journals Supplemental LED lighting increases pansy growth

2015 ◽  
Vol 33 (4) ◽  
pp. 428-433
Author(s):  
Nezihe Koksal ◽  
Meral Incesu ◽  
Ahmet Teke
Keyword(s):  
Plant Growth ◽  
Growth And Development ◽  
Plant Biomass ◽  
Light Emitting Diode ◽  
Low Light ◽  
Light Emitting ◽  
Led Lighting ◽  
Light Levels ◽  
Long Day ◽  
Number Of Branches

ABSTRACT: Pansy (Viola cornuta) is a facultative long-day plant that flowers from October until March in Turkey. During the winter months, low light levels can limit plant growth and development. Light emitting diodes (LEDs) can provide supplemental lighting in greenhouses which produce same light intensity with less energy than conventional incandescent lighting. Light emitting diode technologies have enabled affordable and efficient light systems to be installed in greenhouses and plastic tunnels in the field. In this experiment we evaluated the effects of supplemental red-orange LED lightening on the growth and development of pansy cv. Blue Blotch grown in plastic tunnels. The energy, which LEDs are to consume, was provided through a solar panel system with the aim of drawing attention to the cleanliness of solar energy source. Five hours of supplement LED lighting was applied after dusk starting from November to February. Pansy growth and development parameters were compared with non-light supplied control plants. Supplemental LED lighting significantly increased plant biomass weight, flower number and leaves number at the rate of 52%, 72%, and 47%, respectively. Moreover, LED lighting increased plant growth rate (0.109 and 0.306 g of fresh weight), compared with the no light control. LED lighting, however, had no effect on length of stems, number of branches and the diameter of flowers. Thus, this study indicated that pansies are light limited during the winter months and supplemental LED lighting can significantly increase pansy growth and development.

scholarly journals Impact of Superabsorbent Polymers and Variety on Yield, Quality and Physiological Parameters of the Sugar Beet (Beta vulgaris prov. Altissima Doell)

Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 757
Author(s):  
Vladimír Pačuta ◽  
Marek Rašovský ◽  
Beata Michalska-Klimczak ◽  
Zdzislaw Wyszyňski
Keyword(s):  
Sugar Beet ◽  
Negative Impact ◽  
Sugar Content ◽  
Photosynthetic Apparatus ◽  
Vegetation Period ◽  
Positive Influence ◽  
Superabsorbent Polymers ◽  
Growing Period ◽  
Physiological Processes ◽  
Close Relationship

In this study, we focus on the mitigation of the negative impact of drought using the application of superabsorbent polymers (SAPs) to seed. One way to monitor drought and quantify its impact on crops in field conditions is the nondestructive measurement of physiological processes of the crops using spectral indexes LAI and PRI during vegetation. Therefore, during 2018 and 2019, the increase in biomass and intensity of photosynthetic activity was monitored, and the effect of the SAPs application on the yield parameters of the sugar beet was evaluated in the trial conditions (control, SAPs) at the end of the vegetation period. Through statistical analysis, the significant impact (α ≤ 0.01) of SAPs application on the values of spectral indexes LAI and PRI as well as root and white sugar yields was found. Although the sugar content difference between SAPs and control conditions was not statistically significant, SAPs had a positive influence on the value of this parameter. It was found through periodic monitoring of spectral indexes during the growing period that the crop in the SAPs condition showed higher values of PRI at the beginning of vegetation, which was caused by the accumulation of moisture in the vicinity of the seed and subsequent faster growth of roots and photosynthetic apparatus. Moreover, the values of LAI were significantly higher (α ≤ 0.01) in the SAPs condition throughout the vegetation period. In the interaction evaluation, we confirmed that in both years the values of LAI were higher in the condition with SAPs compared with the control. In contrast, the PRI values were significantly different across conditions. The interaction of conditions with variety showed that the variety Brian obtained higher values of LAI and PRI in the SAPs condition. The correlation analysis found a positive correlation between spectral indexes LAI:PRI (r = 0.6184**), and between LAI:RY (r = 0.6715**), LAI:WSY (r = 0.5760**), and PRI:RY (r = 0.5038*), which confirms the close relationship between physiological processes in the plant and the size of its yield.

scholarly journals Filtering Light-Emitting Diodes to Investigate Amber and Red Spectral Effects on Lettuce Growth

Plants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1075
Author(s):  
Bo-Sen Wu ◽  
Sarah MacPherson ◽  
Mark Lefsrud
Keyword(s):  
Plant Growth ◽  
Photosynthetic Activity ◽  
Light Emitting Diode ◽  
Red Light ◽  
Plant Productivity ◽  
Plant Performance ◽  
Light Emitting ◽  
Amber Light ◽  
Light Spectra ◽  
Future Work

Red and blue light are the principal wavelengths responsible for driving photosynthetic activity, yet amber light (595 nm) has the highest quantum efficiency and amber-rich high pressure sodium lamps result in superior or comparable plant performance. On this basis, we investigated how lettuce plant growth and photosynthetic activity were influenced by broad and narrow light spectra in the 590–630 nm range, by creating amber and red light-emitting diode (LED) spectra that are not commercially available. Four different light spectra were outfitted from existing LEDs using shortpass and notch filters: a double peak spectrum (595 and 655 nm; referred to as 595 + 655-nm light) that excluded 630-nm light, 595-nm, 613-nm, and 633-nm light emitting at an irradiance level of 50 W·m−2 (243–267 µmol·m−2·s−1). Shifting LED wavelengths from 595 nm to 633 nm and from 595 nm to 613 nm resulted in a biomass yield decrease of ~50% and ~80%, respectively. When 630-nm light is blocked, lettuce displayed expanded plant structures and the absence of purple pigmentation. This report presents a new and feasible approach to plant photobiology studies, by removing certain wavelengths to assess and investigate wavelength effect on plant growth and photosynthesis. Findings indicate that amber light is superior to red light for promoting photosynthetic activity and plant productivity, and this could set precedence for future work aimed at maximizing plant productivity in controlled environment agriculture.

Improved luminescence and energy-transfer properties of Ca14Al10Zn6O35:Ti4+,Mn4+ deep-red-emitting phosphors with high brightness for light-emitting diode (LED) plant-growth lighting

2018 ◽  
Vol 47 (38) ◽  
pp. 13713-13721 ◽  
Author(s):  
Zhi Zhou ◽  
Yiran Li ◽  
Mao Xia ◽  
Yuan Zhong ◽  
Nan Zhou ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Plant Growth ◽  
Light Emitting Diode ◽  
High Brightness ◽  
Red Emission ◽  
Light Emitting ◽  
Transfer Properties

Energy transfer from Ti4+ to Mn4+ was observed and verified in high brightness deep-red emission phosphors CAZO:Ti4+,Mn4+.

Effect of various monochromatic light-emitting diode colours on the behaviour and welfare of broiler chickens

2020 ◽  
Vol 100 (4) ◽  
pp. 615-623
Author(s):  
Shabiha Sultana ◽  
Md. Rakibul Hassan ◽  
Byung Soo Kim ◽  
Kyeong Seon Ryu
Keyword(s):  
Broiler Chickens ◽  
Light Emitting Diode ◽  
Monochromatic Light ◽  
Growth Period ◽  
Broiler Chicks ◽  
Light Emitting ◽  
Gait Score ◽  
Set Up ◽  
Effect Of Light ◽  
Sitting Behaviour

This study was conducted to evaluate the effect of different monochromatic light-emitting diode colours on the behaviour and welfare of broiler chicks. A total of 750 one-day-old chicks were used and lighting was set up as follows: pure blue (PB, 440–450 nm), bright blue (460–470 nm), sky blue (480–490 nm), greenish blue (500–510 nm), and green (530–540), while fluorescent white (400–700 nm) was used as a control. Birds were placed into 30 independent light proof pens and each light treatment was replicated five times with 25 birds in each pen. Video was recorded and behaviour was evaluated twice per day and observed five consecutive days in a week. Broiler welfare was evaluated using the characteristics of gait score, tibia dyschondroplasia, tonic immobility duration, and heterophil:lymphocyte ratio. In results, sitting, walking, and ground pecking behaviour were influenced by the light colour from 0 to 7 d. Extending the rearing period from 8 to 21 d resulted in increased sitting behaviour and decreased walking and pecking behaviour in chicks in the PB treatment (P < 0.05). When the growth period was extended further (22–42 d), sitting behaviour increased when chicks were exposed to PB light (P < 0.05). The effect of light colour did not significantly influence welfare of broiler chicks. Thus, the present results suggest that PB light colour decreased broiler chickens movement and thus increased duration of sitting behaviour. These results would be helpful to choose light colour for broiler producers.

scholarly journals Design of Multicolour LED with Control and Monitoring System for Plant Growth

2018 ◽  
Vol 215 ◽  
pp. 01007
Author(s):  
Wei Choon Ng ◽  
Nurul Amziah Md Yunus ◽  
Izhal Abdul Halin
Keyword(s):  
Plant Growth ◽  
Light Emitting Diode ◽  
Control Variable ◽  
Variable Parameter ◽  
Light Emitting ◽  
Growth Environment ◽  
Growth Area ◽  
Artificial Environment ◽  
Control And Monitoring System ◽  
And Control

The aim of this work is to create an artificial environment LED based for plants where the goal is to control LED lighting and monitor plant growth. This will contribute on issue like food production. This work involves the use of a web development microcontroller kit, which will help to make online or IoT (Internet of Things) project and design easy. The microcontroller will come with an integrated Wi-Fi to collect and control variable parameter and also programming language to develop graphical user interface (GUI). It is expected that the plant growth environment can be monitored and controlled or set through cloud via Wi-Fi on the board. Multicolour light emitting diode (LED) lamps are used. This system will improve the performance of available plant growth area where it will become more flexible in term of providing artificial environment with a better supervision.

Sign in / Sign up

Export Citation Format

Share Document