Monthly average daily diffuse solar radiation in Poland within the period 2005–2015

Kleniewska, Małgorzata; Mitrowska, Dorota; Chojnicki, Bogdan H.

doi:10.1051/itmconf/20182300020

Cited by 2 publications

(2 citation statements)

References 18 publications

(14 reference statements)

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“…In the months with low irradiation intensity (November, December and January), the yield was at a significantly lower level than in the remaining months, where the effect of natural light on the amount of obtained marketable yield of cucumber plants was marked ( Table 1 ). According to Kleniewska et al [ 41 ], the monthly averaged daily diffuse solar radiation in Poland during these months is 1.35, 1.30 and 1.25 MJ m −2 respectively.…”

Section: Resultsmentioning

confidence: 99%

Photosynthetic Efficiency and Yield of Cucumber (Cucumis sativus L.) Grown under HPS and LED Lighting in Autumn–Winter Cultivation

Gajc-Wolska

Kowalczyk

Przybysz³

et al. 2021

Plants

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The objective of this study was to evaluate the effect of the supplemental lighting of cucumber with sodium pressure lamps (HPSs) and light-emitting diodes (LEDs) on photosynthetic efficiency and yield in autumn–winter cultivation. Cucumber plants of the ‘Svyatogor’ F1 midi-cucumber parthenocarpic type cultivar were grown on mineral wool mats in three compartments, differing only in the type of light, i.e., (1) HPS top lighting (HPS) in the first compartment, (2) HPS top lighting and LED panel interlighting (HPS + LED) in the second compartment and (3) LED top lighting and inter-row LED panels (LED) in the third compartment. The photosynthetically active radiation was the same in each compartment. The study showed that the highest commercial yields of cucumber could be achieved under LED light (top and inter-row). The chlorophyll content in the leaf blade of younger leaves was higher in plants under LED lighting. This type of lighting also had a positive effect on the gas exchange of plants (net carbon assimilation, stomatal conductance, transpiration). LED and HPS + LED lighting increased the chlorophyll a fluorescence parameters, such as Fs, Fm’ and vitality index (PI), in both younger and older leaves, which also increased the fruit yield in the tested combinations.

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Section: Resultsmentioning

confidence: 99%

Photosynthetic Efficiency and Yield of Cucumber (Cucumis sativus L.) Grown under HPS and LED Lighting in Autumn–Winter Cultivation

Gajc-Wolska

Kowalczyk

Przybysz³

et al. 2021

Plants

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“…In Poland, diffuse radiation typically makes up 51% of the total solar radiation: approx. 41% in summer and up to 61% in winter (Kleniewska et al 2018). The quantity of S↓ is determined not only by the angle of solar rays, but also by the optical properties of the atmosphere, mainly cloudiness and water vapour and aerosol content in the air (Yu et al 2006).…”

Section: Introductionmentioning

confidence: 99%

The influence of cloudiness and atmospheric circulation on radiation balance and its components

Kejna

Uscka-Kowalkowska

Kejna³

2021

Theor Appl Climatol

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The article contains an analysis of the influence of cloudiness and atmospheric circulation on the components of radiation balance (Q*) using the example of measurements taken in an extra-urban area of Koniczynka near Toruń (Central Poland) in the years 2011–2018. The average annual value of Q* was 1,818.5 MJ·m−2 with a maximum of 352.3 MJ·m−2 in June, and negative values from November to January (December: −27.4 MJ·m−2). The shortwave radiation balance (S*) amounted to 3,129.2 MJ·m−2 and the longwave radiation balance (L*) was ˗1,310.7 MJ·m−2. In June the average solar irradiance (S↓) at midday was 600 W·m−2. The natural annual and diurnal course of Q* components, determined by astronomical factors, is disturbed by changes in cloudiness and inflow of various air masses. It has been found that an increase in cloudiness causes the amount of incoming solar radiation (S↓) to fall, thus decreasing the S* balance. Moreover, clouds restrict longwave radiation balance (L*), in particular, downward atmospheric radiation (L↓) increases. The opposite relationships of S* and L* affect Q* in individual months. The components of Q* are influenced by atmospheric circulation; it has been observed that anticyclonic types, characterised by smaller cloud amounts, favour a greater influx of (S↓) and—at the same time—greater emittance (L↑); however, Q* is then greater than in the case of cyclonic circulation. A statistically significant trend of Q* and its components has not been ascertained. A notable great year-on-year variability of Q*, ranging from 1,640.4 MJ·m−2 (in 2011) to 2,081.6 MJ·m−2 (in 2018), affects the environment. The changes are related to the cloudiness and the frequency of occurrence of different atmospheric circulation types. The role of snow cover is also important as snow reflects solar radiation which leads to the decrease of S* and—as a result—to a negative value of Q* in winter.

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Monthly average daily diffuse solar radiation in Poland within the period 2005–2015

Cited by 2 publications

References 18 publications

Photosynthetic Efficiency and Yield of Cucumber (Cucumis sativus L.) Grown under HPS and LED Lighting in Autumn–Winter Cultivation

Photosynthetic Efficiency and Yield of Cucumber (Cucumis sativus L.) Grown under HPS and LED Lighting in Autumn–Winter Cultivation

The influence of cloudiness and atmospheric circulation on radiation balance and its components

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