Abstract
The aim of this work were to choose a quantitative optimality criterion for estimating the quality of plant LED lighting regimes inside space greenhouses and to construct regression models of crop productivity and the optimality criterion depending on the level of photosynthetic photon flux density (PPFD), the proportion of the red component in the light spectrum and the duration of the duty cycle (Chinese cabbage Brassica сhinensis L. as an example). The properties of the obtained models were described in the context of predicting crop dry weight and the optimality criterion behavior when varying plant lighting parameters. Results of the fractional 3-factor experiment demonstrated the share of the PPFD level participation in the crop dry weight accumulation was 84.4% at almost any combination of other lighting parameters, but when PPFD value increased up to 500 µmol m −2 s −1 the pulse light and supplemental light from red LEDs could additionally increase crop productivity. Analysis of the optimality criterion response to variation of lighting parameters showed that the maximum coordinates were the following: PPFD = 500 µmol m −2 s −1 , about 70%-proportion of the red component of the light spectrum (PPFD LEDred /PPFD LEDwhite = 1.5) and the duty cycle with a period of 501 µs. Thus, LED crop lighting with these parameters was optimal for achieving high crop productivity and for efficient use of energy in the given range of lighting parameter values.
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Claims 7
Claim · model-written summary
PPFD level accounted for 84.4% of crop dry weight accumulation at almost any combination of other lighting parameters.
- Taxon
- Chinese cabbage
Brassica rapa subsp. pekinensise0 - Treatment
- PPFD levele1
- Outcome
- crop dry weight accumulatione1
- Value
- 84.4%e1
- Qualifier
- at almost any combination of other lighting parameterse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chinese cabbage”
e1“the share of the PPFD level participation in the crop dry weight accumulation was 84.4% at almost any combination of other lighting parameters”
Claim · model-written summary
Pulse light could additionally increase crop productivity when PPFD was increased up to 500 µmol m −2 s −1.
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensise0
- Treatment
- pulse lighte2
- Outcome
- crop productivitye2
- Direction
- increasee2
- Qualifier
- when PPFD value increased up to 500 µmol m −2 s −1e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chinese cabbage”
e2“when PPFD value increased up to 500 µmol m −2 s −1 the pulse light and supplemental light from red LEDs could additionally increase crop productivity”
Claim · model-written summary
Supplemental light from red LEDs could additionally increase crop productivity when PPFD was increased up to 500 µmol m −2 s −1.
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensise0
- Treatment
- supplemental light from red LEDse2
- Outcome
- crop productivitye2
- Direction
- increasee2
- Qualifier
- when PPFD value increased up to 500 µmol m −2 s −1e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chinese cabbage”
e2“when PPFD value increased up to 500 µmol m −2 s −1 the pulse light and supplemental light from red LEDs could additionally increase crop productivity”
Claim · model-written summary
The optimality criterion reached its maximum at PPFD = 500 µmol m −2 s −1.
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensise0
- Treatment
- PPFDe3
- Outcome
- maximum coordinatese3
- Value
- PPFD = 500 µmol m −2 s −1e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chinese cabbage”
e3“the maximum coordinates were the following: PPFD = 500 µmol m −2 s −1”
Claim · model-written summary
The optimality criterion maximum was at about 70% red component of the light spectrum (PPFD LEDred /PPFD LEDwhite = 1.5).
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensise0
- Outcome
- proportion of the red component of the light spectrume4
- Value
- about 70%e4
- Qualifier
- PPFD LEDred /PPFD LEDwhite = 1.5e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chinese cabbage”
e4“about 70%-proportion of the red component of the light spectrum (PPFD LEDred /PPFD LEDwhite = 1.5)”
Claim · model-written summary
The optimality criterion maximum was at a duty cycle with a period of 501 µs.
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensise0
- Outcome
- duty cyclee5
- Value
- 501 µse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chinese cabbage”
e5“the duty cycle with a period of 501 µs”
Claim · model-written summary
LED crop lighting with these parameters is optimal for high crop productivity and efficient energy use.
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensise0
- Outcome
- crop productivitye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chinese cabbage”
e6“LED crop lighting with these parameters was optimal for achieving high crop productivity and for efficient use of energy”
The same questions in other papers
light · yield · Brassica rapa (field mustard)Positive and negative results
8 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.