Abstract
Floating row covers are important pre-harvest factors for maximizing the yield of vegetable crops grown under open-field conditions. It is necessary to replace oil-based nonwoven covers with biodegradable ones that are environmentally friendly. The aim of this study was to investigate the effects of biodegradable nonwoven covers, made of aliphatic-aromatic copolyesters, with or without fatty acid dimers (SB20/13, SB21/13, and SB28/13), on yield and chemical composition of ‘Glacier’ and ‘Swift’ winter onions. In the first experiment, we observed a higher total marketable yield and higher harvest index for onions covered with SB21/13 (by 24% and 3%, respectively) when compared to the control (polypropylene nonwoven). The SB20/13 cover significantly decreased mean bulb weight by 15.3% than in control. Bulbs harvested from the plots covered with SB21/13 had lower dry weight by 3.2-3.7% and those covered with SB28/13 showed the lowest L-ascorbic acid content when compared to all other treatments (by 6.3-10.3%). The lowest total sugar content was found in control onion bulbs, but it was significantly different only from bulbs covered by SB20/13, which had more sugar by 10.6%. In the second experiment, plants covered with the SB28/13 had a 1 st grade yield of onions higher by 47% than that of the control. The highest mean bulb weight was obtained from plants covered with the SB21/13 nonwoven. Covering with nonwovens caused a decrease in dry weight (SB20/13 and SB21/13, by 1.3-1.7%, respectively) and L-ascorbic acid (all nonwovens, by 15.6% for SB21/13 up to 22% for SB20/13) in onion bulbs in comparison to the control. Since the tested biodegradable nonwovens covers did not cause any decrease in the yield of winter onions compared to polypropylene nonwovens, the former appear to be a suitable environmental-friendly solution for the open-field cultivation of this important vegetable crop.
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Claims 13
Claim · model-written summary
SB21/13 increased marketable onion yield by 24% in experiment one.
- Taxon
- onion
Allium cepat0 - Treatment
- SB21/13e0
- Outcome
- total marketable yielde0
- Direction
- highere0
- Value
- 24%e0
- Comparator
- control (polypropylene nonwoven)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the first experiment, we observed a higher total marketable yield and higher harvest index for onions covered with SB21/13 (by 24% and 3%, respectively) when compared to the control (polypropylene nonwoven).”
t0“overwintering onion”
Claim · model-written summary
SB21/13 increased onion harvest index by 3% in experiment one.
- Taxon
- onionAllium cepat0
- Treatment
- SB21/13e0
- Outcome
- harvest indexe0
- Direction
- highere0
- Value
- 3%e0
- Comparator
- control (polypropylene nonwoven)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the first experiment, we observed a higher total marketable yield and higher harvest index for onions covered with SB21/13 (by 24% and 3%, respectively) when compared to the control (polypropylene nonwoven).”
t0“overwintering onion”
Claim · model-written summary
SB20/13 decreased mean onion bulb weight by 15.3% relative to control.
- Taxon
- onionAllium cepat0
- Treatment
- SB20/13 covere0
- Outcome
- mean bulb weighte0
- Direction
- decreasede0
- Value
- 15.3%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SB20/13 cover significantly decreased mean bulb weight by 15.3% than in control.”
t0“overwintering onion”
Claim · model-written summary
SB21/13 produced onion bulbs with 3.2-3.7% lower dry weight.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bulbs harvested from the plots covered with SB21/13 had lower dry weight by 3.2-3.7% and those covered with SB28/13 showed the lowest L-ascorbic acid content when compared to all other treatments (by 6.3-10.3%).”
t0“overwintering onion”
Claim · model-written summary
SB28/13 produced the lowest bulb L-ascorbic acid content, 6.3-10.3% below other treatments.
- Taxon
- onionAllium cepat0
- Treatment
- SB28/13e0
- Outcome
- L-ascorbic acid contente0
- Direction
- loweste0
- Value
- 6.3-10.3%e0
- Comparator
- all other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bulbs harvested from the plots covered with SB21/13 had lower dry weight by 3.2-3.7% and those covered with SB28/13 showed the lowest L-ascorbic acid content when compared to all other treatments (by 6.3-10.3%).”
t0“overwintering onion”
Claim · model-written summary
SB20/13 onion bulbs contained 10.6% more sugar than controls.
- Taxon
- onionAllium cepat0
- Treatment
- SB20/13e0
- Outcome
- total sugar contente0
- Direction
- moree0
- Value
- 10.6%e0
- Comparator
- control onion bulbse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest total sugar content was found in control onion bulbs, but it was significantly different only from bulbs covered by SB20/13, which had more sugar by 10.6%.”
t0“overwintering onion”
Claim · model-written summary
SB28/13 raised first-grade onion yield by 47% in experiment two.
- Taxon
- onionAllium cepat0
- Treatment
- SB28/13e0
- Outcome
- 1 st grade yield of onionse0
- Direction
- highere0
- Value
- 47%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the second experiment, plants covered with the SB28/13 had a 1 st grade yield of onions higher by 47% than that of the control.”
t0“overwintering onion”
Claim · model-written summary
SB21/13 had the highest mean bulb weight in experiment two.
- Taxon
- onionAllium cepat0
- Treatment
- SB21/13 nonwovene0
- Outcome
- mean bulb weighte0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest mean bulb weight was obtained from plants covered with the SB21/13 nonwoven.”
t0“overwintering onion”
Claim · model-written summary
SB20/13 reduced onion bulb dry weight in experiment two.
- Taxon
- onionAllium cepat0
- Treatment
- SB20/13e0
- Outcome
- dry weighte0
- Direction
- decreasee0
- Value
- 1.3-1.7%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Covering with nonwovens caused a decrease in dry weight (SB20/13 and SB21/13, by 1.3-1.7%, respectively) and L-ascorbic acid (all nonwovens, by 15.6% for SB21/13 up to 22% for SB20/13) in onion bulbs in comparison to the control.”
t0“overwintering onion”
Claim · model-written summary
SB21/13 reduced onion bulb dry weight in experiment two.
- Taxon
- onionAllium cepat0
- Treatment
- SB21/13e0
- Outcome
- dry weighte0
- Direction
- decreasee0
- Value
- 1.3-1.7%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Covering with nonwovens caused a decrease in dry weight (SB20/13 and SB21/13, by 1.3-1.7%, respectively) and L-ascorbic acid (all nonwovens, by 15.6% for SB21/13 up to 22% for SB20/13) in onion bulbs in comparison to the control.”
t0“overwintering onion”
Claim · model-written summary
SB21/13 reduced bulb L-ascorbic acid by 15.6%.
- Taxon
- onionAllium cepat0
- Treatment
- SB21/13e0
- Outcome
- L-ascorbic acide0
- Direction
- decreasee0
- Value
- 15.6%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Covering with nonwovens caused a decrease in dry weight (SB20/13 and SB21/13, by 1.3-1.7%, respectively) and L-ascorbic acid (all nonwovens, by 15.6% for SB21/13 up to 22% for SB20/13) in onion bulbs in comparison to the control.”
t0“overwintering onion”
Claim · model-written summary
SB20/13 reduced bulb L-ascorbic acid by 22%.
- Taxon
- onionAllium cepat0
- Treatment
- SB20/13e0
- Outcome
- L-ascorbic acide0
- Direction
- decreasee0
- Value
- 22%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Covering with nonwovens caused a decrease in dry weight (SB20/13 and SB21/13, by 1.3-1.7%, respectively) and L-ascorbic acid (all nonwovens, by 15.6% for SB21/13 up to 22% for SB20/13) in onion bulbs in comparison to the control.”
t0“overwintering onion”
Claim · model-written summary
The authors consider biodegradable nonwoven covers suitable for open-field winter onion cultivation because yield was not reduced relative to polypropylene.
- Taxon
- winter onionsAllium cepae0
- Treatment
- biodegradable nonwovens coverse0
- Outcome
- suitable environmental-friendly solutione0
- Comparator
- polypropylene nonwovense0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Since the tested biodegradable nonwovens covers did not cause any decrease in the yield of winter onions compared to polypropylene nonwovens, the former appear to be a suitable environmental-friendly solution for the open-field cultivation of this important vegetable crop.”