Abstract
The study aimed to establish whether a high onion yield and good storage performance could be obtained with low fertilisation rates if irrigation was applied when necessary. Two-year experiments investigated the effects of three NPK fertiliser levels (N 50, 100, 125/150 kg/ha), with and without irrigation, on yield, advancement of maturity, storage losses and shelf life. High fertilisation advanced maturity but irrigation had no effect. High fertilisation increased yield only in 1996 (5B7%), but irrigation increased the yield noticeably: by 33.5% in 1995 and 8.5% in 1996. There was no interaction between fertilisation and irrigation. The low fertilisation optimum is attributed to the mineralisation of soil nitrogen, as the soil was rich in organic matter. At the low fertilisation level, plants took up twice as much nitrogen as present in the fertiliser, and with increased fertilisation the nitrogen uptake increased markedly. The foliage nitrogen content was low, evidently as a result of late harvesting. Treatments had only a minor effect on the storage performance and shelf life of onions. The results suggest that fertilisation rates could be reduced in onion production. Irrigation during warm and dry periods is essential to achieve the maximum yield potential and does not impair the storage quality of onions.;
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Claims 13
Claim · model-written summary
High fertilisation advanced onion maturity.
- Taxon
- onions
Allium cepat0 - Treatment
- High fertilisatione0
- Outcome
- maturitye0
- Direction
- advancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High fertilisation advanced maturity but irrigation had no effect.”
t0“onions”
Claim · model-written summary
Irrigation had no effect on maturity.
- Taxon
- onionsAllium cepat0
- Treatment
- irrigatione0
- Outcome
- maturitye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High fertilisation advanced maturity but irrigation had no effect.”
t0“onions”
Claim · model-written summary
High fertilisation increased yield only in 1996, by the reported 5B7%.
- Taxon
- onionsAllium cepat0
- Treatment
- High fertilisatione0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 5B7%e0
- Qualifier
- only in 1996e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High fertilisation increased yield only in 1996 (5B7%)”
t0“onions”
Claim · model-written summary
Irrigation increased yield by 33.5% in 1995.
- Taxon
- onionsAllium cepat0
- Treatment
- irrigatione0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 33.5%e0
- Qualifier
- in 1995e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation increased the yield noticeably: by 33.5% in 1995 and 8.5% in 1996.”
t0“onions”
Claim · model-written summary
Irrigation increased yield by 8.5% in 1996.
- Taxon
- onionsAllium cepat0
- Treatment
- irrigatione0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 8.5%e0
- Qualifier
- in 1996e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation increased the yield noticeably: by 33.5% in 1995 and 8.5% in 1996.”
t0“onions”
Claim · model-written summary
Fertilisation and irrigation showed no interaction.
- Taxon
- onionsAllium cepat0
- Outcome
- interaction between fertilisation and irrigatione0
- Direction
- no interactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no interaction between fertilisation and irrigation.”
t0“onions”
Claim · model-written summary
Low fertilisation optimum was attributed to soil nitrogen mineralisation.
- Taxon
- onionsAllium cepat0
- Outcome
- low fertilisation optimume0
- Qualifier
- mineralisation of soil nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The low fertilisation optimum is attributed to the mineralisation of soil nitrogen, as the soil was rich in organic matter.”
t0“onions”
Claim · model-written summary
At low fertilisation, onions took up twice the nitrogen present in fertiliser.
- Taxon
- onionsAllium cepat0
- Treatment
- low fertilisation levele0
- Outcome
- nitrogene0
- Direction
- twice as muche0
- Value
- twice as much nitrogen as present in the fertilisere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the low fertilisation level, plants took up twice as much nitrogen as present in the fertiliser”
t0“onions”
Claim · model-written summary
Increased fertilisation markedly increased nitrogen uptake.
- Taxon
- onionsAllium cepat0
- Treatment
- increased fertilisatione0
- Outcome
- nitrogen uptakee0
- Direction
- increased markedlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with increased fertilisation the nitrogen uptake increased markedly.”
t0“onions”
Claim · model-written summary
Foliage nitrogen content was low, attributed to late harvesting.
- Taxon
- onionsAllium cepat0
- Organ / stage
- foliagee0
- Outcome
- nitrogen contente0
- Direction
- lowe0
- Qualifier
- late harvestinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The foliage nitrogen content was low, evidently as a result of late harvesting.”
t0“onions”
Claim · model-written summary
Treatments had minor effects on onion storage performance and shelf life.
- Taxon
- onionsAllium cepae0
- Treatment
- Treatmentse0
- Outcome
- storage performance and shelf lifee0
- Direction
- minor effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments had only a minor effect on the storage performance and shelf life of onions.”
Claim · model-written summary
Authors suggested reduced fertilisation rates for onion production.
- Taxon
- onionAllium cepae0
- Outcome
- fertilisation rates could be reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest that fertilisation rates could be reduced in onion production.”
Claim · model-written summary
Authors recommended irrigation in warm, dry periods to maximize yield without harming storage quality.
- Taxon
- onionsAllium cepae0
- Outcome
- Irrigation during warm and dry periods is essential to achieve the maximum yield potential and does not impair the storage qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation during warm and dry periods is essential to achieve the maximum yield potential and does not impair the storage quality of onions.”
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