Abstract
A field experiment was undertaken to study the effect of different levels of nitrogen (N) and phosphorus (P) fertilizers on the growth, biomass yield and fresh bulb yield of onion (Allium cepa L.) grown on vertisol of Shewa Robit, North east Ethiopia. Five rates of N (0, 69, 92, 115, 138 kg ha-1) and five rates of P (0, 10, 20, 30, 40 kg ha-1) were arranged in a Randomized Complete Block Design replicated three times. Nitrogen showed significant effects in all of the parameters studied, while P fertilization and its interaction with N did not. The proportion of bolters per plot decreased by about 11 and 22% in response to the application of 69 and 92 kg N ha-1, respectively over the control. Regardless of the rate, N fertilization day extended days to physiological maturity by about 6 days over the control. Application of 69 kg N ha-1increased plant height and leaf length by about 10 and 11.5%, respectively over the unfertilized check. Number of leaves increased by about 8% in response to the application of 92 kg N ha-1 over the control. Leaf diameter and bulb length were not influenced by N fertilization. Regardless of the rate of application, N fertilization increased bulb diameter and average bulb weight by about 12 and 21.5%, respectively over the control. Application of 69 kg N ha-1 increased the development of splitted bulbs by about 45%, average bulb weight by 24%, total dry biomass by 20%, harvest index by about 4%, total bulb yield by 18%, and marketable bulb yield by 17% over the control. Application of 69 kg N ha-1 enhanced the growth of onion plant and resulted in optimum fresh total and marketable bulb yield on the vertisol of Shewa Robit, North east Ethiopia. The lack of significant response in onion to P fertilization could be attributed to the presence of adequate amounts of available P (16.02 ppm) in the soil and hence P fertilization for onion production is not advisable. Key words: Bulb diameter, bulb splitting, neck thickness, onion bolting, onion maturity.
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Claims 20
Claim · model-written summary
Nitrogen significantly affected all studied onion parameters.
- Taxon
- onion
Allium cepat0 - Treatment
- Nitrogene0
- Outcome
- parameters studiede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen showed significant effects in all of the parameters studied, while P fertilization and its interaction with N did not”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
Phosphorus did not significantly affect studied onion parameters.
- Taxon
- onionAllium cepat0
- Treatment
- P fertilizatione0
- Outcome
- parameters studiede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen showed significant effects in all of the parameters studied, while P fertilization and its interaction with N did not”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
Nitrogen–phosphorus interaction did not significantly affect studied onion parameters.
- Taxon
- onionAllium cepat0
- Treatment
- interaction with Ne0
- Outcome
- parameters studiede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen showed significant effects in all of the parameters studied, while P fertilization and its interaction with N did not”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 decreased bolters per plot by 11.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e1
- Outcome
- bolters per plote0
- Direction
- decreasede0
- Value
- 11e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proportion of bolters per plot decreased by about 11 and 22% in response to the application of 69 and 92 kg N ha-1, respectively over the control”
t0“onion ( Allium cepa L.)”
e1“Application of 69 kg N ha-1increased plant height and leaf length by about 10 and 11.5%, respectively over the unfertilized check”
Claim · model-written summary
92 kg N ha-1 decreased bolters per plot by 22%.
- Taxon
- onionAllium cepat0
- Treatment
- 92 kg N ha-1e0
- Outcome
- bolters per plote0
- Direction
- decreasede0
- Value
- 22%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proportion of bolters per plot decreased by about 11 and 22% in response to the application of 69 and 92 kg N ha-1, respectively over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
N fertilization extended days to physiological maturity by about 6 days.
- Taxon
- onionAllium cepat0
- Treatment
- N fertilizatione0
- Outcome
- days to physiological maturitye0
- Direction
- extendede0
- Value
- about 6 dayse0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of the rate, N fertilization day extended days to physiological maturity by about 6 days over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 increased plant height by about 10.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- plant heighte0
- Direction
- increasede0
- Value
- about 10e0
- Comparator
- unfertilized checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1increased plant height and leaf length by about 10 and 11.5%, respectively over the unfertilized check”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 increased leaf length by 11.5%.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- leaf lengthe0
- Direction
- increasede0
- Value
- 11.5%e0
- Comparator
- unfertilized checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1increased plant height and leaf length by about 10 and 11.5%, respectively over the unfertilized check”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
92 kg N ha-1 increased Number of leaves by about 8%.
- Taxon
- onionAllium cepat0
- Treatment
- 92 kg N ha-1e0
- Outcome
- Number of leavese0
- Direction
- increasede0
- Value
- about 8%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Number of leaves increased by about 8% in response to the application of 92 kg N ha-1 over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
N fertilization not influenced Leaf diameter and bulb length.
- Taxon
- onionAllium cepat0
- Treatment
- N fertilizatione0
- Outcome
- Leaf diameter and bulb lengthe0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf diameter and bulb length were not influenced by N fertilization”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
N fertilization increased bulb diameter by about 12.
- Taxon
- onionAllium cepat0
- Treatment
- N fertilizatione0
- Outcome
- bulb diametere0
- Direction
- increasede0
- Value
- about 12e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of the rate of application, N fertilization increased bulb diameter and average bulb weight by about 12 and 21.5%, respectively over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
N fertilization increased average bulb weight by 21.5%.
- Taxon
- onionAllium cepat0
- Treatment
- N fertilizatione0
- Outcome
- average bulb weighte0
- Direction
- increasede0
- Value
- 21.5%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of the rate of application, N fertilization increased bulb diameter and average bulb weight by about 12 and 21.5%, respectively over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 increased splitted bulbs by about 45%.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- splitted bulbse0
- Direction
- increasede0
- Value
- about 45%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1 increased the development of splitted bulbs by about 45%, average bulb weight by 24%, total dry biomass by 20%, harvest index by about 4%, total bulb yield by 18%, and marketable bulb yield by 17% over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 increased average bulb weight by 24%.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- average bulb weighte0
- Direction
- increasede0
- Value
- 24%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1 increased the development of splitted bulbs by about 45%, average bulb weight by 24%, total dry biomass by 20%, harvest index by about 4%, total bulb yield by 18%, and marketable bulb yield by 17% over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 increased total dry biomass by 20%.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- total dry biomasse0
- Direction
- increasede0
- Value
- 20%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1 increased the development of splitted bulbs by about 45%, average bulb weight by 24%, total dry biomass by 20%, harvest index by about 4%, total bulb yield by 18%, and marketable bulb yield by 17% over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 increased harvest index by about 4%.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- harvest indexe0
- Direction
- increasede0
- Value
- about 4%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1 increased the development of splitted bulbs by about 45%, average bulb weight by 24%, total dry biomass by 20%, harvest index by about 4%, total bulb yield by 18%, and marketable bulb yield by 17% over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 increased total bulb yield by 18%.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- total bulb yielde0
- Direction
- increasede0
- Value
- 18%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1 increased the development of splitted bulbs by about 45%, average bulb weight by 24%, total dry biomass by 20%, harvest index by about 4%, total bulb yield by 18%, and marketable bulb yield by 17% over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
69 kg N ha-1 increased marketable bulb yield by 17%.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- marketable bulb yielde0
- Direction
- increasede0
- Value
- 17%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1 increased the development of splitted bulbs by about 45%, average bulb weight by 24%, total dry biomass by 20%, harvest index by about 4%, total bulb yield by 18%, and marketable bulb yield by 17% over the control”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
The authors judged 69 kg N ha-1 optimal for fresh bulb yield.
- Taxon
- onionAllium cepat0
- Treatment
- 69 kg N ha-1e0
- Outcome
- optimum fresh total and marketable bulb yielde0
- Setting
- Shewa Robit, North east Ethiopiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 69 kg N ha-1 enhanced the growth of onion plant and resulted in optimum fresh total and marketable bulb yield on the vertisol of Shewa Robit, North east Ethiopia”
t0“onion ( Allium cepa L.)”
Claim · model-written summary
The authors advised against phosphorus fertilization for onion production.
- Taxon
- onionAllium cepat0
- Outcome
- P fertilization for onion production is not advisablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P fertilization for onion production is not advisable”
t0“onion ( Allium cepa L.)”
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