Abstract
Introduction: Onion is an important cash crop for smallholder farmers in the Central Rift Valley of Ethiopia. However, the yield of the crop is low owing to a number of constraints out of which soil nutrient depletion and inappropriate soil fertility management practices are the most important ones. Methods and Materials: A field experiment was carried out for two consecutive years of 2011 and 2012 using irrigation at Melkassa, Central Rift Valley Region of Ethiopia, to assess the response of onion to different levels of nitrogen and phosphorus fertilizers and to identify economical rates of the fertilizers for optimizing the yield and quality of the crop. The treatments consisted of five levels of nitrogen (0, 34.5, 69, 103.5 and 138 kg ha -1 ) and four levels of phosphorus (0, 46, 92, and 138 kg P 2 O 5 ha -1 ). The experiment was carried out as a randomized complete block design in a factorial arrangement with three replications. Results: The results of the study revealed that the main effect of nitrogen significantly (P≤0.05) affected most of the growth parameters and bulb characters which all attained maximum values at 138 kg N ha -1 . The main effect of P significantly (P ≤ 0.05) influenced leaf number, leaf length, and bulb diameter. Nitrogen and phosphorus interacted to influence total and marketable bulb yields. Application of N at the rate of 103.5 kg N ha -1 combined with 138 kg ha -1 P 2 O 5 led to the production of the highest total and marketable bulb yield of onion. However, results of the economic analysis revealed that application of N at the rate of 103.5 kg ha -1 and P 2 O 5 at 92 kg ha -1 led to the highest net return.
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Claims 5
Claim · model-written summary
Nitrogen significantly affected most onion growth parameters and bulb characters, which peaked at 138 kg N ha -1.
- Taxon
- onion
Allium cepat0 - Treatment
- 138 kg N ha -1e0
- Outcome
- growth parameters and bulb characterse0
- Direction
- maximume0
Not reportedComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results of the study revealed that the main effect of nitrogen significantly (P≤0.05) affected most of the growth parameters and bulb characters which all attained maximum values at 138 kg N ha -1 .”
t0“Onion”
Claim · model-written summary
Phosphorus significantly influenced onion leaf number, leaf length and bulb diameter.
- Taxon
- onionAllium cepat0
- Treatment
- Pe0
- Outcome
- leaf number, leaf length, and bulb diametere0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The main effect of P significantly (P ≤ 0.05) influenced leaf number, leaf length, and bulb diameter.”
t0“Onion”
Claim · model-written summary
Nitrogen and phosphorus interacted in their effects on total and marketable onion bulb yields.
- Taxon
- onionAllium cepat0
- Treatment
- Nitrogen and phosphoruse0
- Outcome
- total and marketable bulb yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen and phosphorus interacted to influence total and marketable bulb yields.”
t0“Onion”
Claim · model-written summary
The highest total and marketable onion bulb yields occurred with 103.5 kg N ha -1 and 138 kg ha -1 P 2 O 5.
- Taxon
- onionAllium cepat0
- Treatment
- 103.5 kg N ha -1 combined with 138 kg ha -1 P 2 O 5e0
- Outcome
- total and marketable bulb yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of N at the rate of 103.5 kg N ha -1 combined with 138 kg ha -1 P 2 O 5 led to the production of the highest total and marketable bulb yield of onion.”
t0“Onion”
Claim · model-written summary
The highest net return came from 103.5 kg ha -1 N and 92 kg ha -1 P 2 O 5.
- Taxon
- onionAllium cepat0
- Treatment
- 103.5 kg ha -1 and P 2 O 5 at 92 kg ha -1e0
- Outcome
- net returne0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of N at the rate of 103.5 kg ha -1 and P 2 O 5 at 92 kg ha -1 led to the highest net return.”
t0“Onion”
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See all 41 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.