Abstract
Onion is an important vegetable crop commercially grown both by large and small scale farmers in Ethiopia. Its production is highly dependent on availability of high and good quality seed, which is constrained by a number of problems including declining soil fertility and inappropriate fertilizer application. A study was conducted to investigate the effects of nitrogen (N) and phosphorus (P) fertilizer rates on onion seed yield and quality. The experiment was conducted at Kulumsa, South East Ethiopia, using four levels of N (0, 50,100 and 150 kg N ha-1) and four levels of P (0, 35, 70 and 105 kg P2O5 ha-1) fertilizers arranged in 4 × 4 factorial arrangements in randomized complete block design with three replications. The result of the study revealed that almost all of the yield and yield component parameters considered were significantly affected by the treatments. The crop phenology, growth and yield components were significantly influenced by the rate of N and P fertilizers and their interactions. More specifically, seed yield and seed quality were significantly (P<0.01) varied among treatment combinations. The combination of N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1 gave the highest seed yield (1858.82 kg ha-1) with yield increment of about 57.72% over the control (no fertilizer application). As main factors each of N and P fertilizers at rates of 100 kg N ha-1 and 105 kg P2O5 ha-1 resulted in highest germination percentage of onion seed. Therefore, a combined application of N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1 rates can be recommended for onion seed producers in the study area and areas of similar agro-ecology. Key words: Soil fertility, commercial fertilizers, Alliaceae, Tri- super phosphate, Urea.
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Claims 7
Claim · model-written summary
Onion phenology, growth and yield components were significantly affected by N and P rates and interactions.
- Taxon
- Onion
Allium cepat0 - Treatment
- rate of N and P fertilizerse0
- Outcome
- crop phenology, growth and yield componentse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crop phenology, growth and yield components were significantly influenced by the rate of N and P fertilizers and their interactions”
t0“Onion”
Claim · model-written summary
Onion seed yield and quality varied significantly among treatment combinations.
- Taxon
- OnionAllium cepat0
- Treatment
- treatment combinationse0
- Outcome
- seed yield and seed qualitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed yield and seed quality were significantly (P<0.01) varied among treatment combinations”
t0“Onion”
Claim · model-written summary
N at 100 kg N ha-1 with P at 70 kg P2O5 ha-1 produced the highest onion seed yield, 1858.82 kg ha-1.
- Taxon
- OnionAllium cepat0
- Treatment
- N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1e0
- Outcome
- seed yielde0
- Direction
- higheste0
- Value
- 1858.82 kg ha-1e0
- Comparator
- controle0
- Setting
- Kulumsat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1 gave the highest seed yield (1858.82 kg ha-1) with yield increment of about 57.72% over the control (no fertilizer application)”
t0“Onion (Allium cepa L.) at Kulumsa”
Claim · model-written summary
The same N and P combination increased onion seed yield by about 57.72% over no fertilizer.
- Taxon
- OnionAllium cepat0
- Treatment
- N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1e0
- Outcome
- seed yielde0
- Direction
- incremente0
- Value
- 57.72%e0
- Comparator
- control (no fertilizer application)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1 gave the highest seed yield (1858.82 kg ha-1) with yield increment of about 57.72% over the control (no fertilizer application)”
t0“Onion”
Claim · model-written summary
N at 100 kg N ha-1 gave the highest onion seed germination percentage as a main factor.
- Taxon
- onionAllium cepae0
- Treatment
- N and P fertilizers at rates of 100 kg N ha-1e0
- Outcome
- germination percentage of onion seede0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As main factors each of N and P fertilizers at rates of 100 kg N ha-1 and 105 kg P2O5 ha-1 resulted in highest germination percentage of onion seed”
Claim · model-written summary
P at 105 kg P2O5 ha-1 gave the highest onion seed germination percentage as a main factor.
- Taxon
- onionAllium cepae0
- Treatment
- 105 kg P2O5 ha-1e0
- Outcome
- germination percentage of onion seede0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As main factors each of N and P fertilizers at rates of 100 kg N ha-1 and 105 kg P2O5 ha-1 resulted in highest germination percentage of onion seed”
Claim · model-written summary
The authors recommend N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1 for onion seed production in similar areas.
- Taxon
- onionAllium cepae0
- Outcome
- combined application of N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1 ratese0
- Qualifier
- study area and areas of similar agro-ecologye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a combined application of N at 100 kg N ha-1 and P at 70 kg P2O5 ha-1 rates can be recommended for onion seed producers in the study area and areas of similar agro-ecology”
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