Abstract
The broad objective of this study was to test Deficit Irrigation (DI) as an appropriate irrigation management strategy to improve crop water productivity and give optimum onion crop yield. A field trial was conducted with drip irrigation system of six irrigation treatments replicated three times in a randomized complete block design. The crop was subjected to six water stress levels 100% ETc (T100), 90% ETc (T90), 80% ETc (T80), 70% ETc (T70), 60% ETc (T60) and 50% ETc (T50) at vegetative and late season growth stages. The onion yield and quality based on physical characteristics and irrigation water use efficiency were determined. The results indicated that the variation in yield ranged from 34.4 ton/ha to 18.9 ton/ha and the bulb size ranged from 64 mm to 35 mm in diameter for T100 and T50 respectively. Irrigation water use efficiency values decreased with increasing water application level with the highest of 16.2 kg/ha/mm at T50, and the lowest being13.1 kg/ha/mm at T100. It was concluded that DI at vegetative and late growth stages influence yields in a positive linear trend with increasing quantity of irrigation water and decreasing water stress reaching optimum yield of 32.0 ton/ha at 20% water stress (T80) thereby saving 10.7% irrigation water. Onion bulb production at this level optimizes water productivity without significantly affecting yields. DI influenced the size and size distribution of fresh onion bulbs, with low size variation of the fresh bulbs at T80.
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Claims 8
Claim · model-written summary
Onion yield ranged from 34.4 ton/ha at T100 to 18.9 ton/ha at T50.
- Taxon
- onion
Allium cepat0 - Treatment
- T100e0
- Outcome
- yielde0
- Value
- 34.4 ton/hae0
- Qualifier
- 18.9 ton/hae0
- Comparator
- T50e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the variation in yield ranged from 34.4 ton/ha to 18.9 ton/ha and the bulb size ranged from 64 mm to 35 mm in diameter for T100 and T50 respectively.”
t0“Onion Crop”
Claim · model-written summary
Onion bulb diameter ranged from 64 mm at T100 to 35 mm at T50.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the variation in yield ranged from 34.4 ton/ha to 18.9 ton/ha and the bulb size ranged from 64 mm to 35 mm in diameter for T100 and T50 respectively.”
t0“Onion Crop”
Claim · model-written summary
Irrigation water use efficiency fell as water application increased.
- Taxon
- onionAllium cepat0
- Treatment
- increasing water application levele0
- Outcome
- Irrigation water use efficiencye0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation water use efficiency values decreased with increasing water application level with the highest of 16.2 kg/ha/mm at T50, and the lowest being13.1 kg/ha/mm at T100.”
t0“Onion Crop”
Claim · model-written summary
T50 had the highest water use efficiency of 16.2 kg/ha/mm.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest of 16.2 kg/ha/mm at T50, and the lowest being13.1 kg/ha/mm at T100.”
t0“Onion Crop”
Claim · model-written summary
T100 had the lowest water use efficiency of 13.1 kg/ha/mm.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest of 16.2 kg/ha/mm at T50, and the lowest being13.1 kg/ha/mm at T100.”
t0“Onion Crop”
Claim · model-written summary
T80 produced 32.0 ton/ha at 20% water stress while saving 10.7% irrigation water.
- Taxon
- onionAllium cepat0
- Treatment
- 20% water stress (T80)e0
- Outcome
- optimum yielde0
- Direction
- optimume0
- Value
- 32.0 ton/hae0
- Qualifier
- saving 10.7% irrigation watere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reaching optimum yield of 32.0 ton/ha at 20% water stress (T80) thereby saving 10.7% irrigation water.”
t0“Onion Crop”
Claim · model-written summary
At T80 water productivity was optimized without a significant yield reduction.
- Taxon
- OnionAllium cepae0
- Treatment
- this levele0
- Outcome
- water productivitye0
- Direction
- optimizese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onion bulb production at this level optimizes water productivity without significantly affecting yields.”
Claim · model-written summary
Deficit irrigation influenced fresh bulb size and size distribution, with low size variation at T80.
- Taxon
- onionAllium cepae0
- Treatment
- DIe0
- Outcome
- size and size distribution of fresh onion bulbse0
- Qualifier
- low size variation of the fresh bulbs at T80e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DI influenced the size and size distribution of fresh onion bulbs, with low size variation of the fresh bulbs at T80.”
The same questions in other papers
drought · yield · Allium cepa (onion)Positive and negative results
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See all 17 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.