Abstract
The effect of different weed competition and weed-free periods on growth and yield of onion and weeds was investigated in two field experiments carried out at the University of Jordan Campus, Al-Jubeiha and at Jordan University Research Station located at the central Jordan Valley, during 1996/1997 growing season. Results showed that the longer the period that onion kept weed free or the earlier those weeds were removed from the crop after transplanting, the higher the onion growth and bulb yield obtained. The highest yield was obtained from the weed-free plots for the entire growing season. While no yield was obtained from weed-infested crop for the whole growing season at the Jordan Valley, bulb yield reduction was 86% in the same treatment at the University Campus experiment. Bulb yield was not significantly changed at 14 to 49 days of weed-infested crop at both locations. While none of the weed-free periods gave similar yield to that of the weed-free control in the Jordan Valley, weed-clean crop for only three weeks after transplanting at the University Campus location significantly increased bulb yield over the weed-infested control. In the Jordan Valley, weed competition for 14 days after transplanting significantly reduced bulb dry yield compared with the weed-free control. Results showed that weed growth and development was much higher than that of onion plants especially under irrigation. Based on the dry bulb yield obtained, critical period of weed competition was at 50 days after onion transplanting at both locations. This however, depends on the competing weed species, their densities and growing of onion under irrigation or rainfed conditions.
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Claims 10
Claim · model-written summary
The longer onion was kept weed free or the earlier weeds were removed after transplanting, the higher the onion growth and bulb yield.
- Taxon
- onion
Allium cepae1 - Treatment
- weed freee1
- Outcome
- bulb yielde1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e1“the longer the period that onion kept weed free or the earlier those weeds were removed from the crop after transplanting, the higher the onion growth and bulb yield obtained”
Claim · model-written summary
The highest yield was obtained from the weed-free plots for the entire growing season.
- Taxon
- OnionAllium cepat0
- Treatment
- weed-free plots for the entire growing seasone2
- Outcome
- yielde2
- Direction
- higheste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e2“The highest yield was obtained from the weed-free plots for the entire growing season”
Claim · model-written summary
No yield was obtained from weed-infested onion for the whole growing season in the Jordan Valley.
- Taxon
- OnionAllium cepat0
- Treatment
- weed-infested crop for the whole growing seasone3
- Outcome
- yielde3
- Direction
- noe3
- Setting
- Jordan Valleye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e3“While no yield was obtained from weed-infested crop for the whole growing season at the Jordan Valley”
Claim · model-written summary
Bulb yield was reduced by 86% in weed-infested onion at the University Campus experiment.
- Taxon
- OnionAllium cepat0
- Treatment
- weed-infested crop for the whole growing seasone3
- Outcome
- bulb yielde4
- Direction
- reductione4
- Value
- 86%e4
- Setting
- University Campuse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e3“While no yield was obtained from weed-infested crop for the whole growing season at the Jordan Valley”
e4“bulb yield reduction was 86% in the same treatment at the University Campus experiment”
Claim · model-written summary
Bulb yield was not significantly changed by 14 to 49 days of weed-infested crop at both locations.
- Taxon
- OnionAllium cepat0
- Treatment
- 14 to 49 days of weed-infested crope5
- Outcome
- Bulb yielde5
- Direction
- not significantly changede5
- Setting
- both locationse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e5“Bulb yield was not significantly changed at 14 to 49 days of weed-infested crop at both locations”
Claim · model-written summary
No weed-free period gave yield similar to the weed-free control in the Jordan Valley.
- Taxon
- OnionAllium cepat0
- Treatment
- weed-free periodse6
- Outcome
- yielde6
- Direction
- none of the weed-free periods gave similare6
- Comparator
- weed-free controle6
- Setting
- Jordan Valleye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e6“While none of the weed-free periods gave similar yield to that of the weed-free control in the Jordan Valley”
Claim · model-written summary
Weed-clean onion for three weeks after transplanting significantly increased bulb yield over the weed-infested control at the University Campus location.
- Taxon
- OnionAllium cepat0
- Treatment
- weed-clean crop for only three weeks after transplantinge7
- Outcome
- bulb yielde7
- Direction
- increasede7
- Comparator
- weed-infested controle7
- Setting
- University Campus locatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e7“weed-clean crop for only three weeks after transplanting at the University Campus location significantly increased bulb yield over the weed-infested control”
Claim · model-written summary
Weed competition for 14 days after transplanting significantly reduced bulb dry yield compared with the weed-free control in the Jordan Valley.
- Taxon
- OnionAllium cepat0
- Treatment
- weed competition for 14 days after transplantinge7
- Outcome
- bulb dry yielde7
- Direction
- reducede7
- Comparator
- weed-free controle7
- Setting
- Jordan Valleye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e7“In the Jordan Valley, weed competition for 14 days after transplanting significantly reduced bulb dry yield compared with the weed-free control”
Claim · model-written summary
Weed growth and development was much higher than that of onion plants, especially under irrigation.
- Taxon
- onionAllium cepae7
- Treatment
- irrigatione7
- Interactor
- weede7weed
- Outcome
- weed growth and developmente7
- Direction
- highere7
- Comparator
- onion plantse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e7“weed growth and development was much higher than that of onion plants especially under irrigation”
Claim · model-written summary
The critical period of weed competition in onion was 50 days after transplanting at both locations.
- Taxon
- onionAllium cepae1
- Outcome
- critical period of weed competitione1
- Value
- 50 dayse1
- Qualifier
- depends on the competing weed species, their densities and growing of onion under irrigation or rainfed conditionse2
- Setting
- both locationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Critical Period of Weed Competition in Onion (Allium cepa L.) in Jordan”
e1“critical period of weed competition was at 50 days after onion transplanting at both locations”
e2“This however, depends on the competing weed species, their densities and growing of onion under irrigation or rainfed conditions”
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61 papers in the same direction as this paper · 7 in the opposite direction · 2 reporting no difference from an alternative
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See all 71 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.