Abstract
The critical period for weed control (CPWC) is the period in the crop growth cycle during which weeds must be controlled to prevent unacceptable yield losses. A field research was conducted in 2007 in Ardabil, Iran, to evaluate the effect of nitrogen rates on critical period for weed control in potato. Nitrogen fertilizer was applied at rates equivalent to 0, 100 and 200 kg N ha -1 . A quantitative series of treatments of both increasing duration of weed interference and length of weed-free period (0, 20, 40, 60 and 80 DAE) were imposed within each nitrogen main plot. Application of 200 kg N ha -1 reduced weed density and increased weed dry mass compared with non-application of nitrogen. Results showed that the addition of 100 kg N ha -1 delayed the beginning of the CPWC in potato when compared with the 0 and 200 kg N ha -1 . The duration of CPWC in potato also decreased when 100 kg N ha -1 was applied. Maximum values for potato yield was recorded in weed free plots and100 kg N ha -1 . Practical implications of this study are that 100 kg N ha -1 could have been improving potato compatibility for weed control more than 0 and 200 kg N ha -1 .
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Claims 6
Claim · model-written summary
200 kg N ha -1 reduced weed density.
- Taxon
- POTATO
Solanum tuberosumt0 - Treatment
- 200 kg N ha -1e0
- Interactor
- weede0weed
- Outcome
- weed densitye0
- Direction
- reducede0
- Comparator
- non-application of nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 200 kg N ha -1 reduced weed density and increased weed dry mass compared with non-application of nitrogen.”
t0“POTATO”
Claim · model-written summary
200 kg N ha -1 increased weed dry mass.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- 200 kg N ha -1e0
- Interactor
- weede0weed
- Outcome
- weed dry masse0
- Direction
- increasede0
- Comparator
- non-application of nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 200 kg N ha -1 reduced weed density and increased weed dry mass compared with non-application of nitrogen.”
t0“POTATO”
Claim · model-written summary
100 kg N ha -1 delayed the start of the critical period versus 0 and 200 kg N ha -1.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- 100 kg N ha -1e0
- Outcome
- beginning of the CPWCe0
- Direction
- delayede0
- Comparator
- 0 and 200 kg N ha -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that the addition of 100 kg N ha -1 delayed the beginning of the CPWC in potato when compared with the 0 and 200 kg N ha -1 .”
Claim · model-written summary
100 kg N ha -1 decreased the critical-period duration.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- 100 kg N ha -1e0
- Outcome
- duration of CPWCe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The duration of CPWC in potato also decreased when 100 kg N ha -1 was applied.”
Claim · model-written summary
Potato yield was highest in weed-free plots at 100 kg N ha -1.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- weed free plots and100 kg N ha -1e0
- Outcome
- potato yielde0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum values for potato yield was recorded in weed free plots and100 kg N ha -1 .”
Claim · model-written summary
Authors concluded 100 kg N ha -1 could improve potato compatibility for weed control versus 0 and 200 kg N ha -1.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- 100 kg N ha -1e0
- Outcome
- improving potato compatibility for weed controle0
- Comparator
- 0 and 200 kg N ha -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Practical implications of this study are that 100 kg N ha -1 could have been improving potato compatibility for weed control more than 0 and 200 kg N ha -1 .”
The same questions in other papers
herbicide · yield · Solanum tuberosum (potato)Results differ
39 papers in the same direction as this paper · 18 in the opposite direction · 3 reporting no difference from an alternative
- negative
- negative
- negative
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See all 61 papers →nitrogen · yield · Solanum tuberosum (potato)Results differ
108 papers in the same direction as this paper · 20 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- negative
- negative
128 papers more in this group
See all 132 papers →nitrogen · weed · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
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.