Abstract
This study was carried out under temperate climate condition of Khorasan province, Iran, during 2006-2008 growing seasons to determine the suitable crop rotation for enhancing nitrogen use efficiency of wheat. A three-factor experiment was laid out as splitsplit plot arrangement (RCBD) with three replications. Main plots were five preceding crops for wheat practices viz. wheat, potato, silage corn, clover and sugar beet. Sub plots were N fertilizer rates in preceding crop including no N (control), 50% lower than recommended N rate, recommended N rate and 50% more than recommended rate. The sub-sub plots were preceding crop residue return including no residue return (control) and 50% return. Results showed that nitrogen use efficiency (NUE), nitrogen uptake efficiency (NUpE), nitrogen utilization efficiency (NUtE), nitrogen harvest index (NHI) and grain protein content (GPC) in wheat were significantly affected by preceding crop. Fertilizer N rate applied on preceding crops, significantly influenced NUE, NUpE and grain protein content of wheat. NUE, NUpE, NUtE and NHI of wheat grown after potato recorded the highest values. While, the lowest NUE indices and grain protein content of wheat were found for wheat-wheat rotation. The higher NUE of wheat in the potatowheat rotation was due to the higher NUpE in this rotation. NUE and NUpE in all crop rotations reduced with increasing N fertilizer rate. Return of crop residue had no significant effect on NUE indices expect NHI.
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Claims 8
Claim · model-written summary
Preceding crop significantly affected five wheat nitrogen and protein indices.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- preceding crope0
- Outcome
- nitrogen use efficiency (NUE), nitrogen uptake efficiency (NUpE), nitrogen utilization efficiency (NUtE)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen use efficiency (NUE), nitrogen uptake efficiency (NUpE), nitrogen utilization efficiency (NUtE), nitrogen harvest index (NHI) and grain protein content (GPC) in wheat were significantly affected by preceding crop”
Claim · model-written summary
Fertilizer N rate significantly influenced wheat NUE, NUpE and grain protein.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Fertilizer N rate applied on preceding cropse0
- Outcome
- NUE, NUpE and grain protein contente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer N rate applied on preceding crops, significantly influenced NUE, NUpE and grain protein content of wheat”
Claim · model-written summary
Wheat after potato had highest NUE, NUpE and NUtE.
- Taxon
- wheatTriticum aestivume0
- Treatment
- after potatoe0
- Outcome
- NUE, NUpE, NUtEe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NUE, NUpE, NUtE and NHI of wheat grown after potato recorded the highest values”
Claim · model-written summary
Wheat after potato had highest NHI.
- Taxon
- wheatTriticum aestivume0
- Treatment
- after potatoe0
- Outcome
- NHIe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NUE, NUpE, NUtE and NHI of wheat grown after potato recorded the highest values”
Claim · model-written summary
Wheat-wheat rotation had lowest NUE indices and grain protein content.
- Taxon
- wheatTriticum aestivume0
- Treatment
- wheat-wheat rotatione0
- Outcome
- NUE indices and grain protein contente0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lowest NUE indices and grain protein content of wheat were found for wheat-wheat rotation”
Claim · model-written summary
Higher NUpE accounted for higher NUE in potato-wheat rotation.
- Taxon
- wheatTriticum aestivume0
- Outcome
- higher NUEe0
- Qualifier
- higher NUpEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher NUE of wheat in the potatowheat rotation was due to the higher NUpE in this rotation”
Claim · model-written summary
Increasing fertilizer N rate reduced NUE and NUpE across rotations.
Not reportedTaxonComparator
Verbatim
e0“NUE and NUpE in all crop rotations reduced with increasing N fertilizer rate”
t0“Wheat”
Claim · model-written summary
Residue return had no significant effect on NUE indices other than NHI.
- Treatment
- Return of crop residuee0
- Outcome
- NUE indicese0
- Direction
- no significant effecte0
- Qualifier
- expect NHIe0
Not reportedTaxonComparator
Verbatim
e0“Return of crop residue had no significant effect on NUE indices expect NHI”
t0“Wheat”
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