Abstract
To limit the environmental pollution associated with intensive nitrogen (N) fertilizer usage, alternative cultural practices must be considered for crops requiring high N inputs such as rapeseed. In this context, the effects of silicon (Si) supply on the agronomic performance of rapeseed cultivated under field conditions with two N fertilizer levels (60 and 160 kg ha−1) were studied. Results showed that Si supplied in the form of silicic acid (12 kg ha−1) has no effect on the agronomic performance of plants cultivated with the lower N input. In contrast, in plants fertilized with 160 kg N ha−1, Si supply promotes the preservation of green leaves (until the flowering stage) and at harvest stage, increases biomass, yield, and seed micronutrient concentrations (especially cobalt and iron). The agronomic indexes show that the increase in seed yield is related to a better uptake of N from the soil by Si-treated plants, but is not an improvement in N mobilization towards the seeds. This study showed that Si supply combined with high N inputs (160 kg ha−1) improves usage of N fertilizer and yield. The possibility that a Si supply could allow for a reduction in N input without altering the yield of rapeseed is discussed.
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Claims 8
Claim · model-written summary
Silicon had no effect on agronomic performance at lower nitrogen input.
- Taxon
- rapeseede1
- Treatment
- Si supplied in the form of silicic acid (12 kg ha−1)e0
- Outcome
- agronomic performancee0
- Direction
- no effecte0
- Qualifier
- lower N inpute0
- Setting
- field conditionse1
Not reportedComparator
Verbatim
e0“Si supplied in the form of silicic acid (12 kg ha−1) has no effect on the agronomic performance of plants cultivated with the lower N input”
e1“rapeseed cultivated under field conditions with two N fertilizer levels (60 and 160 kg ha−1)”
Claim · model-written summary
At high nitrogen input, silicon preserved green leaves through flowering.
- Taxon
- rapeseede1
- Organ / stage
- flowering stagee0
- Treatment
- Si supplye0
- Outcome
- preservation of green leavese0
- Direction
- promotese0
- Qualifier
- in plants fertilized with 160 kg N ha−1e0
Not reportedComparator
Verbatim
e0“in plants fertilized with 160 kg N ha−1, Si supply promotes the preservation of green leaves (until the flowering stage)”
e1“rapeseed cultivated under field conditions”
Claim · model-written summary
Silicon increased biomass at high nitrogen input.
- Taxon
- rapeseede1
- Treatment
- Si supplye0
- Outcome
- biomasse0
- Direction
- increasese0
- Qualifier
- in plants fertilized with 160 kg N ha−1e0
Not reportedComparator
Verbatim
e0“in plants fertilized with 160 kg N ha−1, Si supply promotes the preservation of green leaves (until the flowering stage) and at harvest stage, increases biomass, yield, and seed micronutrient concentrations (especially cobalt and iron)”
e1“rapeseed cultivated under field conditions”
Claim · model-written summary
Silicon increased yield at high nitrogen input.
- Taxon
- rapeseede1
- Treatment
- Si supplye0
- Outcome
- yielde0
- Direction
- increasese0
- Qualifier
- in plants fertilized with 160 kg N ha−1e0
Not reportedComparator
Verbatim
e0“in plants fertilized with 160 kg N ha−1, Si supply promotes the preservation of green leaves (until the flowering stage) and at harvest stage, increases biomass, yield, and seed micronutrient concentrations (especially cobalt and iron)”
e1“rapeseed cultivated under field conditions”
Claim · model-written summary
Silicon increased seed micronutrient concentrations at high nitrogen input.
- Taxon
- rapeseede1
- Treatment
- Si supplye0
- Outcome
- seed micronutrient concentrationse0
- Direction
- increasese0
- Qualifier
- in plants fertilized with 160 kg N ha−1e0
Not reportedComparator
Verbatim
e0“in plants fertilized with 160 kg N ha−1, Si supply promotes the preservation of green leaves (until the flowering stage) and at harvest stage, increases biomass, yield, and seed micronutrient concentrations (especially cobalt and iron)”
e1“rapeseed cultivated under field conditions”
Claim · model-written summary
The yield increase was related to better nitrogen uptake from soil.
Verbatim
e0“the increase in seed yield is related to a better uptake of N from the soil by Si-treated plants”
e1“rapeseed cultivated under field conditions”
Claim · model-written summary
Silicon did not improve nitrogen mobilization toward seeds.
- Taxon
- rapeseede2
- Treatment
- Si-treatede1
- Outcome
- N mobilization towards the seedse0
- Direction
- not an improvemente0
Not reportedComparator
Verbatim
e0“not an improvement in N mobilization towards the seeds”
e1“Si-treated plants”
e2“rapeseed cultivated under field conditions”
Claim · model-written summary
Silicon with high nitrogen input improved nitrogen fertilizer use.
- Taxon
- rapeseede1
- Treatment
- Si supply combined with high N inputs (160 kg ha−1)e0
- Outcome
- usage of N fertilizere0
- Direction
- improvese0
Not reportedComparator
Verbatim
e0“Si supply combined with high N inputs (160 kg ha−1) improves usage of N fertilizer and yield”
e1“rapeseed cultivated under field conditions”
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