Abstract
Life cycle assessment is an appropriate method to study the environmental impacts of producing a crop plant throughout its production cycle. This research was conducted with the aim of evaluating the life cycle of irrigated wheat production under nitrogen amounts and splitting in Bushehr province during 2017-18The as split plots based on a randomized complete blocks design with four replications. Four nitrogen rates including 70, 140, 210 and 280 kg urea ha-1 was considered as main plots and three nitrogen splitting in basal, beginning of tillering, stem elongation and booting stages was chosen as sub plot.The results demonstrated that with increase of nitrogen application an amount of cumulative energy demand, cumulative energy demand, acidification, eutrophiction and malodorous air were decreased. The average amount of ecological footprint was 1125.87 m2 per year which CO2 emissions had shown the highest effect on the ecological footprint. The average amount of global warming potential (GWP) was 20a and GWP 500a were 400.53 and 384.30 kg CO2 eq, respectively. All pollutants released into the air and the water experienced a decreasing trend with increasing nitrogen rate. By group comparing between different levels of nitrogen at splitting levels, it can be stated that the main cause of variations in the amount of pollutants was the higher output (yield) compared to inputs. Indeed, nitrogen application in four developmental stages has resulted in maximum plant use, resulting in increased yield and emission reduction per unit area. Therefore, reducing the emission of pollutants by increasing nitrogen consumption can be due to yield increasing.
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Claims 8
Claim · model-written summary
Increasing nitrogen decreased cumulative energy demand, acidification, eutrophication, and malodorous air impacts.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- nitrogen applicatione0
- Outcome
- cumulative energy demand, cumulative energy demand, acidification, eutrophiction and malodorous aire0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with increase of nitrogen application an amount of cumulative energy demand, cumulative energy demand, acidification, eutrophiction and malodorous air were decreased.”
t0“Wheat”
Claim · model-written summary
Average ecological footprint was 1125.87 m2 per year.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- ecological footprinte0
- Value
- 1125.87 m2 per yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average amount of ecological footprint was 1125.87 m2 per year which CO2 emissions had shown the highest effect on the ecological footprint.”
t0“Wheat”
Claim · model-written summary
CO2 emissions had the highest contribution to ecological footprint.
- Taxon
- wheatTriticum aestivumt0
- Compound
- CO2 emissionse0
- Outcome
- effect on the ecological footprinte0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average amount of ecological footprint was 1125.87 m2 per year which CO2 emissions had shown the highest effect on the ecological footprint.”
t0“Wheat”
Claim · model-written summary
Average 20-year GWP was 400.53 kg CO2 eq.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- global warming potential (GWP)e0
- Value
- 400.53 and 384.30 kg CO2 eqe0
- Qualifier
- 20ae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average amount of global warming potential (GWP) was 20a and GWP 500a were 400.53 and 384.30 kg CO2 eq, respectively.”
t0“Wheat”
Claim · model-written summary
Increasing nitrogen reduced pollutants released to air and water.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- increasing nitrogen ratee0
- Outcome
- pollutants released into the air and the watere0
- Direction
- decreasing trende0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All pollutants released into the air and the water experienced a decreasing trend with increasing nitrogen rate.”
t0“Wheat”
Claim · model-written summary
Variation in pollutant amounts across nitrogen and splitting levels was attributed to higher yield relative to inputs.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- variations in the amount of pollutantse0
- Qualifier
- higher output (yield) compared to inputse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the main cause of variations in the amount of pollutants was the higher output (yield) compared to inputs.”
t0“Wheat”
Claim · model-written summary
Nitrogen applied at four developmental stages increased yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- nitrogen application in four developmental stagese0
- Outcome
- yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen application in four developmental stages has resulted in maximum plant use, resulting in increased yield and emission reduction per unit area.”
t0“Wheat”
Claim · model-written summary
Nitrogen applied at four developmental stages reduced emissions per unit area.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- nitrogen application in four developmental stagese0
- Outcome
- emission reduction per unit areae0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen application in four developmental stages has resulted in maximum plant use, resulting in increased yield and emission reduction per unit area.”
t0“Wheat”
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