Abstract
With global warming, the winter oilseed rape planting area in Northwest China is gradually increasing. It is vital to address the problems faced by winter oilseed rape cultivation in this region, such as low winter temperature, water shortage and low resources utilization efficiency. To explore the coupling effects of supplementary irrigation level and nitrogen (N) application rate on winter oilseed rape growth, water and N use efficiency, and determine the multi-objective optimal water-N management strategies, a two-year field experiment was conducted (2020–2021 and 2021–2022). The experiments included three supplementary irrigation levels (I0: rainfed; I1: supplementary irrigation at overwintering stage; I2: supplementary irrigation at overwintering and budding stages) and five N application rates (N0: 0 kg/hm2; N1: 120 kg/hm2; N2: 200 kg/hm2; N3: 280 kg/hm2; N4: 360 kg/hm2). The results showed that supplementary irrigation at overwintering and budding stages (I2) can improve the physiological growth indexes, N accumulation and utilization, main quality indexes, and yield of winter oilseed rape. Under I2, LAI, aboveground biomass, chlorophyll content, water use efficiency, N accumulation, N agronomy efficiency and yield of winter oilseed rape first increased and then decreased as N application rate increased, and all reached maximized at medium levels of N application rate (N2 or N3). Under the same irrigation level, the oil content of grain decreased as N application rate increased, while the protein and thioside acid content increased. Based on the TOPSIS with Nash equilibrium-combination weighting method, the multi-objective optimal strategies were determined to be the combination of supplementary irrigation at overwintering and budding stages (I2) and N application rate of 200 kg/hm2 (N2). This method overcomes the limitations of subjective and objective weighting methods, and made the evaluation results more reasonable. The finding can provide a reference for the application of water and N application in winter oilseed rape production in semi-arid areas of Northwest China and other regions with similar environments.
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Claims 9
Claim · model-written summary
Supplementary irrigation at overwintering and budding stages improved physiological growth indexes and N accumulation and utilization of winter oilseed rape
- Taxon
- winter oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- supplementary irrigation at overwintering and budding stages (I2)e1
- Outcome
- physiological growth indexes, N accumulation and utilizatione1
- Direction
- improvee1
- Setting
- Northwest Chinat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“winter oilseed rape production in Northwest China”
e1“supplementary irrigation at overwintering and budding stages (I2) can improve the physiological growth indexes, N accumulation and utilization, main quality indexes, and yield of winter oilseed rape”
Claim · model-written summary
Supplementary irrigation at overwintering and budding stages improved main quality indexes and yield of winter oilseed rape
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- supplementary irrigation at overwintering and budding stages (I2)e1
- Outcome
- main quality indexes, and yielde1
- Direction
- improvee1
- Setting
- Northwest Chinat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape production in Northwest China”
e1“supplementary irrigation at overwintering and budding stages (I2) can improve the physiological growth indexes, N accumulation and utilization, main quality indexes, and yield of winter oilseed rape”
Claim · model-written summary
Under supplementary irrigation at I2, LAI, aboveground biomass and chlorophyll content first increased and then decreased as N application rate increased, reaching maximum at medium N rates
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N application ratee2
- Outcome
- LAI, aboveground biomass, chlorophyll contente2
- Direction
- first increased and then decreasede2
- Qualifier
- reached maximized at medium levels of N application rate (N2 or N3)e2
- Setting
- Northwest Chinat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape production in Northwest China”
e2“Under I2, LAI, aboveground biomass, chlorophyll content, water use efficiency, N accumulation, N agronomy efficiency and yield of winter oilseed rape first increased and then decreased as N application rate increased, and all reached maximized at medium levels of N application rate (N2 or N3)”
Claim · model-written summary
Under supplementary irrigation at I2, water use efficiency, N accumulation and N agronomy efficiency first increased and then decreased as N application rate increased, reaching maximum at medium N rates
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N application ratee2
- Outcome
- water use efficiency, N accumulation, N agronomy efficiencye2
- Direction
- first increased and then decreasede2
- Qualifier
- reached maximized at medium levels of N application rate (N2 or N3)e2
- Setting
- Northwest Chinat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape production in Northwest China”
e2“Under I2, LAI, aboveground biomass, chlorophyll content, water use efficiency, N accumulation, N agronomy efficiency and yield of winter oilseed rape first increased and then decreased as N application rate increased, and all reached maximized at medium levels of N application rate (N2 or N3)”
Claim · model-written summary
Under supplementary irrigation at I2, yield of winter oilseed rape first increased and then decreased as N application rate increased, reaching maximum at medium N rates
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N application ratee2
- Outcome
- yielde2
- Direction
- first increased and then decreasede2
- Qualifier
- reached maximized at medium levels of N application rate (N2 or N3)e2
- Setting
- Northwest Chinat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape production in Northwest China”
e2“Under I2, LAI, aboveground biomass, chlorophyll content, water use efficiency, N accumulation, N agronomy efficiency and yield of winter oilseed rape first increased and then decreased as N application rate increased, and all reached maximized at medium levels of N application rate (N2 or N3)”
Claim · model-written summary
Under the same irrigation level, grain oil content of winter oilseed rape decreased as N application rate increased
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N application ratee3
- Outcome
- oil content of graine3
- Direction
- decreasede3
- Qualifier
- Under the same irrigation levele3
- Setting
- Northwest Chinat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape production in Northwest China”
e3“Under the same irrigation level, the oil content of grain decreased as N application rate increased, while the protein and thioside acid content increased”
Claim · model-written summary
Under the same irrigation level, protein and thioside acid content of winter oilseed rape increased as N application rate increased
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N application ratee3
- Outcome
- protein and thioside acid contente3
- Direction
- increasede3
- Qualifier
- Under the same irrigation levele3
- Setting
- Northwest Chinat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape production in Northwest China”
e3“Under the same irrigation level, the oil content of grain decreased as N application rate increased, while the protein and thioside acid content increased”
Claim · model-written summary
The multi-objective optimal water-N strategy was supplementary irrigation at overwintering and budding stages combined with 200 kg/hm2 N
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- supplementary irrigation at overwintering and budding stages (I2) and N application rate of 200 kg/hm2 (N2)e4
- Outcome
- multi-objective optimal strategiese4
- Value
- 200 kg/hm2e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape production in Northwest China”
e4“the multi-objective optimal strategies were determined to be the combination of supplementary irrigation at overwintering and budding stages (I2) and N application rate of 200 kg/hm2 (N2)”
Claim · model-written summary
The TOPSIS with Nash equilibrium-combination weighting method gave more reasonable evaluation results than subjective and objective weighting methods
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- evaluation resultse5
- Direction
- more reasonablee5
- Comparator
- subjective and objective weighting methodse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape production in Northwest China”
e5“This method overcomes the limitations of subjective and objective weighting methods, and made the evaluation results more reasonable”
The same questions in other papers
irrigation · growth · Brassica napus (oilseed rape)Positive and negative results
7 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- negative
7 papers more in this group
See all 11 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.