Abstract
Differences in soil physical, chemical and biological properties between paddy–upland and continuous upland rotations will influence nutrient relations and crop growth. With the aim of estimating rapeseed yield performance in response to fertilization in rice–rapeseed (RR) and cotton–rapeseed (CR) rotations, on-farm experiments were conducted at 70 sites across Hubei province, central China. The economically optimal fertilizer rates of winter oilseed rape in different rotations were determined. Field experiments showed that previous crops significantly influenced seed yields. Without N fertilization, seed yields were significantly lower for the RR rotation than for the CR rotation. The average yield increase ratio and agronomic efficiency associated with nitrogen (N) fertilization in the RR rotation were 96.6% and 6.56 kg kg− 1, significantly higher than those in the CR rotation. No seed yield differences were detected between the two rotations under phosphorus (P) and potassium (K) fertilization. In contrast to the CR rotation, N fertilizer played a more vital role in maintaining high seed yields in the RR rotation owing to the lower indigenous soil N supply. Compared with local N fertilizer recommendation rates for the RR rotation, on average an additional 18 kg N ha− 1 was recommended according to the economically optimal N fertilizer rate (EONFR). In contrast, the EONFR was 14 kg N ha− 1 lower than the locally recommended N fertilizer rate for the CR rotation. There were no differences between the two rotations for the average economically optimal P and K fertilization rates. Consequently, the average EONFR of winter oilseed rape could be reduced if cotton rather than rice preceded the winter oilseed rape.
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Claims 10
Claim · model-written summary
Previous crops significantly influenced seed yields of winter oilseed rape.
- Taxon
- winter oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- previous cropse1
- Outcome
- seed yieldse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“winter oilseed rape”
e1“Field experiments showed that previous crops significantly influenced seed yields”
Claim · model-written summary
Without N fertilization, seed yields were significantly lower in the rice-rapeseed rotation than in the cotton-rapeseed rotation.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- RR rotatione1
- Outcome
- seed yieldse1
- Direction
- lowere1
- Qualifier
- Without N fertilizatione1
- Comparator
- CR rotatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“Without N fertilization, seed yields were significantly lower for the RR rotation than for the CR rotation”
Claim · model-written summary
The average yield increase ratio from N fertilization in the rice-rapeseed rotation was 96.6%, significantly higher than in the cotton-rapeseed rotation.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- nitrogen (N) fertilizatione1
- Outcome
- yield increase ratioe1
- Direction
- highere1
- Value
- 96.6%e1
- Qualifier
- RR rotatione1
- Comparator
- CR rotatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“The average yield increase ratio and agronomic efficiency associated with nitrogen (N) fertilization in the RR rotation were 96.6% and 6.56 kg kg− 1, significantly higher than those in the CR rotation”
Claim · model-written summary
The average agronomic efficiency of N fertilization in the rice-rapeseed rotation was 6.56 kg kg-1, significantly higher than in the cotton-rapeseed rotation.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- nitrogen (N) fertilizatione1
- Outcome
- agronomic efficiencye1
- Direction
- highere1
- Value
- 6.56 kg kg− 1e1
- Qualifier
- RR rotatione1
- Comparator
- CR rotatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“The average yield increase ratio and agronomic efficiency associated with nitrogen (N) fertilization in the RR rotation were 96.6% and 6.56 kg kg− 1, significantly higher than those in the CR rotation”
Claim · model-written summary
Seed yield did not differ between the two rotations under phosphorus and potassium fertilization.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- phosphorus (P) and potassium (K) fertilizatione1
- Outcome
- seed yielde1
- Direction
- no_changeinferrede1
- Comparator
- the two rotationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“No seed yield differences were detected between the two rotations under phosphorus (P) and potassium (K) fertilization”
Claim · model-written summary
Because of the lower indigenous soil N supply, N fertilizer played a more vital role in maintaining high seed yields in the rice-rapeseed rotation than in the cotton-rapeseed rotation.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N fertilizere1
- Outcome
- maintaining high seed yieldse1
- Qualifier
- lower indigenous soil N supplye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“N fertilizer played a more vital role in maintaining high seed yields in the RR rotation owing to the lower indigenous soil N supply”
Claim · model-written summary
For the rice-rapeseed rotation, an additional 18 kg N per ha was recommended relative to local recommendations, based on the economically optimal N fertilizer rate.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- N fertilizer recommendatione1
- Value
- 18 kg N ha− 1e1
- Comparator
- local N fertilizer recommendation ratese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“Compared with local N fertilizer recommendation rates for the RR rotation, on average an additional 18 kg N ha− 1 was recommended according to the economically optimal N fertilizer rate (EONFR)”
Claim · model-written summary
For the cotton-rapeseed rotation, the economically optimal N fertilizer rate was 14 kg N per ha lower than the locally recommended rate.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- EONFRe1
- Direction
- lowere1
- Value
- 14 kg N ha− 1e1
- Qualifier
- CR rotatione1
- Comparator
- locally recommended N fertilizer ratee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“In contrast, the EONFR was 14 kg N ha− 1 lower than the locally recommended N fertilizer rate for the CR rotation”
Claim · model-written summary
The average economically optimal P and K fertilization rates did not differ between the two rotations.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- average economically optimal P and K fertilization ratese1
- Qualifier
- no differences between the two rotationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“There were no differences between the two rotations for the average economically optimal P and K fertilization rates”
Claim · model-written summary
The average economically optimal N rate of winter oilseed rape could be reduced if cotton rather than rice preceded it.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- average EONFRe1
- Direction
- reducede1
- Qualifier
- if cotton rather than rice preceded the winter oilseed rapee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter oilseed rape”
e1“the average EONFR of winter oilseed rape could be reduced if cotton rather than rice preceded the winter oilseed rape”
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