Abstract
Abstract Mineral fertilizer plays an important role in the maintenance of high rapeseed yields during oilseed rape (Brassica napus L.) production. On-farm experiments at 60 sites throughout the Yangtze River Basin in China were conducted for 2 years to evaluate the effects of the recommended fertilization rates (180 kg N ha−1, 90 kg P2O5 ha−1, and 120 kg K2O ha−1) on the rapeseed yield, and three indices of soil nutrient supply were adopted to estimate the yield responses to fertilizer recommendation. The results showed that the average contributions of nitrogen (N), phosphorus (P) and potassium (K) fertilizer to seed yield were 40.4, 23.1 and 11.5%, respectively. Compared with the farmers’ fertilization practices (FFP), the recommended fertilization significantly enhanced the seed yield by 29.1% on average. The relationships between plant-available soil nutrient supply, seed yields of the nutrient omission treatments and the yield responses to fertilization were significant, rather than the results of soil testing. With plant-available soil nutrient supplies and seed yields increasing, the yield responses and fertilizer use efficiencies decreased. When the seed yields of no-N and no-P treatments were less than 2000 kg ha−1 and 1500 kg ha−1, the recommended fertilizer rate was beneficial for achieving high seed yield and high efficiency. As defined in our study, the recommended fertilization rates could be used as the regional mean optimal rates (RMOR) of fertilization for winter oilseed rape in the Yangtze River Basin. Partial adjustments according to crop nutrient uptakes and seed yields of the nutrient omission treatments will be feasible for the sites where they were nonresponsive to RMOR.
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Claims 11
Claim · model-written summary
Nitrogen contributed 40.4% to seed yield.
- Taxon
- oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- nitrogen (N)e0
- Outcome
- seed yielde0
- Value
- 40.4e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“the average contributions of nitrogen (N), phosphorus (P) and potassium (K) fertilizer to seed yield were 40.4, 23.1 and 11.5%, respectively”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
Phosphorus contributed 23.1% to seed yield.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- phosphorus (P)e0
- Outcome
- seed yielde0
- Value
- 23.1e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average contributions of nitrogen (N), phosphorus (P) and potassium (K) fertilizer to seed yield were 40.4, 23.1 and 11.5%, respectively”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
Potassium contributed 11.5% to seed yield.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- potassium (K) fertilizere0
- Outcome
- seed yielde0
- Value
- 11.5%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average contributions of nitrogen (N), phosphorus (P) and potassium (K) fertilizer to seed yield were 40.4, 23.1 and 11.5%, respectively”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
Recommended fertilization raised seed yield 29.1% over farmer practice.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- recommended fertilizatione0
- Outcome
- seed yielde0
- Direction
- enhancede0
- Value
- 29.1%e0
- Comparator
- farmers’ fertilization practices (FFP)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the farmers’ fertilization practices (FFP), the recommended fertilization significantly enhanced the seed yield by 29.1% on average”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
Plant-available soil nutrient supply and omission-treatment seed yield significantly related to yield response.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- nutrient omission treatmentse0
- Outcome
- yield responses to fertilizatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationships between plant-available soil nutrient supply, seed yields of the nutrient omission treatments and the yield responses to fertilization were significant”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
Soil testing did not show the same significant relationship to yield response.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- yield responses to fertilizatione0
- Comparator
- results of soil testinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationships between plant-available soil nutrient supply, seed yields of the nutrient omission treatments and the yield responses to fertilization were significant, rather than the results of soil testing”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
Yield responses fell as nutrient supply and seed yield increased.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- yield responsese0
- Direction
- decreasede0
- Setting
- plant-available soil nutrient suppliese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With plant-available soil nutrient supplies and seed yields increasing, the yield responses and fertilizer use efficiencies decreased”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
Fertilizer use efficiency fell as nutrient supply and seed yield increased.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- fertilizer use efficienciese0
- Direction
- decreasede0
- Setting
- plant-available soil nutrient suppliese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With plant-available soil nutrient supplies and seed yields increasing, the yield responses and fertilizer use efficiencies decreased”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
Recommended rates benefited yield and efficiency below the stated omission-yield thresholds.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- recommended fertilizer ratee0
- Outcome
- high seed yield and high efficiencye0
- Direction
- highe0
- Qualifier
- less than 2000 kg ha−1 and 1500 kg ha−1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the seed yields of no-N and no-P treatments were less than 2000 kg ha−1 and 1500 kg ha−1, the recommended fertilizer rate was beneficial for achieving high seed yield and high efficiency”
t0“oilseed rape (Brassica napus L.)”
Claim · model-written summary
The authors recommend the tested rates as regional mean optimal fertilization rates.
- Taxon
- oilseed rapeBrassica napuse0
- Outcome
- regional mean optimal rates (RMOR) of fertilizatione0
- Setting
- Yangtze River Basine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the recommended fertilization rates could be used as the regional mean optimal rates (RMOR) of fertilization for winter oilseed rape in the Yangtze River Basin”
Claim · model-written summary
The authors propose site adjustments based on crop nutrient uptake and omission-treatment yields where RMOR is unresponsive.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- Partial adjustments according to crop nutrient uptakes and seed yields of the nutrient omission treatmentse0
- Qualifier
- sites where they were nonresponsive to RMORe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Partial adjustments according to crop nutrient uptakes and seed yields of the nutrient omission treatments will be feasible for the sites where they were nonresponsive to RMOR”
t0“oilseed rape (Brassica napus L.)”
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See all 378 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.