Abstract
Abstract Background and Objective: The objective of this research was to evaluate the effect of fertilizer treatments on some morpho-physiological traits, yield and yield components and oil of rapeseed (cv. Delgan) under different levels of water supply. Materials and Methods: A field experiments was conducted in two years of 2018 and 2019 as split-plot based on RCB design in three replications. Irrigation intervals as irrigation after 70, 100, 130 and 160 mm evaporation from class A pan were located in main plots and fertilizer treatments as F0: control, F1: chemical fertilizer (nitrogen and phosphorus) , F2: inoculation with plant growth-promoting rhizobacteria (PGPR), F3: vermicompost and F4: combined fertilization (1/3 F1 + 1/3 F3 + inoculation PGPR) were allocated to sub-plots. Results: Leaf temperature increased under drought stress, but the amount of nitrogen and phosphorus in rapeseed leaves, leaf water content, plant height, stem diameter, number of branches and leaves per plant, length and number of siliques per plant, grains per silique, plant biomass, and subsequently grain yield per plant were decreased. Application of fertilizer treatments, especially the combination of bio-fertilizers and chemical fertilizers (F4), improved all these traits (except stem diameter) and resulted in increased rapeseed plant yield, particularly under moderate (I3) and severe (I4) stresses. Oil percentage was also improved in the treatments inoculated with the growth promoting bacteria. Conclusion: Increasing oil percentage and grain yield eventually increased oil yield of rapeseed plants. It was concluded that combination of chemical and bio-fertilizers could be an effective method to improve field and economic (oil) performance of rapeseed plants under water stress conditions.
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Claims 12
Claim · model-written summary
Drought stress increased rapeseed leaf temperature.
Not reportedComparator
Verbatim
e0“Leaf temperature increased under drought stress”
t0“Rapeseed (Brassica napus L.)”
Claim · model-written summary
Drought stress decreased leaf nitrogen and phosphorus in rapeseed.
- Taxon
- rapeseede0
- Treatment
- drought stresse1
- Outcome
- amount of nitrogen and phosphorus in rapeseed leavese0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“the amount of nitrogen and phosphorus in rapeseed leaves, leaf water content, plant height, stem diameter, number of branches and leaves per plant, length and number of siliques per plant, grains per silique, plant biomass, and subsequently grain yield per plant were decreased”
e1“Leaf temperature increased under drought stress”
Claim · model-written summary
Drought stress decreased rapeseed leaf water content.
Not reportedComparator
Verbatim
e0“leaf water content, plant height, stem diameter, number of branches and leaves per plant, length and number of siliques per plant, grains per silique, plant biomass, and subsequently grain yield per plant were decreased”
e1“Leaf temperature increased under drought stress”
t0“Rapeseed”
Claim · model-written summary
Drought stress decreased rapeseed plant height, stem diameter and branch number.
- Taxon
- Rapeseedt0
- Treatment
- drought stresse1
- Outcome
- plant height, stem diameter, number of branchese0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“plant height, stem diameter, number of branches and leaves per plant, length and number of siliques per plant, grains per silique, plant biomass, and subsequently grain yield per plant were decreased”
e1“Leaf temperature increased under drought stress”
t0“Rapeseed”
Claim · model-written summary
Drought stress decreased rapeseed leaf number and silique length and number.
- Taxon
- Rapeseedt0
- Treatment
- drought stresse1
- Outcome
- leaves per plant, length and number of siliques per plante0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“number of branches and leaves per plant, length and number of siliques per plant, grains per silique, plant biomass, and subsequently grain yield per plant were decreased”
e1“Leaf temperature increased under drought stress”
t0“Rapeseed”
Claim · model-written summary
Drought stress decreased rapeseed grains per silique and biomass.
- Taxon
- Rapeseedt0
- Treatment
- drought stresse1
- Outcome
- grains per silique, plant biomasse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“grains per silique, plant biomass, and subsequently grain yield per plant were decreased”
e1“Leaf temperature increased under drought stress”
t0“Rapeseed”
Claim · model-written summary
Drought stress decreased rapeseed grain yield per plant.
Not reportedComparator
Verbatim
e0“grain yield per plant were decreased”
e1“Leaf temperature increased under drought stress”
t0“Rapeseed”
Claim · model-written summary
Fertilizers improved the measured traits except stem diameter, especially combined fertilization.
- Treatment
- combination of bio-fertilizers and chemical fertilizers (F4)e0
- Outcome
- all these traits (except stem diameter)e0
- Direction
- improvede0
Not reportedTaxonComparator
Verbatim
e0“Application of fertilizer treatments, especially the combination of bio-fertilizers and chemical fertilizers (F4), improved all these traits (except stem diameter)”
Claim · model-written summary
Fertilizer treatments increased rapeseed yield, especially under moderate and severe stress.
- Taxon
- rapeseede0
- Treatment
- combination of bio-fertilizers and chemical fertilizers (F4)e0
- Outcome
- plant yielde0
- Direction
- increasede0
- Qualifier
- moderate (I3) and severe (I4) stressese0
Not reportedComparator
Verbatim
e0“Application of fertilizer treatments, especially the combination of bio-fertilizers and chemical fertilizers (F4), improved all these traits (except stem diameter) and resulted in increased rapeseed plant yield, particularly under moderate (I3) and severe (I4) stresses.”
Claim · model-written summary
Growth-promoting bacterial inoculation improved rapeseed oil percentage.
- Taxon
- rapeseede1
- Treatment
- treatments inoculated with the growth promoting bacteriae0
- Interactor
- plant growth-promoting rhizobacteriae2symbiont
- Outcome
- Oil percentagee0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“Oil percentage was also improved in the treatments inoculated with the growth promoting bacteria.”
e1“oil of rapeseed (cv. Delgan)”
e2“plant growth-promoting rhizobacteria (PGPR)”
Claim · model-written summary
Higher oil percentage and grain yield increased rapeseed oil yield.
Verbatim
e0“Increasing oil percentage and grain yield eventually increased oil yield of rapeseed plants.”
Claim · model-written summary
The authors recommend combining chemical and bio-fertilizers for rapeseed under water stress.
Verbatim
e0“combination of chemical and bio-fertilizers could be an effective method to improve field and economic (oil) performance of rapeseed plants under water stress conditions.”
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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.