Abstract
This study was conducted in the crop years 2007-1010 and aimed to evaluate the effects of previous crops and use of nitrogen (N) fertilizer on rapeseed productivity in Ahwaz, Iran. The previous crops were: i) barley + clover; ii) rapeseed; iii) corn; iv) mung-bean; v) rice; and vi) wheat. N fertilizer was applied to rapeseed at rates of 0, 100, 160 and 220 kg ha-1. The effects of management on yield, and product oil content and oil yield were assessed. The effect of the previous crop and the use made of N fertilizer both affected rapeseed productivity. The results of two repeated experiments showed that the lowest seed and oil yields were obtained when unfertilized rapeseed followed rice. The highest seed and oil yields were obtained when rapeseed production followed mung-bean as the previous crop (range 160-220 kg ha-1 N rate). Among yield components, previous crops and N rates significantly influenced the silique number per unit area, and this showed a similar variation to that of seed yield. Data averaged across 2-year periods indicated that the highest oil content occurred in unfertilized rapeseed plots when the effects of the previous crop were not significant. Nevertheless, rapeseed following mung-bean receiving 150-220 kg ha-1 N rates produced the highest yield in the two years in which the experiment was repeated. Rapeseed following mung-bean and receiving 160 kg N.ha-1 had also the highest nutrient use efficiency parameters.
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Claims 7
Claim · model-written summary
The previous crop and the use of N fertilizer both affected rapeseed productivity.
- Taxon
- rapeseede0
- Treatment
- previous crop and the use made of N fertilizere0
- Outcome
- productivitye0
- Setting
- Ahwaz, Irane1
Not reportedComparatorDirection
Verbatim
e0“The effect of the previous crop and the use made of N fertilizer both affected rapeseed productivity”
e1“This study was conducted in the crop years 2007-1010 and aimed to evaluate the effects of previous crops and use of nitrogen (N) fertilizer on rapeseed productivity in Ahwaz, Iran”
Claim · model-written summary
Lowest seed and oil yields occurred when unfertilized rapeseed followed rice.
- Taxon
- rapeseede2
- Treatment
- unfertilized rapeseed followed ricee2
- Outcome
- seed and oil yieldse2
- Direction
- loweste2
Not reportedComparator
Verbatim
e2“The results of two repeated experiments showed that the lowest seed and oil yields were obtained when unfertilized rapeseed followed rice”
Claim · model-written summary
Highest seed and oil yields occurred when rapeseed followed mung-bean as the previous crop at 160-220 kg ha-1 N.
- Taxon
- rapeseede3
- Treatment
- rapeseed production followed mung-bean as the previous crop (range 160-220 kg ha-1 N rate)e3
- Outcome
- seed and oil yieldse3
- Direction
- higheste3
Not reportedComparator
Verbatim
e3“The highest seed and oil yields were obtained when rapeseed production followed mung-bean as the previous crop (range 160-220 kg ha-1 N rate)”
Claim · model-written summary
Previous crops and N rates significantly influenced silique number per unit area in rapeseed, with a variation similar to seed yield.
- Taxon
- rapeseede1
- Treatment
- previous crops and N ratese4
- Outcome
- silique number per unit areae4
- Qualifier
- a similar variation to that of seed yielde4
- Setting
- Ahwaz, Irane1
Not reportedComparatorDirection
Verbatim
e1“This study was conducted in the crop years 2007-1010 and aimed to evaluate the effects of previous crops and use of nitrogen (N) fertilizer on rapeseed productivity in Ahwaz, Iran”
e4“Among yield components, previous crops and N rates significantly influenced the silique number per unit area, and this showed a similar variation to that of seed yield”
Claim · model-written summary
Oil content was highest in unfertilized rapeseed plots when the previous-crop effect was not significant.
- Taxon
- rapeseede5
- Treatment
- unfertilized rapeseed plotse5
- Outcome
- oil contente5
- Direction
- higheste5
- Qualifier
- when the effects of the previous crop were not significante5
Not reportedComparator
Verbatim
e5“Data averaged across 2-year periods indicated that the highest oil content occurred in unfertilized rapeseed plots when the effects of the previous crop were not significant”
Claim · model-written summary
Rapeseed following mung-bean receiving 150-220 kg ha-1 N produced the highest yield in both repeated years.
- Taxon
- rapeseede6
- Treatment
- rapeseed following mung-bean receiving 150-220 kg ha-1 N ratese6
- Outcome
- yielde6
- Direction
- higheste6
- Qualifier
- in the two years in which the experiment was repeatede6
Not reportedComparator
Verbatim
e6“Nevertheless, rapeseed following mung-bean receiving 150-220 kg ha-1 N rates produced the highest yield in the two years in which the experiment was repeated”
Claim · model-written summary
Rapeseed following mung-bean with 160 kg N ha-1 had the highest nutrient use efficiency parameters.
- Taxon
- Rapeseede7
- Treatment
- Rapeseed following mung-bean and receiving 160 kg N.ha-1e7
- Outcome
- nutrient use efficiency parameterse7
- Direction
- higheste7
Not reportedComparator
Verbatim
e7“Rapeseed following mung-bean and receiving 160 kg N.ha-1 had also the highest nutrient use efficiency parameters”
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