Abstract
The introduction of canola (oilseed rape; Brassica napus L.) as a new source of vegetable oil production in Iran prompts evaluation of the performance of this crop under different tillage systems. A field experiment was conducted to determine the impact of depth and in-tensity of tillage on soil physical properties, crop establishment and yield of irrigated winter canola in a loam soil (Typic Haplargids) near Isfahan in central Iran. In a split-plot design, three primary tillage treatments consisted of moldboard plowing to 20 cm (MP20), two passes of a cultivator first to 10 and then to 15 cm (2TC15), and one single pass of cultivator to 10 cm (TC10), were combined with two seedbed preparation treatments (four passes with a disk harrow as opposed to a single pass with a rotary tiller). Results showed that the soil bulk density in the 0-5 and 5-10 cm layers were not significantly affected by primary tillage treatments. Soil penetration resistance (PR) in the 0-10 cm layer was significantly higher in 2TC15 compared to moldboard plowed soil; however, no significant effect of primary tillage was detected on PR in the 10-20 cm depth. A single pass by a rotary tiller was as effective in seedbed preparation as four passes of a disk harrow, as assessed by bulk density, penetra-
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Claims 3
Claim · model-written summary
Primary tillage did not significantly affect bulk density at 0-5 or 5-10 cm.
- Taxon
- Canola
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Brassica napus var. napust0 - Treatment
- primary tillage treatmentse0
- Outcome
- soil bulk density in the 0-5 and 5-10 cm layerse0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“soil bulk density in the 0-5 and 5-10 cm layers were not significantly affected by primary tillage treatments”
t0“Canola”
Claim · model-written summary
Soil penetration resistance at 0-10 cm was significantly higher under 2TC15 than moldboard plowing.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- 2TC15e0
- Outcome
- Soil penetration resistance (PR) in the 0-10 cm layere0
- Direction
- highere0
- Comparator
- moldboard plowed soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil penetration resistance (PR) in the 0-10 cm layer was significantly higher in 2TC15 compared to moldboard plowed soil”
t0“Canola”
Claim · model-written summary
Primary tillage had no significant effect on penetration resistance at 10-20 cm.
- Taxon
- CanolaBrassica napus var. napust0
- Treatment
- primary tillagee0
- Outcome
- PR in the 10-20 cm depthe0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant effect of primary tillage was detected on PR in the 10-20 cm depth”
t0“Canola”
The same questions in other papers
tillage · soil: physics · Brassica napus (oilseed rape)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
1 paper more in this group
See all 5 papers →tillage · disease · Brassica napus (oilseed rape)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.