Abstract
The objective of this study was to determine the influence of tillage methods (conventional tillage (CT) and minimum tillage (MT)) and N rates (0, 50, 150, 250 kg N ha−1) on crop yield, N uptake and soil organic carbon (SOC), bulk density (BD), total N (TN), electrical conductivity (EC), pH and soil nutrient contents on a clay-loam near Hashtgerd, Iran. A successive corn-based rotation (2012–2014) was conducted as a split-plot in a randomized complete block design in which tillage methods were considered as main plots, and N rates as subplots. Tillage had no significant effect on corn 2012 and canola 2012–2013 grain yields. CT and MT systems showed different critical N rates to reach their maximum grain yield in corn (2013) and wheat (2013–2014). MT system required more N application to reach its maximum grain yield. Tillage × N rate effect on none of the soil properties was significant. Tillage had no significant (P ≤ 0.05) effect on soil pH, BD, TN and SOC. However, soil EC of 0–5 cm depth in MT system was higher than CT system by 64%. MT system under higher N application could increase corn grain yield, but on the other hand probably adversely changes soil chemical properties.
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Claims 11
Claim · model-written summary
Tillage had no significant effect on corn grain yield in 2012.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Tillagee0
- Outcome
- grain yieldse0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage had no significant effect on corn 2012 and canola 2012–2013 grain yields”
Claim · model-written summary
Tillage had no significant effect on canola grain yield in 2012-2013.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- Tillagee0
- Outcome
- grain yieldse0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Tillage had no significant effect on corn 2012 and canola 2012–2013 grain yields”
Claim · model-written summary
Conventional and minimum tillage systems showed different critical N rates to reach maximum grain yield in corn in 2013.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- CT and MT systemse0
- Outcome
- critical N rates to reach their maximum grain yielde0
- Direction
- differente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT and MT systems showed different critical N rates to reach their maximum grain yield in corn (2013) and wheat (2013–2014)”
Claim · model-written summary
Conventional and minimum tillage systems showed different critical N rates to reach maximum grain yield in wheat in 2013-2014.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- CT and MT systemse0
- Outcome
- critical N rates to reach their maximum grain yielde0
- Direction
- differente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT and MT systems showed different critical N rates to reach their maximum grain yield in corn (2013) and wheat (2013–2014)”
Claim · model-written summary
The minimum tillage system required more N application than conventional tillage to reach maximum grain yield.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- MT systeme0
- Outcome
- N application to reach its maximum grain yielde0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“corn-based rotation”
e0“MT system required more N application to reach its maximum grain yield”
Claim · model-written summary
The tillage by N rate interaction was not significant for any of the soil properties.
Not reportedTaxonComparatorDirection
Verbatim
e0“Tillage × N rate effect on none of the soil properties was significant”
Claim · model-written summary
Tillage had no significant effect on soil pH, bulk density and total N.
Not reportedTaxonComparator
Verbatim
e0“Tillage had no significant (P ≤ 0.05) effect on soil pH, BD, TN and SOC”
Claim · model-written summary
Tillage had no significant effect on soil organic carbon.
Not reportedTaxonComparator
Verbatim
e0“Tillage had no significant (P ≤ 0.05) effect on soil pH, BD, TN and SOC”
Claim · model-written summary
Soil electrical conductivity at 0-5 cm depth was 64% higher under minimum tillage than under conventional tillage.
- Treatment
- MT systeme0
- Outcome
- soil EC of 0–5 cm depthe0
- Direction
- highere0
- Value
- 64%e0
- Comparator
- CT systeme0
Not reportedTaxon
Verbatim
e0“soil EC of 0–5 cm depth in MT system was higher than CT system by 64%”
Claim · model-written summary
Minimum tillage under higher N application could increase corn grain yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- MT system under higher N applicatione0
- Outcome
- grain yielde0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MT system under higher N application could increase corn grain yield”
Claim · model-written summary
Minimum tillage under higher N probably adversely changes soil chemical properties.
Not reportedTaxonTreatmentComparator
Verbatim
e0“probably adversely changes soil chemical properties”
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