Abstract
Although tillage systems and crop rotations can affect crop production and uptake of nutrients, their long-term effects, particularly their interactions, are not well-documented. Therefore, we measured the N, P, and K contents and yields of crops through two rotation cycles, especially wheat (Triticum aestivum L.), of four crop rotations managed under conventional tillage (CT) and no-tillage (NT) systems. The study was conducted 1993 through 2000 on a sandy loam soil in northwestern Alberta, Canada. The four-course crop rotations were: (i) field pea (Pisum sativum L.)-wheat-canola (Brassica rapa L.)-wheat; (ii) red clover (Trifolium pratense L.) green manure-wheat-canola-wheat; (iii) fallow-wheat-canola-wheat, and (iv) continuous wheat (CW). The crops were fertilized using regional recommendations based on soil test results. Previous crop effect on wheat yield was in the order: field pea = red clover green manure > fallow > canola > wheat (CW); it had little influence on N, P or K content in wheat grain or straw. There was no interaction of tillage with crop rotation on wheat production or nutrient content. Tillage treatments affected neither production of other rotation crops nor their nutrient concentrations. During the second rotation cycle, N fertilizer requirement decreased, and wheat yield was 22% higher, under NT as compared to CT. This study showed that (i) field pea is an attractive replacement for red clover green manure; and (ii) recommendations for N from soil test results should factor in the type of tillage system used. Key words: Canola, field pea, red clover, nitrogen, tillage, wheat
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Claims 8
Claim · model-written summary
Previous crop affected wheat yield, with field pea and red clover green manure highest and continuous wheat lowest.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- Previous crope1
- Outcome
- wheat yielde1
- Direction
- higherinferrede1
- Comparator
- wheat (CW)e1
- Setting
- northwestern Alberta, Canadae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Previous crop effect on wheat yield was in the order: field pea = red clover green manure > fallow > canola > wheat (CW); it had little influence on N, P or K content in wheat grain or straw”
e2“The study was conducted 1993 through 2000 on a sandy loam soil in northwestern Alberta, Canada”
Claim · model-written summary
Previous crop had little influence on N, P or K content in wheat grain or straw.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Previous crope1
- Outcome
- N, P or K content in wheat grain or strawe1
- Direction
- no_changeinferrede1
- Setting
- northwestern Alberta, Canadae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Previous crop effect on wheat yield was in the order: field pea = red clover green manure > fallow > canola > wheat (CW); it had little influence on N, P or K content in wheat grain or straw”
e2“The study was conducted 1993 through 2000 on a sandy loam soil in northwestern Alberta, Canada”
Claim · model-written summary
Tillage and crop rotation did not interact in their effect on wheat production or nutrient content.
- Taxon
- wheatTriticum aestivume3
- Treatment
- tillagee3
- Outcome
- wheat production or nutrient contente3
- Direction
- no_changeinferrede3
- Setting
- northwestern Alberta, Canadae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“There was no interaction of tillage with crop rotation on wheat production or nutrient content”
e2“The study was conducted 1993 through 2000 on a sandy loam soil in northwestern Alberta, Canada”
Claim · model-written summary
Tillage affected neither the production nor the nutrient concentrations of the other rotation crops.
- Taxon
- other rotation cropse4
- Treatment
- Tillage treatmentse4
- Outcome
- production of other rotation crops nor their nutrient concentrationse4
- Direction
- no_changeinferrede4
- Setting
- northwestern Alberta, Canadae2
Not reportedComparator
Verbatim
e4“Tillage treatments affected neither production of other rotation crops nor their nutrient concentrations”
e2“The study was conducted 1993 through 2000 on a sandy loam soil in northwestern Alberta, Canada”
Claim · model-written summary
In the second rotation cycle, wheat N fertilizer requirement decreased under no-tillage compared with conventional tillage.
- Taxon
- wheatTriticum aestivume1
- Treatment
- no-tillage (NT)e5
- Outcome
- N fertilizer requiremente1
- Direction
- decreasede1
- Qualifier
- During the second rotation cyclee1
- Comparator
- conventional tillage (CT)e5
- Setting
- northwestern Alberta, Canadae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“During the second rotation cycle, N fertilizer requirement decreased, and wheat yield was 22% higher, under NT as compared to CT”
e2“The study was conducted 1993 through 2000 on a sandy loam soil in northwestern Alberta, Canada”
e5“managed under conventional tillage (CT) and no-tillage (NT) systems”
Claim · model-written summary
In the second rotation cycle, wheat yield was 22% higher under no-tillage than under conventional tillage.
- Taxon
- wheatTriticum aestivume1
- Treatment
- no-tillage (NT)e5
- Outcome
- wheat yielde1
- Direction
- highere1
- Value
- 22%e1
- Qualifier
- During the second rotation cyclee1
- Comparator
- conventional tillage (CT)e5
- Setting
- northwestern Alberta, Canadae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“During the second rotation cycle, N fertilizer requirement decreased, and wheat yield was 22% higher, under NT as compared to CT”
e2“The study was conducted 1993 through 2000 on a sandy loam soil in northwestern Alberta, Canada”
e5“managed under conventional tillage (CT) and no-tillage (NT) systems”
Claim · model-written summary
The authors recommend field pea as an attractive replacement for red clover green manure.
Verbatim
e6“field pea is an attractive replacement for red clover green manure”
Claim · model-written summary
The authors recommend that N recommendations from soil test results should account for the tillage system used.
- Taxon
- wheatTriticum aestivume6
- Outcome
- recommendations for N from soil test resultse7
- Qualifier
- should factor in the type of tillage system usede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“especially wheat (Triticum aestivum L.)”
e7“recommendations for N from soil test results should factor in the type of tillage system used”
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See all 1,414 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.