Abstract
Karamanos, R. E., Selles, F., James, D. C. and Stevenson, F. C. 2012. Nitrogen management of fallow crops in Canadian prairie soils. Can. J. Plant Sci. 92: 1389–1401. The ability of fallow to supply nitrogen (N) to crops has been questioned, particularly for crops with greater N requirements. A study was conducted to determine canola (Brassica napus L.) and wheat (Triticum aestivum L.) responses to a range of N fertilizer rates (0–75 kg N ha −1 for canola and 0–50 kg N ha −1 for wheat) at 17 fallow sites across Saskatchewan and Alberta, Canada, from 2003 to 2005. Yield and N uptake responses to progressively greater N fertilizer rates were curvilinear for both crops. Maximum yield occurred with 76 kg N ha −1 for canola yield (2190 kg ha −1 ) and 47 kg N ha −1 for wheat (2910 kg ha −1 ). Maximum N uptake occurred at about 90 kg N ha −1 for both crops. Wheat grain yield and N uptake responses were mostly associated with normalized difference vegetation index (NDVI) at anthesis or flag leaf, whereas canola yields and N uptake were most associated with NDVI at five-leaf or bolting, or Cardy Nitrate meter at bolting. The preceding relationships were most apparent at the highest N fertilizer rates. Canola and wheat water use were not affected by N fertilizer rate, but water use efficiency increased linearly for both crops as N fertilizer rate was increased.
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Claims 15
Claim · model-written summary
Canola yield and N uptake responded curvilinearly to N fertilizer rate.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse1 - Treatment
- progressively greater N fertilizer ratese0
- Outcome
- Yield and N uptake responsese0
- Direction
- curvilineare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Yield and N uptake responses to progressively greater N fertilizer rates were curvilinear for both crops.”
t0“fallow crops”
e1“canola (Brassica napus L.) and wheat (Triticum aestivum L.)”
Claim · model-written summary
Wheat yield and N uptake responded curvilinearly to N fertilizer rate.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- progressively greater N fertilizer ratese0
- Outcome
- Yield and N uptake responsese0
- Direction
- curvilineare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield and N uptake responses to progressively greater N fertilizer rates were curvilinear for both crops.”
t0“fallow crops”
e1“canola (Brassica napus L.) and wheat (Triticum aestivum L.)”
Claim · model-written summary
Canola maximum yield was 2190 kg ha −1 at 76 kg N ha −1.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- 76 kg N ha −1e0
- Outcome
- yielde0
- Direction
- Maximume0
- Value
- 2190 kg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum yield occurred with 76 kg N ha −1 for canola yield (2190 kg ha −1 )”
Claim · model-written summary
Wheat maximum yield was 2910 kg ha −1 at 47 kg N ha −1.
Not reportedComparator
Verbatim
e0“47 kg N ha −1 for wheat (2910 kg ha −1 )”
t0“fallow crops”
e1“canola (Brassica napus L.) and wheat (Triticum aestivum L.)”
e2“Maximum yield occurred with 76 kg N ha −1 for canola yield (2190 kg ha −1 )”
Claim · model-written summary
Maximum N uptake occurred around 90 kg N ha −1 for canola.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- 90 kg N ha −1e0
- Outcome
- N uptakee0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum N uptake occurred at about 90 kg N ha −1 for both crops.”
t0“fallow crops”
e1“canola (Brassica napus L.) and wheat (Triticum aestivum L.)”
Claim · model-written summary
Maximum N uptake occurred around 90 kg N ha −1 for wheat.
- Taxon
- wheatTriticum aestivume1
- Treatment
- 90 kg N ha −1e0
- Outcome
- N uptakee0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum N uptake occurred at about 90 kg N ha −1 for both crops.”
t0“fallow crops”
e1“canola (Brassica napus L.) and wheat (Triticum aestivum L.)”
Claim · model-written summary
Wheat grain yield was chiefly associated with NDVI at anthesis or flag leaf.
- Taxon
- WheatTriticum aestivume0
- Organ / stage
- anthesis or flag leafe0
- Outcome
- grain yielde0
- Qualifier
- normalized difference vegetation index (NDVI)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat grain yield and N uptake responses were mostly associated with normalized difference vegetation index (NDVI) at anthesis or flag leaf”
Claim · model-written summary
Wheat N uptake was chiefly associated with NDVI at anthesis or flag leaf.
- Taxon
- WheatTriticum aestivume0
- Organ / stage
- anthesis or flag leafe0
- Outcome
- N uptakee0
- Qualifier
- normalized difference vegetation index (NDVI)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat grain yield and N uptake responses were mostly associated with normalized difference vegetation index (NDVI) at anthesis or flag leaf”
Claim · model-written summary
Canola yield was most associated with early NDVI or bolting nitrate readings.
- Taxon
- canolaBrassica napus var. napuse0
- Organ / stage
- five-leaf or boltinge0
- Outcome
- yieldse0
- Qualifier
- NDVIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola yields and N uptake were most associated with NDVI at five-leaf or bolting, or Cardy Nitrate meter at bolting”
Claim · model-written summary
Canola N uptake was most associated with early NDVI or bolting nitrate readings.
- Taxon
- canolaBrassica napus var. napuse0
- Organ / stage
- five-leaf or boltinge0
- Outcome
- N uptakee0
- Qualifier
- Cardy Nitrate metere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola yields and N uptake were most associated with NDVI at five-leaf or bolting, or Cardy Nitrate meter at bolting”
Claim · model-written summary
These index relationships were clearest at the highest N rates.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- highest N fertilizer ratese0
- Outcome
- preceding relationshipse0
- Direction
- most apparente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The preceding relationships were most apparent at the highest N fertilizer rates.”
t0“fallow crops”
e1“canola (Brassica napus L.) and wheat (Triticum aestivum L.)”
Claim · model-written summary
Canola water use was unaffected by N fertilizer rate.
- Taxon
- CanolaBrassica napus var. napuse0
- Treatment
- N fertilizer ratee0
- Outcome
- water usee0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canola and wheat water use were not affected by N fertilizer rate”
Claim · model-written summary
Wheat water use was unaffected by N fertilizer rate.
- Taxon
- wheatTriticum aestivume0
- Treatment
- N fertilizer ratee0
- Outcome
- water usee0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canola and wheat water use were not affected by N fertilizer rate”
Claim · model-written summary
Canola water use efficiency rose linearly as N rate increased.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- N fertilizer ratee0
- Outcome
- water use efficiencye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water use efficiency increased linearly for both crops as N fertilizer rate was increased”
t0“fallow crops”
e1“canola (Brassica napus L.) and wheat (Triticum aestivum L.)”
Claim · model-written summary
Wheat water use efficiency rose linearly as N rate increased.
- Taxon
- wheatTriticum aestivume1
- Treatment
- N fertilizer ratee0
- Outcome
- water use efficiencye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water use efficiency increased linearly for both crops as N fertilizer rate was increased”
t0“fallow crops”
e1“canola (Brassica napus L.) and wheat (Triticum aestivum L.)”
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See all 116 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.