Abstract
One approach for reducing the contribution of potato (Solanum tuberosum L.) production to nitrate contamination of groundwater is to develop cultivars which utilize N more efficiently. In this study, variation in N use efficiency (NUE; dry matter production per unit crop N supply) characteristics of 20 commercial potato cultivars of North American and European origin were evaluated in 2 yr. Cultivars were grown with or without application of 100 kg N ha -1 as ammonium nitrate banded at planting. The recommended within-row spacing was used for each cultivar and no irrigation was applied. Plant dry matter and N accumulation were determined prior to significant leaf senescence. Crop N supply was estimated as fertilizer N applied plus soil inorganic N measured at planting plus apparent net soil N mineralization. Nitrogen use efficiency decreased curvilinearly with increasing crop N supply. Nitrogen use efficiency was lower for early-maturing cultivars compared to mid-season and late-maturing cultivars. A curvilinear relationship was obtained between plant dry matter accumulation and plant N accumulation using data for all cultivars. Deviations from this relationship were interpreted as variation in N utilization efficiency (NUtE; dry matter accumulation per unit N accumulation). Significant differences in NUtE were measured among cultivars of similar maturity. Nitrogen uptake efficiency (NUpE; plant N content per unit crop N supply) and soil nitrate concentration measured at plant harvest were uniformly low for all cultivars when crop N supply was limited, but varied among cultivars when N was more abundant. This suggests that potato cultivars vary more in terms of N uptake capacity (plant N accumulation in the presence of an abundant N supply) than in terms of NUpE. Key words: Solanum tuberosum, N mineralization, dry matter accumulation, N accumulation, N utilization efficiency
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Claims 9
Claim · model-written summary
Potato nitrogen use efficiency fell curvilinearly as crop nitrogen supply increased.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- crop N supplye0
- Outcome
- Nitrogen use efficiencye0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen use efficiency decreased curvilinearly with increasing crop N supply”
t0“potato”
Claim · model-written summary
Early maturing potato cultivars had lower nitrogen use efficiency than mid and late cultivars.
- Taxon
- potatoSolanum tuberosumt0
- Material
- early-maturing cultivarse0
- Outcome
- Nitrogen use efficiencye0
- Direction
- lowere0
- Comparator
- mid-season and late-maturing cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen use efficiency was lower for early-maturing cultivars compared to mid-season and late-maturing cultivars”
t0“potato”
Claim · model-written summary
Plant dry matter accumulation related curvilinearly to plant nitrogen accumulation.
- Taxon
- potatoSolanum tuberosumt0
- Compound
- plant N accumulatione0
- Outcome
- plant dry matter accumulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A curvilinear relationship was obtained between plant dry matter accumulation and plant N accumulation using data for all cultivars”
t0“potato”
Claim · model-written summary
Nitrogen utilization efficiency differed significantly among cultivars of similar maturity.
- Taxon
- potatoSolanum tuberosumt0
- Material
- cultivars of similar maturitye0
- Outcome
- NUtEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences in NUtE were measured among cultivars of similar maturity”
t0“potato”
Claim · model-written summary
Nitrogen uptake efficiency was uniformly low across cultivars when nitrogen supply was limited.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- Nitrogen uptake efficiencye0
- Direction
- lowe0
- Qualifier
- when crop N supply was limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen uptake efficiency (NUpE; plant N content per unit crop N supply) and soil nitrate concentration measured at plant harvest were uniformly low for all cultivars when crop N supply was limited”
t0“potato”
Claim · model-written summary
Soil nitrate at potato harvest was uniformly low across cultivars when nitrogen supply was limited.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- soil nitrate concentratione0
- Direction
- lowe0
- Qualifier
- when crop N supply was limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil nitrate concentration measured at plant harvest were uniformly low for all cultivars when crop N supply was limited”
t0“potato”
Claim · model-written summary
Nitrogen uptake efficiency varied among cultivars when nitrogen was more abundant.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- Nitrogen uptake efficiencye0
- Direction
- variede0
- Qualifier
- when N was more abundante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen uptake efficiency (NUpE; plant N content per unit crop N supply) and soil nitrate concentration measured at plant harvest were uniformly low for all cultivars when crop N supply was limited, but varied among cultivars when N was more abundant”
t0“potato”
Claim · model-written summary
Soil nitrate at harvest varied among cultivars when nitrogen was more abundant.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- soil nitrate concentratione0
- Direction
- variede0
- Qualifier
- when N was more abundante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil nitrate concentration measured at plant harvest were uniformly low for all cultivars when crop N supply was limited, but varied among cultivars when N was more abundant”
t0“potato”
Claim · model-written summary
The authors infer cultivars vary more in nitrogen uptake capacity than uptake efficiency.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- N uptake capacitye0
- Direction
- vary moree0
- Comparator
- NUpEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato cultivars vary more in terms of N uptake capacity (plant N accumulation in the presence of an abundant N supply) than in terms of NUpE”