Abstract
The optimal dose of nitrogen (N) in potato crop depends on the production system. The objective of this study was to determine the optimal dose of N for the production of basic potato seed minitubers and evaluate the effect of N rates on physiological and nitrogen indices in the youngest fully developed leaf (fourth leaf) and in the oldest leaf of the plants at 60 days after planting. The experiment was conducted in a greenhouse at the Departamento de Fitotecnia da Universidade Federal de Viçosa. The treatments consisted of five N rates (0, 45, 90, 180 and 360 mg dm-3), with 10% of each dose applied at planting and the remainder through irrigation water, daily, for 30 days. The nitrogen rates positively influenced the physiological indices (length, width, leaf area, number of leaves, fresh mass and dry mass) and nitrogen (level and content of N and N-NO³ in the dry mass and SPAD) both in the fourth leaf and in the oldest leaf. Likewise, the N rates positively influenced the number and mass of harvested tubers. The largest number (5.44 tubers/plant) and the maximum mass of tubers (243.5 g/plant) were obtained with 360.0 and 332.9 mg N dm-3, respectively. Therefore, the mass and number of tubers were not optimized by the same N rate. The critical SPAD index was 38.8 in the fourth leaf, which was more sensitive to the effect of N rates than the oldest leaf.
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Claims 9
Claim · model-written summary
Nitrogen rates positively affected fourth-leaf and oldest-leaf growth indices.
- Taxon
- potato
Solanum tuberosumt0 - Organ / stage
- fourth leafe0
- Treatment
- nitrogen ratese0
- Outcome
- length, width, leaf areae0
- Direction
- positively influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen rates positively influenced the physiological indices (length, width, leaf area, number of leaves, fresh mass and dry mass) and nitrogen (level and content of N and N-NO³ in the dry mass and SPAD) both in the fourth leaf and in the oldest leaf.”
t0“potato seed minitubers”
Claim · model-written summary
Nitrogen rates positively affected leaf number and mass.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- nitrogen ratese0
- Outcome
- number of leaves, fresh mass and dry masse0
- Direction
- positively influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen rates positively influenced the physiological indices (length, width, leaf area, number of leaves, fresh mass and dry mass) and nitrogen (level and content of N and N-NO³ in the dry mass and SPAD) both in the fourth leaf and in the oldest leaf.”
t0“potato seed minitubers”
Claim · model-written summary
Nitrogen rates positively affected leaf nitrogen level, content and SPAD.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- nitrogen ratese0
- Outcome
- level and content of N and N-NO³ in the dry mass and SPADe0
- Direction
- positively influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen rates positively influenced the physiological indices (length, width, leaf area, number of leaves, fresh mass and dry mass) and nitrogen (level and content of N and N-NO³ in the dry mass and SPAD) both in the fourth leaf and in the oldest leaf.”
t0“potato seed minitubers”
Claim · model-written summary
Nitrogen rates increased the number of harvested tubers.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N ratese0
- Outcome
- numbere0
- Direction
- positively influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Likewise, the N rates positively influenced the number and mass of harvested tubers.”
t0“potato seed minitubers”
Claim · model-written summary
Nitrogen rates increased the mass of harvested tubers.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N ratese0
- Outcome
- mass of harvested tuberse0
- Direction
- positively influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Likewise, the N rates positively influenced the number and mass of harvested tubers.”
t0“potato seed minitubers”
Claim · model-written summary
The largest tuber number was 5.44 per plant at 360.0 mg N dm-3.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 360.0e0
- Outcome
- largest numbere0
- Direction
- largeste0
- Value
- 5.44 tubers/plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The largest number (5.44 tubers/plant) and the maximum mass of tubers (243.5 g/plant) were obtained with 360.0 and 332.9 mg N dm-3, respectively.”
t0“potato seed minitubers”
Claim · model-written summary
Maximum tuber mass was 243.5 g per plant at 332.9 mg N dm-3.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 332.9 mg N dm-3e0
- Outcome
- maximum mass of tuberse0
- Direction
- maximume0
- Value
- 243.5 g/plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The largest number (5.44 tubers/plant) and the maximum mass of tubers (243.5 g/plant) were obtained with 360.0 and 332.9 mg N dm-3, respectively.”
t0“potato seed minitubers”
Claim · model-written summary
The critical SPAD index was 38.8 in the fourth leaf.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- fourth leafe0
- Outcome
- critical SPAD indexe0
- Value
- 38.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical SPAD index was 38.8 in the fourth leaf, which was more sensitive to the effect of N rates than the oldest leaf.”
t0“potato seed minitubers”
Claim · model-written summary
The fourth leaf was more sensitive to nitrogen rates than the oldest leaf.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- fourth leafe0
- Outcome
- sensitive to the effect of N ratese0
- Direction
- more sensitivee0
- Comparator
- oldest leafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the fourth leaf, which was more sensitive to the effect of N rates than the oldest leaf.”
t0“potato seed minitubers”
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See all 51 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.