Abstract
This study evaluated the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.) in two sites in a commercial field in 1999–2001. One trial was established at each of the two sites chosen to represent two management zones (MZ) previously delineated by soil electrical conductivity, and differing in soil water availability, as controlled by depth to a clayey substratum. Each trial had 21 treatments including five rates of ammonium nitrate (0–200 kg N ha - 1 in 1999; 0–240 kg N ha - 1 in 2000 and 2001), each applied according to five application timings (100, 75, 50, 25 or 0% of N applied at planting with the remainder applied at hilling). Increasing N rate increased total and marketable tuber yields in both sites. The N rates required to optimize economic return ranged from 167 to 239 kg ha - 1 among years and between sites. Nitrogen fertilizer applied all at planting or all at hilling decreased tuber yields in both sites compared with split N application. The percentage of N rate applied at planting to achieve the maximum marketable tuber yield varied among years from 34 to 61% and allowed a yield increase of 2 to 20%. The proportion of large tubers was higher in the site with a greater depth to the clayey substratum (DMZ site) than in the site with a shallower depth to the clayey substratum (SMZ site). Tuber yield and tuber N uptake were higher in the SMZ site than in the DMZ site when no fertilizer N was applied, and tuber yield was more responsive to fertilizer N rate in the DMZ site than in the SMZ site in one year; however, these differences are not sufficient to justify different fertilizer N management for the two sites. The two sites frequently differed in terms of tuber yield, tuber size and specific gravity, which are important parameters in determining tuber processing quality but the optimal N rate and N timing were similar. These differences may be sufficiently large to justify different potato management practices (e.g., nutrient management, seedpiece spacing) to optimize potato production for the chip processing market. Key words: Solanum tuberosum, marketable yield, tuber size distribution, specific gravity, N economic optimum
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Claims 12
Claim · model-written summary
Increasing N rate increased total and marketable tuber yields of potato.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- N ratee1
- Outcome
- total and marketable tuber yieldse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e1“Increasing N rate increased total and marketable tuber yields in both sites”
Claim · model-written summary
The N rates required to optimize economic return of potato ranged from 167 to 239 kg ha -1 among years and sites.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- N rates required to optimize economic returne2
- Value
- 167 to 239 kg ha - 1e2
- Qualifier
- among years and between sitese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e2“The N rates required to optimize economic return ranged from 167 to 239 kg ha - 1 among years and between sites”
Claim · model-written summary
Nitrogen fertilizer applied all at planting or all at hilling decreased potato tuber yields compared with split N application.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Nitrogen fertilizer applied all at planting or all at hillinge3
- Outcome
- tuber yieldse3
- Direction
- decreasede3
- Comparator
- split N applicatione3
- Setting
- both sitese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e3“Nitrogen fertilizer applied all at planting or all at hilling decreased tuber yields in both sites compared with split N application”
Claim · model-written summary
The percentage of N rate applied at planting that maximized potato marketable tuber yield varied among years from 34 to 61%.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- percentage of N rate applied at planting to achieve the maximum marketable tuber yielde4
- Value
- 34 to 61%e4
- Qualifier
- varied among yearse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e4“The percentage of N rate applied at planting to achieve the maximum marketable tuber yield varied among years from 34 to 61% and allowed a yield increase of 2 to 20%”
Claim · model-written summary
Applying N at planting allowed a potato marketable tuber yield increase of 2 to 20%.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- N rate applied at plantinge4
- Outcome
- marketable tuber yielde4
- Direction
- increasee4
- Value
- 2 to 20%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e4“The percentage of N rate applied at planting to achieve the maximum marketable tuber yield varied among years from 34 to 61% and allowed a yield increase of 2 to 20%”
Claim · model-written summary
The proportion of large potato tubers was higher in the DMZ site, with greater depth to the clayey substratum, than in the SMZ site.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- proportion of large tuberse5
- Direction
- highere5
- Qualifier
- greater depth to the clayey substratume5
- Comparator
- SMZ sitee5
- Setting
- DMZ sitee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e5“The proportion of large tubers was higher in the site with a greater depth to the clayey substratum (DMZ site) than in the site with a shallower depth to the clayey substratum (SMZ site)”
Claim · model-written summary
Tuber yield and tuber N uptake of potato were higher in the SMZ site than in the DMZ site when no fertilizer N was applied.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- no fertilizer N was appliede6
- Outcome
- Tuber yield and tuber N uptakee6
- Direction
- highere6
- Comparator
- DMZ sitee6
- Setting
- SMZ sitee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e6“Tuber yield and tuber N uptake were higher in the SMZ site than in the DMZ site when no fertilizer N was applied”
Claim · model-written summary
Potato tuber yield was more responsive to fertilizer N rate in the DMZ site than in the SMZ site in one year.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- fertilizer N ratee7
- Outcome
- tuber yielde7
- Direction
- more responsivee7
- Qualifier
- in one yeare7
- Comparator
- SMZ sitee7
- Setting
- DMZ sitee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e7“tuber yield was more responsive to fertilizer N rate in the DMZ site than in the SMZ site in one year”
Claim · model-written summary
The differences between the two sites are not sufficient to justify different fertilizer N management for potato.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- different fertilizer N management for the two sitese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e7“these differences are not sufficient to justify different fertilizer N management for the two sites”
Claim · model-written summary
The two sites frequently differed in potato tuber yield, tuber size and specific gravity.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- tuber yield, tuber size and specific gravitye6
- Qualifier
- frequently differede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e6“The two sites frequently differed in terms of tuber yield, tuber size and specific gravity”
Claim · model-written summary
The optimal N rate and N timing for potato were similar in the two sites.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- optimal N rate and N timinge5
- Qualifier
- were similare5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of rate and timing of N fertilizer application on tuber yield, tuber size distribution and tuber specific gravity of potato (Solanum tuberosum L.)”
e5“the optimal N rate and N timing were similar”
Claim · model-written summary
The site differences may justify different potato management practices, such as nutrient management and seedpiece spacing, for chip processing.
- Taxon
- potatoSolanum tuberosume7
- Outcome
- different potato management practicese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“These differences may be sufficiently large to justify different potato management practices (e.g., nutrient management, seedpiece spacing) to optimize potato production for the chip processing market”
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See all 450 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.