Abstract
The efficiency of 15 N-labelled fertilizer on early harvested potaotes (Solanum tuberosum L., 'Norland') was studied in field experiments on two soil series (Saint-Damase loamy sand and Soulanges sandy loam) during a 2-yr period. The 15 NH 4 15 NO 3 fertilizer was band applied at 0 and 140 kg N ha −1 in 1985 and 0, 70, 140 kg ha −1 in 1986 and four harvests were made during the growing season. The foliage was in full canopy development at 65 or 75 d and its dry matter yield increased significantly with the application of fertilizer-N. At this time about 70% of the total N uptake was in the foliage. From this peak, foliage N decreased gradually with time to about 28% at 95 or 100 d as N was transferred to the tubers. The N concentration in tubers was nearly constant during the growing season. As tuber dry matter increased at each successive harvest, N uptake increased proportionally. Between the first two harvest dates, from 65 to 75 d, the average rates of N accumulation in tubers were 2.1 and 4.5 kg N ha −1 d −1 for the control and N fertilized plot, respectively. The root dry matter and N concentration increased with fertilizer-N and were generally lowest on the final harvest day. Marketable tuber yield responded to N fertilization on the severely N-deficient fields in 1985. But in 1986, the 140 kg N ha −1 treatment delayed the growth of marketable tubers. The percentage of N derived from fertilizer (Ndff) was also very high in 1985 fields and was at a maximum at 65 d (64–69%) with the 140 kg N ha −1 treatment. These values were lower for the same treatments in 1986 fields (39%) because of the larger amounts of available N in soils. The maximum coefficient of utilization (ICU) of labelled fertilizer N was 72–76% in 1985 and 63–68% in 1986. At the final harvest, about 36–50% of the applied fertilizer-N was found in the tubers. Key words: Nitrogen fertilization, 15 N-labelled fertilizer, N use efficiency, harvest periods, potato
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Claims 12
Claim · model-written summary
Fertilizer-N application significantly increased the dry matter yield of potato foliage.
- Taxon
- Solanum tuberosum
Solanum tuberosume0 - Organ / stage
- foliagee1
- Treatment
- fertilizer-Ne1
- Outcome
- dry matter yielde1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e1“The foliage was in full canopy development at 65 or 75 d and its dry matter yield increased significantly with the application of fertilizer-N”
Claim · model-written summary
About 70% of total potato N uptake was in the foliage at full canopy development.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Organ / stage
- foliagee2
- Outcome
- total N uptakee2
- Value
- 70%e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e2“At this time about 70% of the total N uptake was in the foliage”
Claim · model-written summary
Foliage N decreased to about 28% at 95 or 100 days as N was transferred to the tubers.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Organ / stage
- foliagee3
- Outcome
- foliage Ne3
- Direction
- decreasede3
- Value
- 28%e3
- Qualifier
- at 95 or 100 de3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e3“From this peak, foliage N decreased gradually with time to about 28% at 95 or 100 d as N was transferred to the tubers”
Claim · model-written summary
The N concentration in potato tubers was nearly constant during the growing season.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Organ / stage
- tuberse4
- Outcome
- N concentratione4
- Direction
- nearly constante4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e4“The N concentration in tubers was nearly constant during the growing season”
Claim · model-written summary
Between 65 and 75 days, N accumulation in tubers was 4.5 kg N ha-1 d-1 in the N fertilized plot compared with 2.1 kg N ha-1 d-1 in the control.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Treatment
- N fertilized plote5
- Outcome
- rates of N accumulation in tuberse5
- Value
- 4.5 kg N ha −1 d −1e5
- Qualifier
- from 65 to 75 de5
- Comparator
- controle5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e5“Between the first two harvest dates, from 65 to 75 d, the average rates of N accumulation in tubers were 2.1 and 4.5 kg N ha −1 d −1 for the control and N fertilized plot, respectively”
Claim · model-written summary
N fertilization affected marketable tuber yield on severely N-deficient fields in 1985.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Treatment
- N fertilizatione6
- Outcome
- Marketable tuber yielde6
- Direction
- respondede6
- Qualifier
- on the severely N-deficient fields in 1985e6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e6“Marketable tuber yield responded to N fertilization on the severely N-deficient fields in 1985”
Claim · model-written summary
The 140 kg N ha-1 treatment delayed the growth of marketable tubers in 1986.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Treatment
- 140 kg N ha −1e7
- Outcome
- growth of marketable tuberse7
- Direction
- delayede7
- Qualifier
- in 1986e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e7“But in 1986, the 140 kg N ha −1 treatment delayed the growth of marketable tubers”
Claim · model-written summary
The percentage of N derived from fertilizer (Ndff) was at a maximum of 64-69% at 65 days with 140 kg N ha-1 in 1985.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Treatment
- 140 kg N ha −1e7
- Outcome
- percentage of N derived from fertilizer (Ndff)e7
- Direction
- maximume7
- Value
- 64–69%e7
- Setting
- 1985 fieldse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e7“The percentage of N derived from fertilizer (Ndff) was also very high in 1985 fields and was at a maximum at 65 d (64–69%) with the 140 kg N ha −1 treatment”
Claim · model-written summary
The percentage of N derived from fertilizer (Ndff) was lower in 1986 fields (39%).
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Outcome
- percentage of N derived from fertilizer (Ndff)e7
- Direction
- lowere6
- Value
- 39%e6
- Setting
- 1986 fieldse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e7“The percentage of N derived from fertilizer (Ndff) was also very high in 1985 fields and was at a maximum at 65 d (64–69%) with the 140 kg N ha −1 treatment”
e6“These values were lower for the same treatments in 1986 fields (39%)”
Claim · model-written summary
The maximum coefficient of utilization of labelled fertilizer N was 72-76% in 1985.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Outcome
- coefficient of utilization (ICU) of labelled fertilizer Ne7
- Direction
- maximume7
- Value
- 72–76%e7
- Setting
- 1985e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e7“The maximum coefficient of utilization (ICU) of labelled fertilizer N was 72–76% in 1985 and 63–68% in 1986”
Claim · model-written summary
The maximum coefficient of utilization of labelled fertilizer N was 63-68% in 1986.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Outcome
- coefficient of utilization (ICU) of labelled fertilizer Ne7
- Direction
- maximume7
- Value
- 63–68%e7
- Setting
- 1986e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e7“The maximum coefficient of utilization (ICU) of labelled fertilizer N was 72–76% in 1985 and 63–68% in 1986”
Claim · model-written summary
At the final harvest, about 36-50% of the applied fertilizer-N was found in the tubers.
- Taxon
- Solanum tuberosumSolanum tuberosume0
- Outcome
- applied fertilizer-N was found in the tuberse6
- Value
- 36–50%e6
- Qualifier
- At the final harveste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early harvested potaotes (Solanum tuberosum L., 'Norland')”
e6“At the final harvest, about 36–50% of the applied fertilizer-N was found in the tubers”
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