Abstract
Abstract The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware) were determined using sprinklers in a line‐source design on a Spearwood sand. Irrigation water was applied at 73 to 244% of the daily pan evaporation (Epan) and N at 0 to 800 kg N ha‐1 (total applied) as NH4NO3 in 10 applications post‐planting. There was a significant yield (total and marketable) response to irrigation, at all levels of applied N, and N at all levels of applied water (P<0.001). The interaction between irrigation and N was also significant (P<0.001). There was no significant yield response to irrigation from 149% Epan (i.e., W3 treatment) to 244% Epan (i.e., W6 treatment). Irrigation at 125 and 150% of Epan was required for 95 and 99% of maximum yield, respectively, as determined from fitted Mitscherlich relationships. Critical levels of N required for 95 (417 kg ha‐1) and 99% (703 kg ha‐1) of maximum yield were also determined from a Mitschlerlich relationship fitted to the average of the W3 to W6 treatments. The percent total N and nitrate‐N in petioles of youngest fully expanded leaves required for 95 and 99% of maximum yield was 1.78 and 2.11, respectively, at the 10 mm tuber stage, and 0.25 and 0.80% at the 10mm plus 14 day stage (from quadratic regressions). There was a significant (P≤0.001) increase in N uptake by tubers with level of applied N from 57 kg ha‐1 at 0 kg applied N ha‐1 to 190 kg ha‐1 at 800 kg applied N ha‐1 (from a Mitscherlich relationship fitted to the average of W3 to W6 treatments). After accounting for N uptake from soil reserves (57 kg N ha‐1), apparent recovery efficiency (RE) of fertilizer N by tubers [RE=(Up‐Uo/Np) where Up=uptake of N by the crop, Uo=uptake in absence of applied N and Np is the level of applied N, expressed as a fraction] declined from 0.28 at 100 kg applied N ha‐1 to 0.17 at 800 kg applied N ha‐1. There was a linear increase in ‘after cooking darkening’ (i.e., greying) of tubers with increasing level of applied N. Conversely, ‘sloughing’ (i.e., disintegration) of tubers decreased (inverse polynomial) with increasing level of applied N. Rate of irrigation had no effect on these cooking qualities. Reducing applied irrigation and N from levels required for 99% of maximum yield to levels required for 95% of maximum yield would not lead to a significant reduction in profit. This would increase apparent recovery efficiency of applied N by plants, maintain tuber quality, and reduce the impact of potato production on the water systems of the Swan coastal plain.
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Claims 16
Claim · model-written summary
Irrigation significantly increased total and marketable potato yield at all levels of applied N.
- Taxon
- potatoes
Solanum tuberosume0 - Material
- cv. Delawaree0
- Treatment
- irrigatione1
- Outcome
- yield (total and marketable)e1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e1“There was a significant yield (total and marketable) response to irrigation, at all levels of applied N, and N at all levels of applied water (P<0.001)”
Claim · model-written summary
Applied N significantly affected total and marketable potato yield at all levels of applied water.
- Taxon
- potatoesSolanum tuberosume0
- Material
- cv. Delawaree0
- Treatment
- applied Ne1
- Outcome
- yield (total and marketable)e1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e1“There was a significant yield (total and marketable) response to irrigation, at all levels of applied N, and N at all levels of applied water (P<0.001)”
Claim · model-written summary
The interaction between irrigation and N significantly affected potato yield.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- irrigation and Ne3
- Outcome
- interaction between irrigation and Ne3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e3“The interaction between irrigation and N was also significant (P<0.001)”
Claim · model-written summary
There was no significant yield response to irrigation between 149% and 244% of Epan.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- 244% Epan (i.e., W6 treatment)e2
- Outcome
- yield responsee2
- Direction
- no significante2
- Comparator
- 149% Epan (i.e., W3 treatment)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e2“There was no significant yield response to irrigation from 149% Epan (i.e., W3 treatment) to 244% Epan (i.e., W6 treatment)”
Claim · model-written summary
Irrigation at 125 and 150% of Epan was required for 95 and 99% of maximum potato yield, as determined from fitted Mitscherlich relationships.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- Irrigation at 125 and 150% of Epane4
- Outcome
- maximum yielde4
- Value
- 95 and 99%e4
- Qualifier
- fitted Mitscherlich relationshipse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e4“Irrigation at 125 and 150% of Epan was required for 95 and 99% of maximum yield, respectively, as determined from fitted Mitscherlich relationships”
Claim · model-written summary
Critical N level for 95% of maximum potato yield is 417 kg ha-1.
- Taxon
- potatoesSolanum tuberosume0
- Outcome
- Critical levels of Ne5
- Value
- 417 kg ha‐1e5
- Qualifier
- 95 (417 kg ha‐1)e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e5“Critical levels of N required for 95 (417 kg ha‐1) and 99% (703 kg ha‐1) of maximum yield”
Claim · model-written summary
Critical N level for 99% of maximum potato yield is 703 kg ha-1.
- Taxon
- potatoesSolanum tuberosume0
- Outcome
- Critical levels of Ne5
- Value
- 703 kg ha‐1e5
- Qualifier
- 99% (703 kg ha‐1) of maximum yielde5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e5“Critical levels of N required for 95 (417 kg ha‐1) and 99% (703 kg ha‐1) of maximum yield”
Claim · model-written summary
Total N and nitrate-N in petioles of youngest fully expanded leaves at the 10 mm tuber stage were 1.78 and 2.11 at 95 and 99% of maximum yield.
- Taxon
- potatoesSolanum tuberosume0
- Organ / stage
- petioles of youngest fully expanded leavese6
- Outcome
- percent total N and nitrate‐Ne6
- Value
- 1.78 and 2.11e6
- Qualifier
- at the 10 mm tuber stagee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e6“The percent total N and nitrate‐N in petioles of youngest fully expanded leaves required for 95 and 99% of maximum yield was 1.78 and 2.11, respectively, at the 10 mm tuber stage, and 0.25 and 0.80% at the 10mm plus 14 day stage”
Claim · model-written summary
Total N and nitrate-N in petioles of youngest fully expanded leaves at the 10mm plus 14 day stage were 0.25 and 0.80% at 95 and 99% of maximum yield.
- Taxon
- potatoesSolanum tuberosume0
- Organ / stage
- petioles of youngest fully expanded leavese6
- Outcome
- percent total N and nitrate‐Ne6
- Value
- 0.25 and 0.80%e6
- Qualifier
- at the 10mm plus 14 day stagee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e6“The percent total N and nitrate‐N in petioles of youngest fully expanded leaves required for 95 and 99% of maximum yield was 1.78 and 2.11, respectively, at the 10 mm tuber stage, and 0.25 and 0.80% at the 10mm plus 14 day stage”
Claim · model-written summary
N uptake by tubers increased with applied N, from 57 kg ha-1 at 0 kg applied N to 190 kg ha-1 at 800 kg applied N.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- level of applied Ne7
- Outcome
- N uptake by tuberse7
- Direction
- increasee7
- Value
- 190 kg ha‐1e7
- Comparator
- 0 kg applied N ha‐1e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e7“There was a significant (P≤0.001) increase in N uptake by tubers with level of applied N from 57 kg ha‐1 at 0 kg applied N ha‐1 to 190 kg ha‐1 at 800 kg applied N ha‐1”
Claim · model-written summary
Apparent recovery efficiency of fertilizer N by tubers declined from 0.28 at 100 kg applied N to 0.17 at 800 kg applied N.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- applied Ne2
- Outcome
- apparent recovery efficiency (RE) of fertilizer Ne1
- Direction
- declinede2
- Value
- 0.28 at 100 kg applied N ha‐1 to 0.17 at 800 kg applied N ha‐1e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e1“apparent recovery efficiency (RE) of fertilizer N by tubers”
e2“declined from 0.28 at 100 kg applied N ha‐1 to 0.17 at 800 kg applied N ha‐1”
Claim · model-written summary
Cooking darkening (greying) of tubers increased linearly with increasing applied N.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- increasing level of applied Ne1
- Outcome
- ‘after cooking darkening’ (i.e., greying) of tuberse1
- Direction
- increasee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e1“There was a linear increase in ‘after cooking darkening’ (i.e., greying) of tubers with increasing level of applied N”
Claim · model-written summary
Sloughing (disintegration) of tubers decreased with increasing applied N.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- increasing level of applied Ne1
- Outcome
- ‘sloughing’ (i.e., disintegration) of tuberse1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e1“‘sloughing’ (i.e., disintegration) of tubers decreased (inverse polynomial) with increasing level of applied N”
Claim · model-written summary
Rate of irrigation had no effect on cooking qualities of potato tubers.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- Rate of irrigatione1
- Outcome
- cooking qualitiese1
- Direction
- no effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e1“Rate of irrigation had no effect on these cooking qualities”
Claim · model-written summary
Reducing irrigation and N from the levels required for 99% to those required for 95% of maximum yield would not significantly reduce potato profit.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- Reducing applied irrigation and Ne1
- Outcome
- profite1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigation and nitrogen (N) requirements of potatoes (cv. Delaware)”
e1“Reducing applied irrigation and N from levels required for 99% of maximum yield to levels required for 95% of maximum yield would not lead to a significant reduction in profit”
Claim · model-written summary
Using the 95% levels would increase apparent recovery efficiency of applied N by potato plants, maintain tuber quality and reduce water-system impact in the Swan coastal plain.
- Taxon
- potatoSolanum tuberosume1
- Outcome
- apparent recovery efficiency of applied N by plantse1
- Setting
- Swan coastal plaine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This would increase apparent recovery efficiency of applied N by plants, maintain tuber quality, and reduce the impact of potato production on the water systems of the Swan coastal plain”
The same questions in other papers
nitrogen · quality: postharvest · Solanum tuberosum (potato)Positive and negative results
22 papers in the same direction as this paper · 3 in the opposite direction · 2 reporting no difference from an alternative
- negative
- negative
- no effect
24 papers more in this group
See all 28 papers →irrigation · quality: postharvest · Solanum tuberosum (potato)Results agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
See all 7 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.