Abstract
Summary Three experiments carried out in 3 years (1973–5) which examined the effects of length of sprouting period and temperature of sprouting on growth and yield of three early potato varieties are described. In Home Guard in 1973 at the earliest harvests, tuber yields increased with increase in length and temperature of sprouting period. At later harvests tuber yields decreased with increase in sprouting period especially at the higher temperature (13 rather than 8 °C) and increasing the temperature of sprouting reduced tuber yield. In 1974 length of sprouting period had few effects on yield at any harvest and increasing the temperature increased yields only at the first harvest. In Vanessa cold storage at 3 °C prior to entry to sprouting temperatures induced an earlier onset of sprout growth than continuous exposure to temperatures conducive to sprout growth. Long sprouting periods produced less sprout growth and at the earliest harvest lower tuber yields than all except the shortest period. Judged from the onset of sprout growth increases in length and temperature of sprouting generally increased tuber yields especially at early harvests. In Pentland Javelin sprout growth was very slow and tuber yields at early harvests decreased at both sprouting temperatures if sprouting began after mid-November. At later harvests effects of both factors were small. The implications of differences in the effects of sprouting periods according to variety and, in Home Guard, season, are discussed in relation to the provision of the most desirable sprouting environment and to variety testing. The similarity in the effects of lengthening the sprouting period and of increasing the temperature of sprouting suggest that temperature is the major causal factor in sprout growth and its effect on field growth. Sprouting periods may therefore be measured most accurately by accumulated day degrees > 0 °C and a close relationship between such a scale and tuber yields is demonstrated. The relevance of such scales for advice to growers is discussed. Tuber growth rates for Vanessa and to a lesser extent Home Guard in 1974 were extremely high, in excess of 10 t/ha/week for Vanessa. These high rates were associated with high levels of radiation received by coastal sites in May and June and are discussed in relation to the canopy structure of the varieties.
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Claims 19
Claim · model-written summary
For Home Guard in 1973, longer sprouting periods increased tuber yield at earliest harvests.
- Taxon
- potato
Solanum tuberosumt0 - Material
- Home Guarde0
- Treatment
- increase in lengthe0
- Outcome
- tuber yieldse0
- Direction
- increasede0
- Qualifier
- at the earliest harvestse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Home Guard in 1973 at the earliest harvests, tuber yields increased with increase in length and temperature of sprouting period”
t0“early potato varieties”
Claim · model-written summary
For Home Guard in 1973, higher sprouting temperature increased tuber yield at earliest harvests.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Home Guarde0
- Treatment
- increase in length and temperature of sprouting periode0
- Outcome
- tuber yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Home Guard in 1973 at the earliest harvests, tuber yields increased with increase in length and temperature of sprouting period”
t0“early potato varieties”
Claim · model-written summary
For Home Guard at later harvests, longer sprouting periods reduced tuber yield, especially at 13 °C rather than 8 °C.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Home Guarde1
- Treatment
- increase in sprouting periode0
- Outcome
- tuber yieldse0
- Direction
- decreasede0
- Qualifier
- especially at the higher temperature (13 rather than 8 °C)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At later harvests tuber yields decreased with increase in sprouting period especially at the higher temperature (13 rather than 8 °C)”
e1“In Home Guard in 1973”
t0“early potato varieties”
Claim · model-written summary
For Home Guard at later harvests, increasing sprouting temperature reduced tuber yield.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Home Guarde1
- Treatment
- increasing the temperature of sproutinge0
- Outcome
- tuber yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the temperature of sprouting reduced tuber yield”
e1“In Home Guard in 1973”
t0“early potato varieties”
Claim · model-written summary
In 1974, sprouting-period length had few effects on yield at any harvest.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- length of sprouting periode0
- Outcome
- yielde0
- Direction
- few effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1974 length of sprouting period had few effects on yield at any harvest”
t0“early potato varieties”
Claim · model-written summary
In 1974, higher sprouting temperature increased yield only at the first harvest.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- increasing the temperaturee0
- Outcome
- yieldse0
- Direction
- increasede0
- Qualifier
- only at the first harveste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the temperature increased yields only at the first harvest”
t0“early potato varieties”
Claim · model-written summary
In Vanessa, cold storage at 3 °C led to earlier sprout growth than continuous conducive temperatures.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Vanessae0
- Treatment
- cold storage at 3 °C prior to entry to sprouting temperaturese0
- Outcome
- onset of sprout growthe0
- Direction
- earliere0
- Comparator
- continuous exposure to temperatures conducive to sprout growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Vanessa cold storage at 3 °C prior to entry to sprouting temperatures induced an earlier onset of sprout growth than continuous exposure to temperatures conducive to sprout growth”
t0“early potato varieties”
Claim · model-written summary
In Vanessa, long sprouting periods produced less sprout growth.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Vanessae1
- Treatment
- Long sprouting periodse0
- Outcome
- sprout growthe0
- Direction
- lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Long sprouting periods produced less sprout growth”
e1“In Vanessa”
t0“early potato varieties”
Claim · model-written summary
In Vanessa, long sprouting periods lowered tuber yield at the earliest harvest relative to all but the shortest period.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Vanessae2
- Treatment
- Long sprouting periodse1
- Outcome
- tuber yieldse0
- Direction
- lowere0
- Comparator
- all except the shortest periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the earliest harvest lower tuber yields than all except the shortest period”
e1“Long sprouting periods produced less sprout growth”
e2“In Vanessa”
t0“early potato varieties”
Claim · model-written summary
By onset of sprout growth, longer sprouting generally increased tuber yield, especially early.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- increases in lengthe0
- Outcome
- tuber yieldse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Judged from the onset of sprout growth increases in length and temperature of sprouting generally increased tuber yields especially at early harvests”
t0“early potato varieties”
Claim · model-written summary
By onset of sprout growth, higher sprouting temperature generally increased tuber yield, especially early.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- temperature of sproutinge0
- Outcome
- tuber yieldse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Judged from the onset of sprout growth increases in length and temperature of sprouting generally increased tuber yields especially at early harvests”
t0“early potato varieties”
Claim · model-written summary
For Pentland Javelin, sprout growth was very slow.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Pentland Javeline0
- Outcome
- sprout growth was very slowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Pentland Javelin sprout growth was very slow”
t0“early potato varieties”
Claim · model-written summary
For Pentland Javelin, starting sprouting after mid-November reduced early tuber yield at both temperatures.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Pentland Javeline1
- Treatment
- sprouting began after mid-Novembere0
- Outcome
- tuber yieldse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tuber yields at early harvests decreased at both sprouting temperatures if sprouting began after mid-November”
e1“In Pentland Javelin”
t0“early potato varieties”
Claim · model-written summary
Temperature is suggested as the major cause of sprout growth and its effect on field growth.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- temperaturee0
- Outcome
- sprout growth and its effect on field growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“temperature is the major causal factor in sprout growth and its effect on field growth”
t0“early potato varieties”
Claim · model-written summary
Accumulated day degrees above 0 °C showed a close relationship with tuber yields.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- accumulated day degrees > 0 °Ce1
- Outcome
- tuber yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a close relationship between such a scale and tuber yields is demonstrated”
e1“accumulated day degrees > 0 °C”
t0“early potato varieties”
Claim · model-written summary
Sprouting periods may be measured most accurately using accumulated day degrees above 0 °C.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- measured most accurately by accumulated day degrees > 0 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sprouting periods may therefore be measured most accurately by accumulated day degrees > 0 °C”
t0“early potato varieties”
Claim · model-written summary
Vanessa tuber growth rates exceeded 10 t/ha/week in 1974.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Vanessae0
- Outcome
- Tuber growth ratese0
- Direction
- extremely highe0
- Value
- 10 t/ha/weeke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tuber growth rates for Vanessa and to a lesser extent Home Guard in 1974 were extremely high, in excess of 10 t/ha/week for Vanessa”
t0“early potato varieties”
Claim · model-written summary
Home Guard tuber growth rates were high in 1974, though less than Vanessa.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Home Guarde0
- Outcome
- Tuber growth ratese0
- Direction
- extremely highe0
- Comparator
- Vanessae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tuber growth rates for Vanessa and to a lesser extent Home Guard in 1974 were extremely high”
t0“early potato varieties”
Claim · model-written summary
High tuber growth rates were associated with high May and June radiation at coastal sites.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- Tuber growth ratese1
- Qualifier
- high levels of radiatione0
- Setting
- coastal sitese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These high rates were associated with high levels of radiation received by coastal sites in May and June”
e1“Tuber growth rates for Vanessa and to a lesser extent Home Guard”
t0“early potato varieties”
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See all 13 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.