Abstract
Summary Three experiments involving three early maincrop cultivars explored the effect of nitrogen fertilizer (0–301 kg N/ha) applied to seed potato crops on seed performance and the growth of the subsequent early ware crop. The tuber N-content ranged from 1·1 g N/100 g dry matter (D.M.) to 1·6 g N/100 g D.M. for seed tubers obtained from crops grown at 0 and 201·301 kg N/ha. Seed of cv. Maris Peer from crops given 100 kg N/ha in 1969 produced ware yields 10% and 24% higher than those obtained from seed from crops given 0 and 201 kg N/ha. No effects of fertilizer applied to the seed crop on subsequent growth were observed in the other two experiments. It is suggested that the effects of nitrogen fertilizer applied to the seed crop on subsequent growth other than that related to seed tuber size only arise as a result of effects on the maturity of the seed crop. Thus any observed effect is attributed to differences in the ‘physiological age’ of seed rather than to differences in seed tuber N-reserves.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Seed tuber nitrogen ranged from 1·1 to 1·6 g N/100 g dry matter across fertilizer rates.
- Taxon
- potatoes
Solanum tuberosumt0 - Organ / stage
- seed tuberse0
- Outcome
- tuber N-contente0
- Value
- 1·1 g N/100 g dry matter (D.M.) to 1·6 g N/100 g D.M.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tuber N-content ranged from 1·1 g N/100 g dry matter (D.M.) to 1·6 g N/100 g D.M. for seed tubers obtained from crops grown at 0 and 201·301 kg N/ha.”
t0“potatoes”
Claim · model-written summary
Maris Peer seed from 100 kg N/ha crops yielded 10% more than seed from 0 kg N/ha crops.
- Taxon
- potatoesSolanum tuberosumt0
- Material
- Maris Peere0
- Treatment
- 100 kg N/hae0
- Outcome
- ware yieldse0
- Direction
- highere0
- Value
- 10%e0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of cv. Maris Peer from crops given 100 kg N/ha in 1969 produced ware yields 10% and 24% higher than those obtained from seed from crops given 0 and 201 kg N/ha.”
t0“potatoes”
Claim · model-written summary
Maris Peer seed from 100 kg N/ha crops yielded 24% more than seed from 201 kg N/ha crops.
- Taxon
- potatoesSolanum tuberosumt0
- Material
- Maris Peere0
- Treatment
- 100 kg N/hae0
- Outcome
- ware yieldse0
- Direction
- highere0
- Value
- 24%e0
- Comparator
- 201 kg N/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of cv. Maris Peer from crops given 100 kg N/ha in 1969 produced ware yields 10% and 24% higher than those obtained from seed from crops given 0 and 201 kg N/ha.”
t0“potatoes”
Claim · model-written summary
Fertilizer on the seed crop showed no subsequent growth effect in the other two experiments.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- fertilizer applied to the seed crope0
- Outcome
- subsequent growthe0
- Direction
- No effectse0
- Qualifier
- other two experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No effects of fertilizer applied to the seed crop on subsequent growth were observed in the other two experiments.”
t0“potatoes”
Claim · model-written summary
The authors suggest that seed crop nitrogen effects on later growth arise through altered maturity or physiological age.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- nitrogen fertilizer applied to the seed crope0
- Outcome
- effects of nitrogen fertilizer applied to the seed crop on subsequent growthe0
- Qualifier
- effects on the maturity of the seed crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is suggested that the effects of nitrogen fertilizer applied to the seed crop on subsequent growth other than that related to seed tuber size only arise as a result of effects on the maturity of the seed crop.”
t0“potatoes”
Claim · model-written summary
The authors attribute observed later growth effects to physiological age rather than seed tuber nitrogen reserves.
- Taxon
- potatoesSolanum tuberosumt0
- Outcome
- any observed effecte0
- Qualifier
- differences in the ‘physiological age’ of seed rather than to differences in seed tuber N-reservese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus any observed effect is attributed to differences in the ‘physiological age’ of seed rather than to differences in seed tuber N-reserves.”
t0“potatoes”
The same questions in other papers
nitrogen · yield · Solanum tuberosum (potato)Results differ
108 papers in the same direction as this paper · 20 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- negative
- negative
128 papers more in this group
See all 132 papers →fertilization · growth · Solanum tuberosum (potato)Positive and negative results
17 papers in the same direction as this paper · 122 in the opposite direction
- positive
- positive
- positive
136 papers more in this group
See all 140 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.