Abstract
SUMMARY Three experiments, carried out in 3 years (1972–5), which examined the effects of a wide range of rates of nitrogen fertilizer applied to seed crops of Home Guard on seed and progeny crop growth are reported. There was little effect of increasing rate of N application over the range 0–300 kg/ha on seed yield, and the results suggested that very low rates of nitrogen fertilizer (< 75 kg/ha) were required for maximum seed yield in mid-Wales. Increasing the rate of nitrogen fertilizer above 304 kg/ha delayed growth and decreased yield in seed crops. Although increasing the rate of nitrogen fertilizer in seed crops delayed senescence and increased the nitrogen concentration of tubers, there were few consistent effects on sprouting or growth of progeny crops. Close negatively quadratic relationships were found between the dry-matter content of tubers and their size. The dry-matter content of all sizes of tubers increased during growth, but there were no effects of nitrogen on dry-matter content.
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Claims 10
Claim · model-written summary
Increasing nitrogen rate from 0 to 300 kg/ha had little effect on seed yield of potatoes.
- Taxon
- potatoes
Solanum tuberosumt0 - Material
- Home Guarde2
- Treatment
- increasing rate of N application over the range 0–300 kg/hae1
- Outcome
- seed yielde1
- Direction
- little effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“There was little effect of increasing rate of N application over the range 0–300 kg/ha on seed yield”
e2“seed crops of Home Guard”
t0“in potatoes”
Claim · model-written summary
Very low nitrogen rates (below 75 kg/ha) were required for maximum seed yield in mid-Wales.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- very low rates of nitrogen fertilizer (< 75 kg/ha)e2
- Outcome
- maximum seed yielde2
- Direction
- required for maximume2
- Setting
- mid-Walese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“very low rates of nitrogen fertilizer (< 75 kg/ha) were required for maximum seed yield in mid-Wales”
t0“in potatoes”
Claim · model-written summary
Nitrogen above 304 kg/ha delayed growth of potato seed crops.
- Taxon
- potatoesSolanum tuberosumt0
- Organ / stage
- seed cropse3
- Treatment
- rate of nitrogen fertilizer above 304 kg/hae3
- Outcome
- growthe3
- Direction
- delayede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Increasing the rate of nitrogen fertilizer above 304 kg/ha delayed growth and decreased yield in seed crops”
t0“in potatoes”
Claim · model-written summary
Nitrogen above 304 kg/ha decreased yield of potato seed crops.
- Taxon
- potatoesSolanum tuberosumt0
- Organ / stage
- seed cropse3
- Treatment
- rate of nitrogen fertilizer above 304 kg/hae3
- Outcome
- yielde3
- Direction
- decreasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Increasing the rate of nitrogen fertilizer above 304 kg/ha delayed growth and decreased yield in seed crops”
t0“in potatoes”
Claim · model-written summary
Increasing nitrogen in seed crops delayed senescence of potatoes.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- increasing the rate of nitrogen fertilizer in seed cropse4
- Outcome
- senescencee4
- Direction
- delayede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“increasing the rate of nitrogen fertilizer in seed crops delayed senescence and increased the nitrogen concentration of tubers”
t0“in potatoes”
Claim · model-written summary
Increasing nitrogen in seed crops increased the nitrogen concentration of potato tubers.
- Taxon
- potatoesSolanum tuberosumt0
- Organ / stage
- tuberse4
- Treatment
- increasing the rate of nitrogen fertilizer in seed cropse4
- Outcome
- nitrogen concentration of tuberse4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“increasing the rate of nitrogen fertilizer in seed crops delayed senescence and increased the nitrogen concentration of tubers”
t0“in potatoes”
Claim · model-written summary
Nitrogen in seed crops had few consistent effects on sprouting or growth of progeny crops.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- increasing the rate of nitrogen fertilizer in seed cropse4
- Outcome
- sprouting or growth of progeny cropse5
- Direction
- few consistent effectse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“increasing the rate of nitrogen fertilizer in seed crops delayed senescence and increased the nitrogen concentration of tubers”
e5“there were few consistent effects on sprouting or growth of progeny crops”
t0“in potatoes”
Claim · model-written summary
Dry-matter content and tuber size of potatoes showed close negatively quadratic relationships.
- Taxon
- potatoesSolanum tuberosumt0
- Organ / stage
- tuberse6
- Outcome
- dry-matter content of tubers and their sizee6
- Direction
- negatively quadratice6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Close negatively quadratic relationships were found between the dry-matter content of tubers and their size”
t0“in potatoes”
Claim · model-written summary
Dry-matter content of all tuber sizes of potatoes increased during growth.
- Taxon
- potatoesSolanum tuberosumt0
- Organ / stage
- tuberse7
- Outcome
- dry-matter content of all sizes of tuberse7
- Direction
- increasede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The dry-matter content of all sizes of tubers increased during growth”
t0“in potatoes”
Claim · model-written summary
Nitrogen had no effect on dry-matter content of potato tubers.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- nitrogene7
- Outcome
- dry-matter contente7
- Direction
- no effectse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“there were no effects of nitrogen on dry-matter content”
t0“in potatoes”
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