Abstract
SUMMARY The two experiments described here were the 3rd and 4th in a series of experiments investigating the effect of time of application of nitrogen and potassium on the growth and yield of potatoes. The effect of applying all the fertilizer nitrogen in the seed bed was compared with applying all the nitrogen at the time of tuber initiation or dividing the dressing between these times. Similar times of application were tested for potassium. CCC was applied after a leaf area index of 3 had been reached (on all but the no N treatments) in order to offset the tendency for late nitrogen to increase stem growth, but to avoid any tendency for CCC to depress yield by reducing leaf area indices (L) below an assumed optimum value of 3. These treatments were applied in separate experiments to a second early variety (Craig's Royal) and a maincrop variety (Pentland Dell), planted a month later. In both crops the response to nitrogen was large and delaying or splitting the application of nitrogen increased tuber yield compared with nitrogen applied in the seed bed. Responses to potassium were small, but there was a tendency for split applications to be superior to late or early applications. The beneficial effect of delayed or split applications of nitrogen was associated with an improvement in the recovery of nitrogen in the crop which was largely ascribed to a reduction in loss due to leaching. Total and tuber dry-matter yields were linearly related to leaf area duration (D) in both crops, although the earlier variety was more efficient per unit of D. High values of L (6) were recorded for both crops, but there was no indication of an optimal value of L; consequently CCC which reduced L also reduced yield. D was closely related to the maximum quantity of nitrogen accumulated in the leaves per unit area of ground.
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Claims 9
Claim · model-written summary
Delayed or split nitrogen application increased tuber yield versus seed bed application.
- Taxon
- potatoes
Solanum tuberosumt0 - Treatment
- delaying or splitting the application of nitrogene0
- Outcome
- tuber yielde0
- Direction
- increasede0
- Comparator
- nitrogen applied in the seed bede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“delaying or splitting the application of nitrogen increased tuber yield compared with nitrogen applied in the seed bed”
t0“potatoes”
Claim · model-written summary
Potassium responses were small and split application tended to outperform early or late application.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- split applicationse0
- Outcome
- Responses to potassiume0
- Direction
- superiore0
- Comparator
- late or early applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Responses to potassium were small, but there was a tendency for split applications to be superior to late or early applications”
t0“potatoes”
Claim · model-written summary
Delayed or split nitrogen improved crop nitrogen recovery, attributed to less leaching.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- delayed or split applications of nitrogene0
- Outcome
- recovery of nitrogen in the crope0
- Direction
- improvemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“beneficial effect of delayed or split applications of nitrogen was associated with an improvement in the recovery of nitrogen in the crop which was largely ascribed to a reduction in loss due to leaching”
t0“potatoes”
Claim · model-written summary
Total dry matter yield was linearly related to leaf area duration.
- Taxon
- potatoesSolanum tuberosumt0
- Organ / stage
- leaf area duratione0
- Outcome
- Total and tuber dry-matter yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total and tuber dry-matter yields were linearly related to leaf area duration (D) in both crops”
t0“potatoes”
Claim · model-written summary
The earlier potato variety produced more dry matter per unit leaf area duration.
- Taxon
- potatoesSolanum tuberosumt0
- Material
- earlier varietye0
- Outcome
- efficient per unit of De0
- Direction
- moree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the earlier variety was more efficient per unit of D”
t0“potatoes”
Claim · model-written summary
Both crops reached leaf area index 6 without an indicated optimum.
- Taxon
- potatoesSolanum tuberosumt0
- Outcome
- High values of Le0
- Value
- 6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High values of L (6) were recorded for both crops, but there was no indication of an optimal value of L”
t0“potatoes”
Claim · model-written summary
CCC reduced leaf area index and yield.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- CCCe0
- Outcome
- Le0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CCC which reduced L also reduced yield”
t0“potatoes”
Claim · model-written summary
CCC reduced potato yield.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- CCCe0
- Outcome
- yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CCC which reduced L also reduced yield”
t0“potatoes”
Claim · model-written summary
Leaf area duration closely related to maximum leaf nitrogen accumulated per ground area.
- Taxon
- potatoesSolanum tuberosumt0
- Organ / stage
- leavese0
- Outcome
- maximum quantity of nitrogen accumulated in the leaves per unit area of grounde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“D was closely related to the maximum quantity of nitrogen accumulated in the leaves per unit area of ground”
t0“potatoes”
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See all 132 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.