Abstract
Nut production and diameter growth at breast height of black walnut (Juglans nigra L.) were measured for 5 years to determine the effect of nitrogen (N) and potassium (K) fertilization separately, in combination, and with and without phosphorus (P) broadcast annually for 4 years at two rates. Fertilization significantly (P>0.05) increased nut production and diameter growth. Treatments containing P with N and/or K were most effective for increasing nut production, and treatments containing N were most effective for increasing diameter growth. Doubling the rate of application did not cause a corresponding increase in nut production or diameter growth. Leaf levels of N, P, and K were within the adequate range, and the addition of N increased leaf N, but not P and K. The alternate bearing tendency that was present in year 3 of the study was not apparent in years 4 and 5.
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Claims 10
Claim · model-written summary
Fertilization increased black walnut nut production.
- Taxon
- black walnut
Juglans nigrae1 - Treatment
- Fertilizatione0
- Outcome
- nut productione0
- Direction
- increasede0
- Qualifier
- P>0.05e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization significantly (P>0.05) increased nut production and diameter growth.”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Fertilization increased black walnut diameter growth.
- Taxon
- black walnutJuglans nigrae1
- Treatment
- Fertilizatione0
- Outcome
- diameter growthe0
- Direction
- increasede0
- Qualifier
- P>0.05e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization significantly (P>0.05) increased nut production and diameter growth.”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Treatments containing P with N and/or K were most effective at increasing nut production.
- Taxon
- black walnutJuglans nigrae1
- Treatment
- Treatments containing P with N and/or Ke0
- Outcome
- nut productione0
- Direction
- most effective for increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments containing P with N and/or K were most effective for increasing nut production”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Treatments containing N were most effective at increasing diameter growth.
- Taxon
- black walnutJuglans nigrae1
- Treatment
- treatments containing Ne0
- Outcome
- diameter growthe0
- Direction
- most effective for increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatments containing N were most effective for increasing diameter growth.”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Doubling the fertilizer application rate did not yield a corresponding increase in nut production or diameter growth.
- Taxon
- black walnutJuglans nigrae1
- Treatment
- Doubling the rate of applicatione0
- Outcome
- nut production or diameter growthe0
- Direction
- did not cause a corresponding increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Doubling the rate of application did not cause a corresponding increase in nut production or diameter growth.”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Leaf N, P, and K levels were within the adequate range.
- Taxon
- black walnutJuglans nigrae1
- Organ / stage
- Leafe0
- Outcome
- levels of N, P, and Ke0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf levels of N, P, and K were within the adequate range”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Adding N increased leaf N.
- Taxon
- black walnutJuglans nigrae1
- Treatment
- addition of Ne0
- Outcome
- leaf Ne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of N increased leaf N, but not P and K.”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Adding N did not increase leaf P or K.
- Taxon
- black walnutJuglans nigrae1
- Treatment
- addition of Ne0
- Outcome
- P and Ke0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of N increased leaf N, but not P and K.”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Alternate bearing was present in study year 3.
- Taxon
- black walnutJuglans nigrae1
- Outcome
- alternate bearing tendencye0
- Qualifier
- year 3e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The alternate bearing tendency that was present in year 3 of the study”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
Claim · model-written summary
Alternate bearing was not apparent in study years 4 and 5.
- Taxon
- black walnutJuglans nigrae1
- Outcome
- alternate bearing tendencye0
- Qualifier
- years 4 and 5e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The alternate bearing tendency that was present in year 3 of the study was not apparent in years 4 and 5.”
e1“black walnut (Juglans nigra L.) were measured for 5 years”
The same questions in other papers
fertilization · yield · Juglans nigra (black walnut)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
fertilization · growth · Juglans nigra (black walnut)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.