Abstract
We examined growth and nitrogen (N), phosphorus (P), potassium (K), and microelement nutrition of grafted black walnut ( Juglans nigra L.) seedlings exposed to increasing nutrient supply and grown in the greenhouse for 18 week. Plants were potted and grafted within the first 4 week, then fertigated once each week for a 7-week period with a varying nutrient solution of 20N–4.4P–16.6K that delivered 0, 1160, 2320, and 4620 mg N/plant. Plants were harvested at week 18. There was a positive mean growth response to increased fertilization, although trends were statistically similar across treatments. Leaf nutrient concentration ranged from 22 to 31 g · kg –1 N, 5 to 14 g · kg –1 P, and 19 to 25 g · kg –1 K. The 2320 mg N/plant treatment increased leaf nutrient content 18% to 86% for N, 33% to 303% for P, and 23% to 58% for K compared with the control. Nitrogen efficiency decreased with increased N supply. Increased nutrient retention in the growing medium at higher fertility suggests root plugs could serve as immediate critical nutrient sources for grafted black walnut seedlings after outplanting. Study results suggests nursery fertilization can be used to improve the nutritional quality of grafted black walnut as well as store nutrients in root plugs for later utilization to benefit early establishment success.
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Claims 11
Claim · model-written summary
Growth tended to rise with fertilization, but treatments were statistically similar.
- Treatment
- increased fertilizatione0
- Outcome
- mean growth responsee0
- Direction
- positivee0
- Qualifier
- trends were statistically similare0
- Comparator
- across treatmentse0
Not reportedTaxon
Verbatim
e0“There was a positive mean growth response to increased fertilization, although trends were statistically similar across treatments.”
Claim · model-written summary
Leaf nitrogen concentration ranged from 22 to 31 g · kg –1.
Not reportedTaxon
Verbatim
e0“Leaf nutrient concentration ranged from 22 to 31 g · kg –1 N, 5 to 14 g · kg –1 P, and 19 to 25 g · kg –1 K.”
Claim · model-written summary
Leaf phosphorus concentration ranged from 5 to 14 g · kg –1.
Not reportedTaxon
Verbatim
e0“Leaf nutrient concentration ranged from 22 to 31 g · kg –1 N, 5 to 14 g · kg –1 P, and 19 to 25 g · kg –1 K.”
Claim · model-written summary
Leaf potassium concentration ranged from 19 to 25 g · kg –1.
Not reportedTaxon
Verbatim
e0“Leaf nutrient concentration ranged from 22 to 31 g · kg –1 N, 5 to 14 g · kg –1 P, and 19 to 25 g · kg –1 K.”
Claim · model-written summary
The 2320 mg N/plant treatment increased leaf nitrogen content by 18% to 86% relative to the control.
- Treatment
- 2320 mg N/plant treatmente0
- Outcome
- Ne0
- Direction
- increasede0
- Value
- 18% to 86%e0
- Comparator
- the controle0
Not reportedTaxon
Verbatim
e0“The 2320 mg N/plant treatment increased leaf nutrient content 18% to 86% for N, 33% to 303% for P, and 23% to 58% for K compared with the control.”
Claim · model-written summary
The 2320 mg N/plant treatment increased leaf phosphorus content by 33% to 303% relative to the control.
- Treatment
- 2320 mg N/plant treatmente0
- Outcome
- Pe0
- Direction
- increasede0
- Value
- 33% to 303%e0
- Comparator
- the controle0
Not reportedTaxon
Verbatim
e0“The 2320 mg N/plant treatment increased leaf nutrient content 18% to 86% for N, 33% to 303% for P, and 23% to 58% for K compared with the control.”
Claim · model-written summary
The 2320 mg N/plant treatment increased leaf potassium content by 23% to 58% relative to the control.
- Treatment
- 2320 mg N/plant treatmente0
- Outcome
- Ke0
- Direction
- increasede0
- Value
- 23% to 58%e0
- Comparator
- the controle0
Not reportedTaxon
Verbatim
e0“The 2320 mg N/plant treatment increased leaf nutrient content 18% to 86% for N, 33% to 303% for P, and 23% to 58% for K compared with the control.”
Claim · model-written summary
Nitrogen efficiency decreased as nitrogen supply increased.
Not reportedTaxon
Verbatim
e0“Nitrogen efficiency decreased with increased N supply.”
Claim · model-written summary
More nutrients remained in the growing medium at higher fertility.
- Taxon
- black walnut
Juglans nigrae0 - Treatment
- higher fertilitye0
- Outcome
- nutrient retention in the growing mediume0
- Direction
- Increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased nutrient retention in the growing medium at higher fertility suggests root plugs could serve as immediate critical nutrient sources for grafted black walnut seedlings after outplanting.”
Claim · model-written summary
The authors suggest root plugs could provide nutrients after outplanting.
- Taxon
- black walnutJuglans nigrae0
- Outcome
- root plugs could serve as immediate critical nutrient sourcese0
- Qualifier
- after outplantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root plugs could serve as immediate critical nutrient sources for grafted black walnut seedlings after outplanting.”
Claim · model-written summary
The authors suggest nursery fertilization to improve nutritional quality and store nutrients in root plugs for establishment.
- Taxon
- black walnutJuglans nigrae0
- Outcome
- nursery fertilization can be used to improve the nutritional quality of grafted black walnut as well as store nutrients in root plugse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Study results suggests nursery fertilization can be used to improve the nutritional quality of grafted black walnut as well as store nutrients in root plugs for later utilization to benefit early establishment success.”
The same questions in other papers
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.