Abstract
Nut production from nursery-run black walnuts grown on 225 acres at the Hammons Products Company's Sho-Neff Black Walnut Farm in Stockton, MO, was evaluated from 1995 to 2010 to determine if nut production increased after thinning and fertilization in 2001. The farm consists of 11 upland and 10 bottomland plantings on sites ranging from unsuitable to well suited for growth of walnut. All 21 stands were thinned in 2001, removing about one-third of the trees, and fertilized with 60, 20, and 60 pounds per acre of nitrogen, phosphorus, and potassium, respectively. Nine stands were limed to raise pH to 5.5 or higher. Five stands received an additional spring and fall application of nitrogen. Milled walnut shells and husk waste were periodically applied to 11 stands. Hay was harvested between rows 40 feet apart both before and after thinning and fertilization. Nut production increased on average 20 pounds per acre with one-third fewer trees over the 9-year post-treatment period compared to the 7-year pretreatment period. The modest gain in nut production suggests that competition between trees and low soil nutrients were not the major factors limiting nut production. These results cause us to wonder: can a grower expect early economic returns from nut production on an investment made in the culture of young black walnut from nursery-run or unimproved seedlings?
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Claims 2
Claim · model-written summary
Nut production rose on average 20 pounds per acre after thinning and fertilization, despite one-third fewer trees.
- Taxon
- black walnuts
Juglans nigrat0 - Treatment
- thinning and fertilizationt1
- Outcome
- Nut productione0
- Direction
- increasede0
- Value
- 20 pounds per acree0
- Qualifier
- one-third fewer treese0
- Comparator
- 7-year pretreatment periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nut production increased on average 20 pounds per acre with one-third fewer trees over the 9-year post-treatment period compared to the 7-year pretreatment period”
t0“black walnuts”
t1“thinning and fertilization”
Claim · model-written summary
The modest production gain suggests tree competition and low soil nutrients were not the main limits on nut output.
- Taxon
- black walnutsJuglans nigrat0
- Outcome
- nut productione0
- Qualifier
- competition between trees and low soil nutrientse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The modest gain in nut production suggests that competition between trees and low soil nutrients were not the major factors limiting nut production.”
t0“black walnuts”
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
- positive
- no effect
- 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.