Abstract
A planting of sawdust-mulched highbush blueberries (cv. Bluecrop) was established on a Captina silt loam at the Univ. of Arkansas Research and Extension Center, Fayetteville, in 1994. Nitrogen rate and method of delivery treatments were begun that year and continued through the first two fruiting years (1996 and 1997). Rates included 0, 67, 134, 201, and 268 kg·ha -1 N using ammonium sulfate during the fruiting years (one-half and two-thirds these rates in 1994 and 1995, respectively), and methods of delivery included dry, surface-applied, and fertigation. Total N for the year was applied in three applications for the dry application and in 12 applications using fertigation. Neither yield nor berry mass were statistically significantly affected by N rate or method of delivery. Also, method of delivery had little effect on foliar levels of any macro- and microelements. Rate of N influenced foliar N most years, with the highest N rate increasing foliar N the greatest. The N rate required to consistently achieve adequate foliar N levels (minimum of 1.6% N) was 134 kg·ha -1 . Foliar levels >2.0% were common with the two highest N rates. Foliar Mg and Mn were also influenced by N rate, with the lowest Mg level found for the highest N rate, while excess foliar Mn (800 to 100 ppm) was common with the higher N rates in 1997.
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Claims 7
Claim · model-written summary
Nitrogen rate and delivery did not significantly affect yield or berry mass.
- Taxon
- Highbush Blueberry
Vaccinium corymbosumt0 - Treatment
- N rate or method of deliverye0
- Outcome
- yield nor berry masse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither yield nor berry mass were statistically significantly affected by N rate or method of delivery”
t0“Highbush Blueberry”
Claim · model-written summary
Delivery method had little effect on foliar elements.
- Taxon
- Highbush BlueberryVaccinium corymbosumt0
- Treatment
- method of deliverye0
- Outcome
- foliar levels of any macro- and microelementse0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“method of delivery had little effect on foliar levels of any macro- and microelements”
t0“Highbush Blueberry”
Claim · model-written summary
Highest N rate increased foliar N the most.
- Taxon
- Highbush BlueberryVaccinium corymbosumt0
- Treatment
- highest N ratee0
- Outcome
- foliar Ne0
- Direction
- increasinge0
- Qualifier
- most yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rate of N influenced foliar N most years, with the highest N rate increasing foliar N the greatest”
t0“Highbush Blueberry”
Claim · model-written summary
A rate of 134 kg·ha -1 achieved adequate foliar N.
- Taxon
- Highbush BlueberryVaccinium corymbosumt0
- Treatment
- 134 kg·ha -1e0
- Outcome
- adequate foliar N levelse0
- Value
- minimum of 1.6% Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N rate required to consistently achieve adequate foliar N levels (minimum of 1.6% N) was 134 kg·ha -1”
t0“Highbush Blueberry”
Claim · model-written summary
Two highest N rates commonly gave foliar N above 2%.
- Taxon
- Highbush BlueberryVaccinium corymbosumt0
- Treatment
- two highest N ratese0
- Outcome
- Foliar levelse0
- Value
- >2.0%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar levels >2.0% were common with the two highest N rates”
t0“Highbush Blueberry”
Claim · model-written summary
Highest N rate produced the lowest foliar Mg.
- Taxon
- Highbush BlueberryVaccinium corymbosumt0
- Treatment
- highest N ratee0
- Outcome
- Mg levele0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar Mg and Mn were also influenced by N rate, with the lowest Mg level found for the highest N rate”
t0“Highbush Blueberry”
Claim · model-written summary
Higher N rates commonly caused excess foliar Mn in 1997.
- Taxon
- Highbush BlueberryVaccinium corymbosumt0
- Treatment
- higher N ratese0
- Outcome
- foliar Mne0
- Value
- 800 to 100 ppme0
- Qualifier
- in 1997e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excess foliar Mn (800 to 100 ppm) was common with the higher N rates in 1997”
t0“Highbush Blueberry”
The same questions in other papers
nitrogen · nutrient: content · Vaccinium corymbosum (highbush blueberry)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.