Abstract
The southern highbush blueberry is a hybrid of Vaccinium corymbosum L. and one or more southern-adapted Vaccinium species. The southern highbush is advantageous to blueberry growers in the South since its fruit ripen 1 to 4 weeks in advance of traditional rabbiteye ( V. ashei Reade) cultivars. Only limited research has been done on cultural aspects of southern highbush production. The objective of this study was to determine the optimum nitrogen rate for the southern highbush blueberry. A planting of pine straw-mulched `Cape Fear' blueberry was established in 1994 at the Southwest Research and Extension Center, Hope, Ark. Nitrogen rate treatments (0, 67, 134, 202, 269 kg·ha -1 N) were applied annually over a 3-year period (1997-99) with urea as the N source. Soil samples were taken prior to N fertilization to determine if N applied the previous year influenced current soil analysis values. Foliar elemental composition, fruit yield and individual berry weight were also determined for each treatment. Soil analysis indicated that the carryover effect of N applications from previous years was minimal. However, a possible decline in soil pH, Ca, and Mg over time at the higher N rates indicated that these variables should be closely monitored. No consistent relationship was evident between N application rate and soil nitrate. Nitrogen application rate did not have any consistent impact on yield, berry weight or foliar elemental composition. However, based on foliar N, the data indicate that N rates of 67-134 kg·ha -1 N are adequate for southern highbush in mulched culture.
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Claims 9
Claim · model-written summary
Carryover effects of prior nitrogen applications on soil analysis were minimal.
Verbatim
e0“Soil analysis indicated that the carryover effect of N applications from previous years was minimal.”
t0“Southern Highbush Blueberry”
Claim · model-written summary
Soil pH may decline over time at higher nitrogen rates.
Verbatim
e0“a possible decline in soil pH, Ca, and Mg over time at the higher N rates”
t0“Southern Highbush Blueberry”
Claim · model-written summary
Soil Ca may decline over time at higher nitrogen rates.
Verbatim
e0“a possible decline in soil pH, Ca, and Mg over time at the higher N rates”
t0“Southern Highbush Blueberry”
Claim · model-written summary
Soil Mg may decline over time at higher nitrogen rates.
Verbatim
e0“a possible decline in soil pH, Ca, and Mg over time at the higher N rates”
t0“Southern Highbush Blueberry”
Claim · model-written summary
Nitrogen application rate had no consistent relationship with soil nitrate.
Verbatim
e0“No consistent relationship was evident between N application rate and soil nitrate.”
t0“Southern Highbush Blueberry”
Claim · model-written summary
Nitrogen application rate had no consistent impact on blueberry yield or berry weight.
- Taxon
- southern highbush blueberryt0
- Treatment
- Nitrogen application ratee0
- Outcome
- yield, berry weighte0
- Direction
- did not have any consistent impacte0
Not reportedComparator
Verbatim
e0“Nitrogen application rate did not have any consistent impact on yield, berry weight or foliar elemental composition.”
t0“Southern Highbush Blueberry”
Claim · model-written summary
Nitrogen application rate had no consistent impact on foliar elemental composition.
- Taxon
- southern highbush blueberryt0
- Treatment
- Nitrogen application ratee0
- Outcome
- foliar elemental compositione0
- Direction
- did not have any consistent impacte0
Not reportedComparator
Verbatim
e0“Nitrogen application rate did not have any consistent impact on yield, berry weight or foliar elemental composition.”
t0“Southern Highbush Blueberry”
Claim · model-written summary
Foliar nitrogen data indicate 67-134 kg·ha -1 N is adequate for mulched southern highbush.
Verbatim
e0“based on foliar N, the data indicate that N rates of 67-134 kg·ha -1 N are adequate for southern highbush in mulched culture.”
Claim · model-written summary
Soil pH, Ca, and Mg should be monitored at higher nitrogen rates.
Verbatim
e0“a possible decline in soil pH, Ca, and Mg over time at the higher N rates indicated that these variables should be closely monitored.”
t0“Southern Highbush Blueberry”
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nitrogen · yield · Vaccinium corymbosum (highbush blueberry)Positive and negative results
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