Abstract
Abstract Acid, sandy soils selected for blueberry production are usually deficient in plant available phosphorus. Fertilizer addition at planting has not been a recommended practice. This research was designed to evaluate potted blueberry (Vaccinium ashei Reade) plant growth response to P applied at establishment and interacted with N applied during the growing season. Four liter containerized 'Tifblue' rabbiteye blueberry plants were transplanted into 4.4 kg of 1:1 v/v loamy sand:peat mixture in an 8‐liter container. Preplant P was incorporated into the mixture at 0, 20, 40, 60, and 80 kg/ha rates. Nitrogen was split‐applied post‐plant four times at 60‐day intervals beginning 30 days after blueberry bushes were transplanted. Total N rates were equivalent to 0, 112, 224, or 336 kg/ha. Plants were harvested 270 days after transplanting. Phosphorus at the 60 and 80 kg/ha rates increased plant growth 40 and 31%, respectively. Plant growth responded linearly to increasing N rate. Leaf and stem weight increases contributed to this linear response while root weight was not affected by fertilizer N. Total plant dry weight was increased by N rates at the 60 and 80 kg/ha P levels. Phosphorus applications increased leaf P levels, but did not increase soil test P. Leaf redness, caused by cool temperatures, was reduced by high N rates. The optimum P rate for fertilization of the soilrpeat mixture in the planting hole under conditions of this experiment was the equivalent of 60 kg/ha.
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Claims 10
Claim · model-written summary
Phosphorus at 60 kg/ha increased blueberry growth by 40%.
Not reportedComparator
Verbatim
e0“Phosphorus at the 60 and 80 kg/ha rates increased plant growth 40 and 31%, respectively”
e1“potted blueberry (Vaccinium ashei Reade)”
e2“The optimum P rate for fertilization of the soilrpeat mixture in the planting hole under conditions of this experiment was the equivalent of 60 kg/ha”
Claim · model-written summary
Phosphorus at 80 kg/ha increased blueberry growth by 31%.
Not reportedComparator
Verbatim
e0“Phosphorus at the 60 and 80 kg/ha rates increased plant growth 40 and 31%, respectively”
e1“potted blueberry (Vaccinium ashei Reade)”
Claim · model-written summary
Blueberry growth rose linearly with increasing nitrogen rate.
Verbatim
e0“Plant growth responded linearly to increasing N rate”
e1“potted blueberry (Vaccinium ashei Reade)”
Claim · model-written summary
Leaf and stem weight increases contributed to the linear nitrogen response.
Verbatim
e0“Leaf and stem weight increases contributed to this linear response”
e1“Plant growth responded linearly to increasing N rate”
e2“potted blueberry (Vaccinium ashei Reade)”
Claim · model-written summary
Root weight was not affected by fertilizer nitrogen.
Not reportedComparator
Verbatim
e0“root weight was not affected by fertilizer N”
e1“potted blueberry (Vaccinium ashei Reade)”
Claim · model-written summary
Nitrogen increased total blueberry dry weight at 60 and 80 kg/ha phosphorus.
- Taxon
- blueberrye1
- Treatment
- N ratese0
- Outcome
- Total plant dry weighte0
- Direction
- increasede0
- Qualifier
- 60 and 80 kg/ha P levelse0
Not reportedComparator
Verbatim
e0“Total plant dry weight was increased by N rates at the 60 and 80 kg/ha P levels”
e1“potted blueberry (Vaccinium ashei Reade)”
Claim · model-written summary
Phosphorus applications increased blueberry leaf phosphorus levels.
Not reportedComparator
Verbatim
e0“Phosphorus applications increased leaf P levels”
e1“potted blueberry (Vaccinium ashei Reade)”
Claim · model-written summary
Phosphorus applications did not increase soil test phosphorus.
Not reportedComparator
Verbatim
e0“Phosphorus applications increased leaf P levels, but did not increase soil test P”
e1“potted blueberry (Vaccinium ashei Reade)”
Claim · model-written summary
High nitrogen rates reduced cold-associated blueberry leaf redness.
- Taxon
- blueberrye1
- Treatment
- high N ratese0
- Outcome
- Leaf rednesse0
- Direction
- reducede0
- Qualifier
- cool temperaturese0
Not reportedComparator
Verbatim
e0“Leaf redness, caused by cool temperatures, was reduced by high N rates”
e1“potted blueberry (Vaccinium ashei Reade)”
Claim · model-written summary
The authors identified 60 kg/ha as the optimum phosphorus rate for the planting-hole mixture under their conditions.
Verbatim
e0“The optimum P rate for fertilization of the soilrpeat mixture in the planting hole under conditions of this experiment was the equivalent of 60 kg/ha”
e1“potted blueberry (Vaccinium ashei Reade)”
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See all 20 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.