Abstract
SummaryThe effects of pH (4.5 or 6.5), growing medium (peat or soil) and of two rates of iron as iron sulphate or iron chelate (Fe-EDTA) on the growth and leaf nutrient content of young highbush blueberries were investigated in a greenhouse study. Plant dry matter production was greater at pH 4.5 than at 6.5 in both media, although the difference was more marked in the peat. From the leaf nutrient contents it appears that at pH 4.5 growth in soil was likely to have been limited by Mn and Al toxicities whereas at pH 6.5 growth in peat was possibly limited by deficiencies of Fe and Mn. Dry matter production was unaffected by Fe treatments at pH 4.5, but at pH 6.5 the high rate of chelate addition reduced plant growth in both media. The reduced growth was associated with lowered levels of leaf Mn but levels of other nutrients were unaffected. Extractable micronutrients showed different trends with pH, depending upon the medium, the extractant used and the element being assayed. In general, EDTA did not appea...
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Claims 6
Claim · model-written summary
Blueberry dry matter production was greater at pH 4.5 than pH 6.5 in both media, especially peat.
- Taxon
- highbush blueberry
Vaccinium corymbosumt0 - Treatment
- pH 4.5e0
- Outcome
- Plant dry matter productione0
- Direction
- greatere0
- Qualifier
- difference was more marked in the peate0
- Comparator
- 6.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant dry matter production was greater at pH 4.5 than at 6.5 in both media, although the difference was more marked in the peat”
t0“highbush blueberry plants”
Claim · model-written summary
At pH 4.5 in soil, manganese and aluminum toxicity likely limited blueberry growth.
- Taxon
- highbush blueberryVaccinium corymbosumt0
- Compound
- Mn and Ale0
- Outcome
- growthe0
- Qualifier
- likely to have been limitede0
- Setting
- soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at pH 4.5 growth in soil was likely to have been limited by Mn and Al toxicities”
t0“highbush blueberry plants”
Claim · model-written summary
At pH 6.5 in peat, iron and manganese deficiencies possibly limited blueberry growth.
- Taxon
- highbush blueberryVaccinium corymbosumt0
- Compound
- Fe and Mne0
- Outcome
- growthe0
- Qualifier
- possibly limitede0
- Setting
- peate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at pH 6.5 growth in peat was possibly limited by deficiencies of Fe and Mn”
t0“highbush blueberry plants”
Claim · model-written summary
Iron treatments did not affect dry matter production at pH 4.5.
- Taxon
- highbush blueberryVaccinium corymbosumt0
- Treatment
- Fe treatmentse0
- Outcome
- Dry matter productione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter production was unaffected by Fe treatments at pH 4.5”
t0“highbush blueberry plants”
Claim · model-written summary
At pH 6.5, a high chelate rate reduced blueberry growth in both media.
- Taxon
- highbush blueberryVaccinium corymbosumt0
- Treatment
- high rate of chelate additione0
- Outcome
- plant growthe0
- Direction
- reducede0
- Qualifier
- at pH 6.5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at pH 6.5 the high rate of chelate addition reduced plant growth in both media”
t0“highbush blueberry plants”
Claim · model-written summary
Reduced growth was associated with lower leaf manganese, while other leaf nutrients were unaffected.
- Taxon
- highbush blueberryVaccinium corymbosumt0
- Compound
- leaf Mne0
- Outcome
- reduced growthe0
- Direction
- lowerede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduced growth was associated with lowered levels of leaf Mn but levels of other nutrients were unaffected”
t0“highbush blueberry plants”
The same questions in other papers
ph · yield · Vaccinium corymbosum (highbush blueberry)Results agree
1 paper in the same direction as this paper
- 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.