Abstract
Abstract The effect of various fertilizers and rates on soil pH, tree growth and mineral uptake has been a concern for fruit tree production. In this study, two acid soils, one nearly neutral soil, and two alkaline soils were used to determine the effect of nitrogen (N) and phosphorus (P) fertilizers on soil pH and tree response in the greenhouse. All of the above soils, except one, contained low levels of available soil phosphorus (5 to 13 ppm) as determined by the sodium bicarbonate test. The moderate and high rates of fertih'zers induced lower soil pH in all soils tested. In one soil of moderate acidity, ammonium sulfate reduced soil pH more than the other N and P fertilizers tested whereas calcium nitrate reduced soil pH only slightly. In most cases, mono‐ammonium phosphate (MAP) fertilizer reduced soil pH slightly more than the other N and P fertilizers tested. Uptake of N and P in apple leaves was higher with increased rates of N and P fertilizers (MAP), but tree growth was not always significantly improved. This indicates a possible reduction of growth with lower pH or high salt concentrations in the soil.
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Claims 6
Claim · model-written summary
Moderate and high fertilizer rates lowered soil pH in all tested soils.
- Taxon
- apple trees
Malus domesticat0 - Treatment
- moderate and high rates of fertih'zerse0
- Outcome
- soil pHe0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple trees”
e0“The moderate and high rates of fertih'zers induced lower soil pH in all soils tested.”
Claim · model-written summary
Ammonium sulfate reduced soil pH more than other nitrogen and phosphorus fertilizers in a moderately acid soil.
- Taxon
- apple treesMalus domesticat0
- Treatment
- ammonium sulfatee0
- Outcome
- soil pHe0
- Direction
- reducede0
- Qualifier
- one soil of moderate aciditye0
- Comparator
- the other N and P fertilizers testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple trees”
e0“In one soil of moderate acidity, ammonium sulfate reduced soil pH more than the other N and P fertilizers tested”
Claim · model-written summary
Calcium nitrate reduced soil pH only slightly.
- Taxon
- apple treesMalus domesticat0
- Treatment
- calcium nitratee0
- Outcome
- soil pHe0
- Direction
- reducede0
- Qualifier
- only slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple trees”
e0“calcium nitrate reduced soil pH only slightly”
Claim · model-written summary
Mono‐ammonium phosphate reduced soil pH slightly more than other nitrogen and phosphorus fertilizers in most cases.
- Taxon
- apple treesMalus domesticat0
- Treatment
- mono‐ammonium phosphate (MAP) fertilizere0
- Outcome
- soil pHe0
- Direction
- reducede0
- Qualifier
- In most casese0
- Comparator
- the other N and P fertilizers testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple trees”
e0“In most cases, mono‐ammonium phosphate (MAP) fertilizer reduced soil pH slightly more than the other N and P fertilizers tested.”
Claim · model-written summary
Higher MAP fertilizer rates increased nitrogen and phosphorus uptake in apple leaves.
- Taxon
- appleMalus domesticae0
- Organ / stage
- leavese0
- Treatment
- increased rates of N and P fertilizers (MAP)e0
- Outcome
- Uptake of N and P in apple leavese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uptake of N and P in apple leaves was higher with increased rates of N and P fertilizers (MAP)”
Claim · model-written summary
Tree growth was not always significantly improved with increased MAP fertilizer rates.
- Taxon
- appleMalus domesticae0
- Treatment
- increased rates of N and P fertilizers (MAP)e0
- Outcome
- tree growthe0
- Direction
- not always significantly improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uptake of N and P in apple leaves was higher with increased rates of N and P fertilizers (MAP), but tree growth was not always significantly improved.”
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See all 117 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.