Abstract
Abstract Bearing 15-year-old ‘Oregon Spur’, ‘Redspur’, and ‘Wellspur Delicious’/seedling apple ( Malus domestica Borkh.) trees in a low-P (2 to 4 ppm) soil were treated over 3 years with different forms and rates of N and N + P fertilizers to overcome a severe condition pf low vigor and low yields. Fruit size and leaf N were greater on trees receiving all forms of N fertilizer than on the untreated controls. Levels of leaf P were up to 2 times greater on NH 4 H 2 P0 4 [mono-ammonium phosphate (MAP)] treated trees than on the controls or N-only [(NH 4 ) 2 S0 4 , NH 4 NO 3 , Ca(NO 3 ) 2 or urea] treated trees. In most instances, the higher rates of MAP (applied in 1983 and 1984) resulted in greater shoot extension and leaf weight than the controls and most of the N-only treated trees. Yield (3-year mean) was greater on ‘Oregon Spur’ and ‘Redspur’ cultivars treated with the moderate rate of MAP than in the controls or in most of the N-only treated trees.
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Claims 5
Claim · model-written summary
Nitrogen fertilizer increased fruit size and leaf nitrogen.
- Taxon
- apple
Malus domesticat0 - Treatment
- all forms of N fertilizere0
- Outcome
- Fruit size and leaf Ne0
- Direction
- greatere0
- Comparator
- the untreated controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit size and leaf N were greater on trees receiving all forms of N fertilizer than on the untreated controls”
t0“apple”
Claim · model-written summary
MAP increased leaf phosphorus up to twofold relative to controls and nitrogen-only treatments.
- Taxon
- appleMalus domesticat0
- Treatment
- NH 4 H 2 P0 4 [mono-ammonium phosphate (MAP)]e0
- Outcome
- leaf Pe0
- Direction
- greatere0
- Value
- 2 timese0
- Comparator
- the controls or N-only [(NH 4 ) 2 S0 4 , NH 4 NO 3 , Ca(NO 3 ) 2 or urea] treated treese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of leaf P were up to 2 times greater on NH 4 H 2 P0 4 [mono-ammonium phosphate (MAP)] treated trees than on the controls or N-only [(NH 4 ) 2 S0 4 , NH 4 NO 3 , Ca(NO 3 ) 2 or urea] treated trees”
t0“apple”
Claim · model-written summary
Higher MAP rates increased shoot extension and leaf weight in most instances.
- Taxon
- appleMalus domesticat0
- Treatment
- the higher rates of MAPe0
- Outcome
- shoot extension and leaf weighte0
- Direction
- greatere0
- Qualifier
- In most instancese0
- Comparator
- the controls and most of the N-only treated treese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most instances, the higher rates of MAP (applied in 1983 and 1984) resulted in greater shoot extension and leaf weight than the controls and most of the N-only treated trees”
t0“apple”
Claim · model-written summary
Moderate MAP increased three-year mean yield of Oregon Spur.
- Taxon
- appleMalus domesticat0
- Material
- ‘Oregon Spur’e0
- Treatment
- the moderate rate of MAPe0
- Outcome
- Yield (3-year mean)e0
- Direction
- greatere0
- Comparator
- the controls or in most of the N-only treated treese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield (3-year mean) was greater on ‘Oregon Spur’ and ‘Redspur’ cultivars treated with the moderate rate of MAP than in the controls or in most of the N-only treated trees”
t0“apple”
Claim · model-written summary
Moderate MAP increased three-year mean yield of Redspur.
- Taxon
- appleMalus domesticat0
- Material
- ‘Redspur’e0
- Treatment
- the moderate rate of MAPe0
- Outcome
- Yield (3-year mean)e0
- Direction
- greatere0
- Comparator
- the controls or in most of the N-only treated treese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield (3-year mean) was greater on ‘Oregon Spur’ and ‘Redspur’ cultivars treated with the moderate rate of MAP than in the controls or in most of the N-only treated trees”
t0“apple”
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