Abstract
Field and pot experiments were practised during the years 1951 and 1951 in the Aomori Apple Experiment Station to research whether apple leaves absorb urea of foliar fertilization. The principal results obtained in these years summarized as follows.1. Apple trees were possible to absorb the nitrogen through the leaves from spray solution of urea and the concentration of 5 pound of urea per 100 gallons of water resulted in no burning of leaves, while the concentration of 10 pounds per 100 gallons caused some marginal burning of leaves.2. Urea sprays increased the leaf color, average nitrogen content (total nitrogen and protein-nitrogen) of the leaves and terminal-growth of apple trees, but did not show significant effects on good fruit color and fruit size.3. Urea spray recovered the tree vigor of the extremely weakened young Jonathan apple tree which did not form the flower buds for years and consequently about 28 per cent of the treated terminal buds formed blossoms. On the other hand, the flower buds of a plot receiving no urea spray was only 2.9 per cent of the terminal buds.4. Sprays of urea mixed with lime sulphur and Bordeaux mixture during the end of July to mid August were absorbed through the leaves at the same rate of urea alone and did not burn the leaves by mixing with these chemicals.
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Claims 9
Claim · model-written summary
Apple leaves absorbed nitrogen from a urea spray.
- Taxon
- Apple trees
Malus domesticae0 - Treatment
- spray solution of ureae0
- Outcome
- absorb the nitrogen through the leavese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apple trees were possible to absorb the nitrogen through the leaves from spray solution of urea”
Claim · model-written summary
Five pounds of urea per 100 gallons did not burn apple leaves.
- Taxon
- apple treesMalus domesticat0
- Treatment
- 5 pound of urea per 100 gallons of watere0
- Outcome
- no burning of leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of 5 pound of urea per 100 gallons of water resulted in no burning of leaves”
t0“On the foliar fertilization of apple trees with urea”
Claim · model-written summary
Ten pounds of urea per 100 gallons caused marginal leaf burn.
- Taxon
- apple treesMalus domesticat0
- Treatment
- 10 pounds per 100 gallonse0
- Outcome
- marginal burning of leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of 10 pounds per 100 gallons caused some marginal burning of leaves”
t0“On the foliar fertilization of apple trees with urea”
Claim · model-written summary
Urea sprays increased apple leaf color, leaf nitrogen content, and terminal growth.
- Taxon
- apple treesMalus domesticae0
- Treatment
- Urea sprayse0
- Outcome
- leaf color, average nitrogen contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea sprays increased the leaf color, average nitrogen content (total nitrogen and protein-nitrogen) of the leaves and terminal-growth of apple trees”
Claim · model-written summary
Urea sprays had no significant effect on apple fruit color and size.
- Taxon
- apple treesMalus domesticat0
- Treatment
- ureat0
- Outcome
- good fruit color and fruit sizee0
- Direction
- did not show significant effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not show significant effects on good fruit color and fruit size”
t0“On the foliar fertilization of apple trees with urea”
Claim · model-written summary
Urea spray restored vigor of weakened young Jonathan apple trees.
- Taxon
- apple treeMalus domesticae0
- Material
- Jonathane0
- Treatment
- Urea spraye0
- Outcome
- tree vigore0
- Direction
- recoverede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea spray recovered the tree vigor of the extremely weakened young Jonathan apple tree”
Claim · model-written summary
Urea treatment yielded blossoms on about 28% of terminal buds, versus 2.9% without urea.
- Taxon
- apple treesMalus domesticat0
- Treatment
- treatede0
- Outcome
- terminal buds formed blossomse0
- Value
- about 28 per cente0
- Qualifier
- 2.9 per cente0
- Comparator
- no urea spraye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“about 28 per cent of the treated terminal buds formed blossoms. On the other hand, the flower buds of a plot receiving no urea spray was only 2.9 per cent of the terminal buds”
t0“On the foliar fertilization of apple trees with urea”
Claim · model-written summary
Urea sprays mixed with lime sulphur or Bordeaux mixture were absorbed at the same rate as urea alone.
- Taxon
- apple treesMalus domesticat0
- Treatment
- Sprays of urea mixed with lime sulphur and Bordeaux mixturee0
- Outcome
- absorbed through the leavese0
- Direction
- same ratee0
- Comparator
- urea alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sprays of urea mixed with lime sulphur and Bordeaux mixture during the end of July to mid August were absorbed through the leaves at the same rate of urea alone”
t0“On the foliar fertilization of apple trees with urea”
Claim · model-written summary
Mixing urea sprays with lime sulphur and Bordeaux mixture did not burn leaves.
- Taxon
- apple treesMalus domesticat0
- Treatment
- Sprays of urea mixed with lime sulphur and Bordeaux mixturee0
- Outcome
- did not burn the leavese0
- Comparator
- urea alonee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sprays of urea mixed with lime sulphur and Bordeaux mixture during the end of July to mid August were absorbed through the leaves at the same rate of urea alone and did not burn the leaves by mixing with these chemicals”
t0“On the foliar fertilization of apple trees with urea”
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