Abstract
A factorial field experiment is described in which cultural, irrigation, and nitrogen treatments were tested on citrus trees of different stocks and scions. The sod treatment quickly caused decreases in growth of the trees and the yield and quality of the fruit produced. The plots where bare soil was maintained have given large healthy trees with high yields of good-quality fruit, in spite of an observed deterioration of soil structure in these plots. Nitrogen treatments improved the yield and health of the trees in the sod treatments but have had no effect on the other cultural treatments. Root distribution, soil fertility, and leaf analysis studies, undertaken to try to explain the reasons for the yield differences noted, are described and it is concluded that nitrogen effects could explain all differences recorded to date.
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Claims 8
Claim · model-written summary
Sod reduced citrus tree growth.
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sod treatment quickly caused decreases in growth of the trees and the yield and quality of the fruit produced”
t0“citrus trees”
Claim · model-written summary
Sod reduced citrus fruit yield and quality.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sod treatment quickly caused decreases in growth of the trees and the yield and quality of the fruit produced”
t0“citrus trees”
Claim · model-written summary
Bare soil plots produced large healthy citrus trees and high quality fruit yields.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plots where bare soil was maintained have given large healthy trees with high yields of good-quality fruit”
t0“citrus trees”
Claim · model-written summary
Bare soil plots showed deterioration of soil structure.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an observed deterioration of soil structure in these plots”
t0“citrus trees”
Claim · model-written summary
Nitrogen improved yield in sod-treated citrus trees.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen treatments improved the yield and health of the trees in the sod treatments”
t0“citrus trees”
Claim · model-written summary
Nitrogen improved health in sod-treated citrus trees.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen treatments improved the yield and health of the trees in the sod treatments”
t0“citrus trees”
Claim · model-written summary
Nitrogen had no effect in the other cultural treatments.
- Treatment
- Nitrogen treatmentse1
- Outcome
- effecte0
- Direction
- no effecte0
- Comparator
- other cultural treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but have had no effect on the other cultural treatments”
e1“Nitrogen treatments improved the yield and health of the trees in the sod treatments”
t0“citrus trees”
Claim · model-written summary
The authors conclude nitrogen effects may explain all yield differences observed so far.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is concluded that nitrogen effects could explain all differences recorded to date”
t0“citrus trees”
The same questions in other papers
nitrogen · yield · CitrusResults differ
16 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- no effect
- negative
17 papers more in this group
See all 21 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.