Abstract
Young `Hamlin' orange trees [ Citrus sinensis (L.) Osbeck] were fertilized six times/year with water-soluble N fertilizer at recommended rates (0.20, 0.34, and 0.38 kg N/tree per year) and with controlled-release fertilizer one time/year [Osmocote, IDBU, and a 44.5% urea-N fertilizer coated with a sulfonated ethylene-propylene-diene polymer (Sherritt, Inc.)] at 0.04, 0.06, and 0.08 kg N/tree per year for years 1, 2, and 3, respectively. There were no differences in trunk diameter, tree height, or tree rating among treatments in any year, although there was a slight reduction in tree rating for some trees with biuret symptoms in the Sherritt treatment in year 2. Leaf nitrogen content was acceptable for all treatments in all 3 years, except for the Osmocote treatment in year 2, which had low to deficient levels. Levels of other nutrients were all within acceptable ranges, except for low potassium levels for the Osmocote in year 2. There were no significant differences in yields of young trees in year 3, the first bearing year. Given its 44.5% N analysis, the total amount of Sherritt controlled-release fertilizer applied to young citrus trees was 4% that of the standard, water-soluble fertilizer and from 39% to 45% that of the two other controlled-release fertilizers in years 1, 2, and 3.
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Claims 9
Claim · model-written summary
Controlled-release fertilizer and water-soluble N fertilizer did not differ in trunk diameter, tree height or tree rating.
- Taxon
- Citrus sinensis
Citrus sinensise1 - Treatment
- controlled-release fertilizere0
- Outcome
- trunk diameter, tree height, or tree ratinge2
- Direction
- no differencese2
- Comparator
- water-soluble N fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e0“fertilized six times/year with water-soluble N fertilizer at recommended rates (0.20, 0.34, and 0.38 kg N/tree per year) and with controlled-release fertilizer one time/year”
e2“There were no differences in trunk diameter, tree height, or tree rating among treatments in any year”
Claim · model-written summary
Tree rating slightly decreased in some trees with biuret symptoms in the Sherritt treatment in year 2.
- Taxon
- Citrus sinensisCitrus sinensise1
- Treatment
- Sherritt treatmente3
- Outcome
- tree ratinge3
- Direction
- slight reductione3
- Qualifier
- biuret symptomse3
- Setting
- in year 2e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e3“There was a slight reduction in tree rating for some trees with biuret symptoms in the Sherritt treatment in year 2”
Claim · model-written summary
Leaf nitrogen content was acceptable for all treatments in all 3 years, except for the Osmocote treatment.
- Taxon
- Citrus sinensisCitrus sinensise1
- Outcome
- Leaf nitrogen contente4
- Direction
- acceptablee4
- Qualifier
- except for the Osmocote treatmente4
- Setting
- in all 3 yearse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e4“Leaf nitrogen content was acceptable for all treatments in all 3 years, except for the Osmocote treatment in year 2, which had low to deficient levels”
Claim · model-written summary
Osmocote-treated young orange trees had low to deficient leaf nitrogen content in year 2.
- Taxon
- Citrus sinensisCitrus sinensise1
- Treatment
- Osmocote treatmente4
- Outcome
- Leaf nitrogen contente4
- Direction
- low to deficiente4
- Setting
- in year 2e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e4“Leaf nitrogen content was acceptable for all treatments in all 3 years, except for the Osmocote treatment in year 2, which had low to deficient levels”
Claim · model-written summary
Levels of other nutrients were within acceptable ranges.
- Taxon
- Citrus sinensisCitrus sinensise1
- Outcome
- Levels of other nutrientse5
- Direction
- within acceptable rangese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e5“Levels of other nutrients were all within acceptable ranges, except for low potassium levels for the Osmocote in year 2”
Claim · model-written summary
Potassium levels were low in Osmocote-treated trees in year 2.
- Taxon
- Citrus sinensisCitrus sinensise1
- Treatment
- Osmocotee5
- Outcome
- potassium levelse5
- Direction
- lowe5
- Setting
- in year 2e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e5“Levels of other nutrients were all within acceptable ranges, except for low potassium levels for the Osmocote in year 2”
Claim · model-written summary
Controlled-release fertilizer and water-soluble N fertilizer did not differ significantly in yields of young trees in year 3.
- Taxon
- Citrus sinensisCitrus sinensise1
- Treatment
- controlled-release fertilizere0
- Outcome
- yields of young treese6
- Direction
- no significant differencese6
- Comparator
- water-soluble N fertilizere0
- Setting
- in year 3e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e0“fertilized six times/year with water-soluble N fertilizer at recommended rates (0.20, 0.34, and 0.38 kg N/tree per year) and with controlled-release fertilizer one time/year”
e6“There were no significant differences in yields of young trees in year 3, the first bearing year”
Claim · model-written summary
The total amount of Sherritt controlled-release fertilizer applied was 4% that of the standard water-soluble fertilizer.
- Taxon
- Citrus sinensisCitrus sinensise1
- Outcome
- total amount of Sherritt controlled-release fertilizer appliede7
- Value
- 4%e7
- Qualifier
- Given its 44.5% N analysise7
- Comparator
- standard, water-soluble fertilizere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e7“Given its 44.5% N analysis, the total amount of Sherritt controlled-release fertilizer applied to young citrus trees was 4% that of the standard, water-soluble fertilizer”
Claim · model-written summary
The total amount of Sherritt controlled-release fertilizer applied was 39% to 45% that of the two other controlled-release fertilizers in years 1 to 3.
- Taxon
- Citrus sinensisCitrus sinensise1
- Outcome
- total amount of Sherritt controlled-release fertilizer appliede2
- Value
- 39% to 45%e3
- Comparator
- the two other controlled-release fertilizerse3
- Setting
- years 1, 2, and 3e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Citrus sinensis (L.) Osbeck”
e2“Given its 44.5% N analysis, the total amount of Sherritt controlled-release fertilizer applied to young citrus trees was 4% that of the standard, water-soluble fertilizer”
e3“from 39% to 45% that of the two other controlled-release fertilizers in years 1, 2, and 3”
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