Abstract
Fruit growth patterns and nitrogen (N) accumulation in fruit over the growth period were studied on ‘Valencia’, ‘Parson Brown’, ‘Hamlin’, and ‘Sunburst’ cultivars which received either 168, 224, or 280 kgNha−1yr−1 as broadcast applications of N:P:K dry soluble granular fertilizer. Over a 4-year period, fruit yields of all cultivars did not respond to N rates during low production years. The effects of fertilizer rates were non-significant on either fruit diameter, dry weight, or fruit N content. Fruit weight and fruit diameter increased rapidly from June to Aug. or Sept., followed by a slow increase during the remainder of the fruit development period. Fruit size of ‘Sunburst’ was significantly smaller than that of the other three cultivars, which showed no differences in fruit diameter or dry weight. Nitrogen accumulation in the fruit increased rapidly between June and Aug., followed by marginal or no increase during the remainder of the growth period. Thus, most of the N accumulation occurred prior to Aug., for all cultivars. Nitrogen content of mature fruit (fresh weight basis) followed the order: ‘Valencia’ > ‘Parson Brown’=‘Hamlin’ > ‘Sunburst’. Total N content of the fruit at a given fruit yield level followed the order: ‘Sunburst’ = ‘Valencia’ > ‘Parson Brown’ > ‘Hamlin’. This study has clearly demonstrated that adequate availability of N is critical during the initial fruit development and growth stages. Application of N later during the growing period will have minimal impact on the fruit yield. However, it could contribute to N reserve in the tree, which may be utilized for fruit production the following year.
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Claims 13
Claim · model-written summary
Fruit yields of all cultivars did not respond to N rates in low production years.
- Treatment
- N ratese1
- Outcome
- fruit yields of all cultivarse1
- Direction
- did not responde1
- Qualifier
- during low production yearse1
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e1“fruit yields of all cultivars did not respond to N rates during low production years”
Claim · model-written summary
Fertilizer rates had non-significant effects on fruit diameter, dry weight and fruit N content.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e2“The effects of fertilizer rates were non-significant on either fruit diameter, dry weight, or fruit N content”
Claim · model-written summary
Fruit weight and fruit diameter increased rapidly from June to August or September.
- Outcome
- Fruit weight and fruit diametere3
- Direction
- increased rapidlye3
- Qualifier
- from June to Aug. or Sept.e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e3“Fruit weight and fruit diameter increased rapidly from June to Aug. or Sept., followed by a slow increase during the remainder of the fruit development period”
Claim · model-written summary
Fruit weight and fruit diameter showed a slow increase for the remainder of the fruit development period.
- Outcome
- Fruit weight and fruit diametere3
- Direction
- slow increasee3
- Qualifier
- during the remainder of the fruit development periode3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e3“Fruit weight and fruit diameter increased rapidly from June to Aug. or Sept., followed by a slow increase during the remainder of the fruit development period”
Claim · model-written summary
Fruit of Sunburst was significantly smaller than fruit of the other three cultivars.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e5“Fruit size of ‘Sunburst’ was significantly smaller than that of the other three cultivars”
Claim · model-written summary
The other three cultivars showed no differences in fruit diameter or dry weight.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e6“Fruit size of ‘Sunburst’ was significantly smaller than that of the other three cultivars, which showed no differences in fruit diameter or dry weight”
Claim · model-written summary
Fruit nitrogen accumulation increased rapidly between June and August.
- Outcome
- Nitrogen accumulation in the fruite7
- Direction
- increased rapidlye7
- Qualifier
- between June and Aug.e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e7“Nitrogen accumulation in the fruit increased rapidly between June and Aug., followed by marginal or no increase during the remainder of the growth period”
Claim · model-written summary
Fruit nitrogen accumulation showed marginal or no increase for the remainder of the growth period.
- Outcome
- Nitrogen accumulation in the fruite7
- Direction
- marginal or no increasee7
- Qualifier
- during the remainder of the growth periode7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e7“Nitrogen accumulation in the fruit increased rapidly between June and Aug., followed by marginal or no increase during the remainder of the growth period”
Claim · model-written summary
Most fruit nitrogen accumulation occurred before August for all cultivars.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e1“Thus, most of the N accumulation occurred prior to Aug., for all cultivars”
Claim · model-written summary
Nitrogen content of mature fruit followed the order Valencia > Parson Brown = Hamlin > Sunburst.
- Material
- Valenciae1
- Organ / stage
- mature fruite1
- Outcome
- Nitrogen contente1
- Direction
- followed the ordere1
- Qualifier
- fresh weight basise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e1“Nitrogen content of mature fruit (fresh weight basis) followed the order: ‘Valencia’ > ‘Parson Brown’=‘Hamlin’ > ‘Sunburst’”
Claim · model-written summary
Total nitrogen content of fruit at a given yield level followed the order Sunburst = Valencia > Parson Brown > Hamlin.
- Material
- Sunburste1
- Organ / stage
- the fruite1
- Outcome
- Total N content of the fruit at a given fruit yield levele1
- Direction
- followed the ordere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e1“Total N content of the fruit at a given fruit yield level followed the order: ‘Sunburst’ = ‘Valencia’ > ‘Parson Brown’ > ‘Hamlin’”
Claim · model-written summary
Adequate N availability is critical during the initial fruit development and growth stages.
- Treatment
- adequate availability of Ne1
- Outcome
- critical during the initial fruit development and growth stagese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e1“This study has clearly demonstrated that adequate availability of N is critical during the initial fruit development and growth stages”
Claim · model-written summary
Late-season N application has minimal impact on fruit yield.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ACCUMULATION IN CITRUS FRUITS”
e1“Application of N later during the growing period will have minimal impact on the fruit yield”
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See all 26 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.