Rootstocks and the Performance and Economic Returns of 'Hamlin' Sweet Orange 'Trees
Identifieur interne : 001C56 ( Main/Exploration ); précédent : 001C55; suivant : 001C57Rootstocks and the Performance and Economic Returns of 'Hamlin' Sweet Orange 'Trees
Auteurs : William S. Castle [États-Unis] ; James C. Baldwin [États-Unis] ; Ronald P. Muraro [États-Unis]Source :
- HortScience [ 0018-5345 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Rentabilité, Horticulture.
English descriptors
- KwdEn :
Abstract
'Hamlin' is a principal sweet orange grown in Florida for processing. It is productive but produces juice with low soluble solids content and poor color. A long-term trial was conducted in central Florida to determine rootstock effects on yield and juice quality and the effect of economic analysis on the interpretation of the horticultural results. The trees were a commonly used commercial selection of 'Hamlin' sweet orange [Citrus sinensis (L.) Osb.] propagated on 19 rootstocks planted in a randomized complete block design of three-tree plots with six replicates in a Spodosol soil at a density of 350 trees/ha. Routine horticultural data were collected from the original trial (H1) for 10 years. Trees on some rootstocks that grew and yielded poorly were removed within a few years and replaced with a second trial (H2) with 13 rootstocks from which data were collected for 5 years. The H1 data were financially analyzed to compare the relative usefulness of horticultural and economic data in interpreting results and making rootstock decisions. In H1 after 10 years, tree height ranged from greater than 5 m [Volkamer lemon (C. volkameriana Ten. & Pasq.)] and Cleopatra mandarin (C. reshni Hort. ex Tan.) to 2.4 m {Flying Dragon trifoliate orange [Poncirus trifoliata (L.) Raf.]}. In H2, the trees on somatic hybrid rootstocks were ≃2 m tall after 8 years and 4.4 m among those on mandarins and C-32 citrange (C. sinensis x P. trifoliata). Tree losses from citrus blight were generally low except for the trees on Carrizo and Troyer citranges (greater than 50%). Horticulturally, the highest performing trees in H1, measured by cumulative yield and soluble solids production over 10 years, were those on Carrizo, Troyer, and Benton citranges; poor performers were those on Smooth Flat Seville and Kinkoji (putative sour orange hybrids). Fruit yield and soluble solids production were directly related to tree height regardless of the difference among rootstocks in juice quality. The same relationship existed among the trees in H2 in which the best rootstocks were C-32 and Morton citranges. Trees on Swingle citrumelo (C. paradisi Macf. x P. trifoliata) ranked no. 12 of 19 rootstocks and 9 of 13 rootstocks in H1 and H2, respectively. Financial interpretation of the outcomes to include tree replacement resulting from blight losses did not substantially change the horticultural interpretations. Additional financial analyses demonstrated that the performance of trees on rootstocks with relatively low productivity/tree, like those on C-35 citrange and Kinkoji, would equal those on more vigorous rootstocks when tree vigor was properly matched with spacing. Yield determined the economic outcomes and financial analysis aided the interpretation of rootstock horticultural effects but did not greatly alter the relationship among rootstock results. Highly significant correlations between annual and cumulative data indicated that relative rootstock performance among 'Hamlin' orange trees in Florida could be reliably determined based on the first 4 cropping years.
Affiliations:
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Le document en format XML
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Rootstocks and the Performance and Economic Returns of 'Hamlin' Sweet Orange 'Trees</title>
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<term>Citrus sinensis</term>
<term>Citrus volkameriana</term>
<term>Discount</term>
<term>Economic return</term>
<term>Horticulture</term>
<term>Internal</term>
<term>Performance</term>
<term>Poncirus trifoliata</term>
<term>Profitability</term>
<term>Rootstock</term>
<term>Somatic hybrid</term>
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<term>Performance</term>
<term>Rentabilité</term>
<term>Rabais</term>
<term>Interne</term>
<term>Hybride somatique</term>
<term>Horticulture</term>
<term>Citrus sinensis</term>
<term>Citroncirus webberi</term>
<term>Poncirus trifoliata</term>
<term>Citrus volkameriana</term>
<term>Citrange</term>
<term>Poncirus trifoliata Citrus paradisi</term>
<term>Rendement économique</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Rentabilité</term>
<term>Horticulture</term>
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<front><div type="abstract" xml:lang="en">'Hamlin' is a principal sweet orange grown in Florida for processing. It is productive but produces juice with low soluble solids content and poor color. A long-term trial was conducted in central Florida to determine rootstock effects on yield and juice quality and the effect of economic analysis on the interpretation of the horticultural results. The trees were a commonly used commercial selection of 'Hamlin' sweet orange [Citrus sinensis (L.) Osb.] propagated on 19 rootstocks planted in a randomized complete block design of three-tree plots with six replicates in a Spodosol soil at a density of 350 trees/ha. Routine horticultural data were collected from the original trial (H1) for 10 years. Trees on some rootstocks that grew and yielded poorly were removed within a few years and replaced with a second trial (H2) with 13 rootstocks from which data were collected for 5 years. The H1 data were financially analyzed to compare the relative usefulness of horticultural and economic data in interpreting results and making rootstock decisions. In H1 after 10 years, tree height ranged from greater than 5 m [Volkamer lemon (C. volkameriana Ten. & Pasq.)] and Cleopatra mandarin (C. reshni Hort. ex Tan.) to 2.4 m {Flying Dragon trifoliate orange [Poncirus trifoliata (L.) Raf.]}. In H2, the trees on somatic hybrid rootstocks were ≃2 m tall after 8 years and 4.4 m among those on mandarins and C-32 citrange (C. sinensis x P. trifoliata). Tree losses from citrus blight were generally low except for the trees on Carrizo and Troyer citranges (greater than 50%). Horticulturally, the highest performing trees in H1, measured by cumulative yield and soluble solids production over 10 years, were those on Carrizo, Troyer, and Benton citranges; poor performers were those on Smooth Flat Seville and Kinkoji (putative sour orange hybrids). Fruit yield and soluble solids production were directly related to tree height regardless of the difference among rootstocks in juice quality. The same relationship existed among the trees in H2 in which the best rootstocks were C-32 and Morton citranges. Trees on Swingle citrumelo (C. paradisi Macf. x P. trifoliata) ranked no. 12 of 19 rootstocks and 9 of 13 rootstocks in H1 and H2, respectively. Financial interpretation of the outcomes to include tree replacement resulting from blight losses did not substantially change the horticultural interpretations. Additional financial analyses demonstrated that the performance of trees on rootstocks with relatively low productivity/tree, like those on C-35 citrange and Kinkoji, would equal those on more vigorous rootstocks when tree vigor was properly matched with spacing. Yield determined the economic outcomes and financial analysis aided the interpretation of rootstock horticultural effects but did not greatly alter the relationship among rootstock results. Highly significant correlations between annual and cumulative data indicated that relative rootstock performance among 'Hamlin' orange trees in Florida could be reliably determined based on the first 4 cropping years.</div>
</front>
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<name sortKey="Baldwin, James C" sort="Baldwin, James C" uniqKey="Baldwin J" first="James C." last="Baldwin">James C. Baldwin</name>
<name sortKey="Muraro, Ronald P" sort="Muraro, Ronald P" uniqKey="Muraro R" first="Ronald P." last="Muraro">Ronald P. Muraro</name>
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