LIBRO-CONGRESO-CITRUS

S18P21
Crop production of ‘Okitsu’ satsuma mandarin on nine rootstocks in Southern Brazil
Tazima Z.H. 1 , Neves C.S.V.J. 2 , Yada I.F.U. 3 and Leite Junior R.P. 4
1 Instituto Agronômico do Paraná (IAPAR), Ecofisiologia, Brazil; 2 Universidade Estadual de Londrina (UEL), Agronomia, Brazil; 3 Instituto
Agronômico do Paraná (IAPAR), Biometria, Brazil; and 4 Instituto Agronômico do Paraná (IAPAR), Proteção de Plantas, Brazil.
zuleide@iapar.br
This study reports the performance of ‘Okitsu’ satsuma mandarin (Citrus unshiu) trees grafted on nine
different rootstocks and evaluated for nine harvests, in Southern Brazil. The field plot was established in the
Experimental Station of Instituto Agronômico do Paraná (IAPAR), located in the municipality of Londrina,
State of Paraná, Brazil, and planted in July 2000. The experimental design was randomized blocks with nine
treatments, six replications, and two trees per plot. Trees on ‘Swingle’ citrumelo had the highest yield in all
the nine years of evaluation. In contrast, trees on ‘Volkamer’ lemon had the lowest yield in seven of nine
years of harvest. ‘Swingle’ rootstock induced both, the highest cumulative yield (1.568.7 kg/tree) and the
highest average yield per tree. According to the relative yield, ‘Swingle’ citrumelo induced a production index
of 58% higher than trees on ‘Rangpur’ lime, the most important citrus rootstock in Brazil. Furthermore, trees
on ‘Rangpur’ lime had a performance similar to the ones on Trifoliate orange, in regard to crop production.
In relation to yield efficiency, the trees on ‘Swingle’ were similar to the ones on Trifoliate orange, ‘C-13’, and
‘Rangpur’ lime. No alternate bearing was observed for the ‘Okitsu’ satsuma mandarin trees in any of the nine
different rootstocks studied. The highest yield efficiency was presented by trees on Trifoliate orange. Financial
support: Instituto Agronômico do Paraná and Fundação Araucária
S18P22
Effect of rootstock on yield of ‘Okitsu’ satsuma mandarin on sandy soils in Southern Brazil
Tazima Z.H. 1 , Neves, C.S.V.J. 2 , Yada I.F.U. 3 , Stenzel N.M.C. 4 and Leite Junior R.P. 5
1 Instituto Agronômico do Paraná (IAPAR), Ecofisiologia, Brazil; 2 Universidade Estadual de Londrina (UEL), Agronomia, Brazil;
3 Instituto Agronômico do Paraná (IAPAR), Biometria, Brazil; 4 Instituto Agronômico do Paraná (IAPAR), Fitotecnia, Brazil; and 5 Instituto
Agronômico do Paraná (IAPAR), Proteção de plantas, Brazil. nstenzel@iapar.br
Trees of ‘Okitsu’ satsuma mandarin grafted on nine different rootstocks were evaluated for eight harvests,
in Southern Brazil. The field plot was established on Oxisol (Typic Haplorthox) at the Experimental Station of
the Instituto Agronômico do Paraná (IAPAR), located in the Paranavaí municipality, State of Paraná, Brazil,
in January 2001. The experimental design was randomized blocks with nine treatments, three replications,
and two trees per plot. In regard to annual crop production, no statistical differences between treatments
were observed in five of the eight years of harvest. The highest cumulative fruit yield and average yield per
trees of ‘Okitsu’ satsuma mandarin were determined for the trees on ‘Volkamer’ lemon, ‘Rangpur’ lime,
‘Caipira DAC’ sweet orange, ‘Cleopatra’ mandarin and ‘Carrizo’ citrange, while trees on ‘Sunki’ mandarin, ‘C
13’ citrange, ‘Swingle’ citrumelo and trifoliate orange showed the lowest yield. Trees on ‘Volkamer’ lemon
presented similar relative yield to the ones on ‘Rangpur’ lime, the main rootstock used in Brazil. Financial
support: Instituto Agronômico do Paraná and Fundação Araucária.
S18P23
Scion rooting and its discriminance in ‘Shiranuhi’ mandarin hybrid in plastic film house in Korea
Moon Y.E. 1 , Kang S.B. 2 , Kim Y.H. 2 and Han S.G. 2
1 Agricultural Research Center for Climate Change, NIHHS, RDA, Republic of Korea; and 2 Citrus Research Station, NIHHS, RDA, Republic
of Korea. yimoon@korea.kr
Citrus is usually propagated by grafting onto rootstock. In Korea, as trifoliate orange (Poncirus trifoliata)
has dwarf and strong cold hardness, it is widely used as the rootstock of satsuma mandarin. ‘Shiranuhi’
[(Citrus unshiu × Citrus sinensis) × Citrus reticulata)], a kind of citrus, also, generally grafted onto trifoliate
orange, and most of farmers have recognized that ‘Shiranuhi’ root is trifoliate orange naturally. Meanwhile,
reduction of flowering in ‘Shiranuhi’ orchards has been issued among farmers and researchers over the
past few years, and they guessed that it was occurred by severe prunning, oversupply of fertilization,
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