Respons Pertumbuhan Tanaman Jeruk Keprok Batu 55 Pada Beberapa Interstock Melalui Metode Top Working

(Growth Responses of Mandarin CV Batu 55 On Several Interstocks Used in Top Working Method)
J. Hort. Vol. 23 No. 4, 2013

Sugiyatno, A1), Setyobudi, L2, Maghfoer, MD2, dan Supriyanto, A1
1Balai Penelitian Tanaman Jeruk dan Buah Subtropika, Jl. Raya Tlekung no. 1, Junrejo, Batu 65301
2Program Pascasarjana, Fakultas Pertanian, Universitas Brawijaya, Jl. Veteran, Malang 65145

ABSTRAK

Pengembangan jeruk keprok berwarna kuning dapat dilakukan dengan menanam benih baru atau menerapkan metode top working yaitu metode mengganti suatu varietas tanaman yang ada dengan varietas baru sesuai selera konsumen. Metode top working dapat dilakukan pada batang bawah tanaman atau pada batang atas tanaman yang berfungsi sebagai batang antara atau interstock. Tujuan penelitian ini ialah untuk mengetahui respons pertumbuhan tanaman jeruk keprok Batu 55 pada beberapa interstock melalui metode top working. Penelitian dilaksanakan di Kebun Percobaan Tlekung, Balai Penelitian Tanaman Jeruk dan Buah Subtropika (Balitjestro), Batu, Jawa Timur (950 m dpl.), mulai Bulan April sampai Oktober 2012. Penelitian menggunakan rancangan acak kelompok dengan 10 perlakuan yaitu kombinasi antara interstock (pamelo, jeruk manis, jeruk siam, jeruk purut), dan kontrol (batang bawah Japansche Citroen) pada metode top working cara okulasi dan sambung kulit. Penelitian diulang sembilan kali. Hasil penelitian menunjukkan bahwa perlakuan KB/P/JC-Ok (keprok Batu 55/interstock pamelo/Japansche Citroen-okulasi), KB/M/JC-SK (keprok Batu 55/interstock jeruk manis/Japansche Citroen-sambung kulit), dan KB/M/JC-Ok (keprok Batu 55/interstock jeruk manis/Japansche Citroen-okulasi) menghasilkan persentase sambungan jadi 100%. Perlakuan KB/JC-Ok (keprok Batu 55/Japansche Citroen-okulasi) menghasilkan pecah tunas paling cepat, sedangkan perlakuan KB/S/JC-Ok (keprok Batu 55/interstock jeruk siam/Japansche Citroen-okulasi) menghasilkan pertumbuhan terbaik pada pertambahan tinggi tunas dan jumlah daun. Kombinasi perlakuan interstock-top working mempunyai rasio C/N lebih tinggi jika dibandingkan dengan tanaman jeruk muda (pembanding). Hasil penelitian ini untuk memberikan rekomendasi kepada petani tentang penggunaan interstock melalui metode top working pada tanaman jeruk keprok Batu 55.
Katakunci: Jeruk; Interstock; Top working

ABSTRACT

The development of yellow mandarin may be achieved through planting new seed or applying top working method. Top working is a method for replacing the existing varieties with the new ones that are more preferred by consumers. The method can be done on the scions or stocks which the latter then after top working act as interstocks. The research was intended to evaluate the growth responses of mandarin cv. Batu 55 on some interstocks achieved via top working. The research was done at Tlekung Experimental Station, Indonesian Citrus and Subtropical Fruit Research Institute (ICSFRI), Batu, East Java (950 m asl.), from April to October 2012. This research designed in randomized block design with 10 treatments which were combination between interstock (pummelo, sweet orange, tangerine, lime), and control (Japansche Citroen rootstock) with top working methods (bud grafting and bark grafting). The treatments were done in nine replications. The result indicated that treatments of KB/P/JC-Ok (mandarin Batu 55/pummelo/Japansche Citroen-bud grafting), KB/M/JC-SK (mandarin Batu 55/interstock sweet orange/Japansche Citroen-bark grafting) and KB/M/JC-Ok (mandarin Batu 55/interstock sweet orange/Japansche Citroen-bud grafting) showed 100% successful grafting. Treatment of KB/JC-Ok (mandarin Batu 55/Japansche Citroen-bud grafting) showed faster bud break, while treatment of KB/S/JC-Ok (mandarin Batu 55/interstock tangerine/Japansche Citroen-bud grafting) showed highest shoot height and leaves number. Combination treatment of interstock-top working showed the higher C/N ratio than young orange plant (control). The results of the research can be used to make a recommendation for growers in employment of interstock on top working growth method of mandarin cv. Batu 55.
Keywords: Citrus; Interstock; Top working

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