| Summary: | A study of the effect of plant growth regulators on rambutan (Nephelium lappaceum L.) seed viability after .storage was conducted for 5 months. The purpose of this experiment was to study the effect of abscisic acid, gibberellic acid, and length of storage on rambutan seed germination and seedling growth, and to observe the biochemical and physiological changes during storage.
The experiment used 3 x 4 x 6 .factorial design with four replications and arranged in a Completely Randomized Design. The first factor consisted of three levels of abscisic acid concentrations. i.e. 0, 50, and 100 ppm. The second factor was levels of gibberellic acid. i.e. 0, 100, 200, and 300 ppm. The third factor was storage duration with six levels, i.e.: I, 2, 3, 4, .5, and 6 weeks. Observation was done weekly throughout 6 weeks of storage.
The results showed that moisture content of the seeds were still high at the end of the storage, but the Linlulin1 of infected seeds due to fimgal attack and seed germination at storage were high too. It was showed that abscisic acid of 50 ppm inhibited seed germination during storage and the viability of rambutan seeds were still high up to three weeks of storage. Concentration of gibberellic acid of 300 ppm increased rambutan seedling significantly growth .
Keywords.: abscisic acid. gibberellic acid, storage duration, rambutan.
Kajian mengenai zat pengatur turnbuli ditakukan untuk mengetahui pengaruhnya terhadap viabilitas biji rambutan (Nepheliwn lappaceum L.) setelah disimpan selama 5 bulan. Penelitian ini bertujuan untuk mengetahui pengaruh asam absisat, asam giberelat, dan lama penyimpanan benih terhadap perkecambahan biji dan pertumbuhan bibit rambutan, sekaligus mengetahui perubahan biokirnlawi dan risiologis selama disimpan.
Percobaan menggunakan rancangan raktorial 3 x 4 x 6 dengan empat ulangan yang disusun dalarn Rancangan Acak Lengkap. Faktor perlakuan pertama adalah kadar asam absisat yang terdiri 3 aras, yaitu 0. 50, dan 100 ppm. Faktor perlakuan kedua adalah kadar asam giberelat yang terdiri 4 aras, yaitu 0, 100, 200, dan 300 ppm. Faktor ketiga adalah lama penyimpanan yang terdiri 6 aras, yaitu 1, 2, 3, 4, 5, dan 6 minggu. Peng,amatan dilakukan setiap minggu selama 6 minggu penyimpanan,
Hasil penelitian menunjukkan bahwa kadar air biji rambutan tetap tinggi sarnpai akhir penyimpanan, akan terapi jumlah biji yang terinfeksi jamur maupun biji yang berkecambah selama disimpan juga tetap
Kadar asam absisat 50 ppm ternyata menghambat perkecambahan biji rambutan selama disimpan, dan viabilitas biji rambutan masih tinggi sampai 3 minggu penyimpanan. Kadar asam giberelat 300 ppm meningkatkan secara nyata pertumbuhan bibit rambutan.
Kata kunci: asam absisat, asam giberelat, lama penyimpanan, rambutan
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