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Abstrak :
Oil palm is a plant that has a long seed dormancy period. The existence of barrier on the seed coat causes disturbance on imbibition so the process of germination of oil palm seed is hampered. This study aimed to determine the effect of interaction between the heat treatment by dry-heat treatment method and the submersion of growth regulator gibberellin on oil palm dormancy breaking. The experiment was conducted using a factorial randomized block design with 2 factors, i.e. 3 levels of dry-heat treatment duration (40 days, 50 days, 60 days) and 3 levels of gibberellin concentration (0 ppm, 100 ppm, 200 ppm) and repeated 3 times. The result showed that no interaction between the duration of dry heat treatment and concentration of gibberellin on breaking the oil palm dormancy. Treatment of dry heat treatment of 50 and 60 days had a good effect on percentage of germination, vigor index, radicle length and plumule length. Concentration of 100 and 200 ppm gibberellin had a good effect on percentage of germination, vigor index, radicle length and plumule length. Fifty days-period of dry heat treatment and concentration of 100 ppm gibberellin gave more effective effect than other treatment.

Kelapa sawit merupakan tanaman yang memiliki masa dormansi benih yang panjang. Adanya penghalang kulit benih menyebabkan proses imbibisi menjadi terganggu sehingga proses perkecambahan benih kelapa sawit terhambat. Penelitian ini bertujuan untuk mengetahui pengaruh interaksi antara perlakuan pemanasan dengan metode dry heat treatment dan pemberian zat pengatur tumbuh giberelin terhadap pemecahan dormansi kelapa sawit. Percobaan dilakukan menggunakan rancangan acak kelompok faktorial dengan 2 faktor, yaitu 3 taraf lama dry heat treatment (40 hari, 50 hari, 60 hari) dan 3 taraf konsentrasi giberelin (0 ppm, 100 ppm, 200 ppm) yang diulang sebanyak 3 kali. Hasil penelitian menunjukkan tidak terdapat pengaruh interaksi antara lama dry heat treatment dan konsentrasi giberelin terhadap pemecahan dormansi kelapa sawit. Perlakuan lama dry heat treatment 50 dan 60 hari berpengaruh baik pada variabel persentase perkecambahan dan indeks vigor serta panjang radikula dan panjang plumula. Konsentrasi giberelin 100 dan 200 ppm berpengaruh baik pada variabel persentase perkecambahan, indeks vigor, panjang radikula dan panjang plumula. Lama dry-heat treatment 50 hari dan konsentrasi giberelin 100 ppm memberikan pengaruh paling efektif daripada kombinasi perlakuan lain.

Abstrak :
Polianthes tuberosa L. is a potential flowering plant to be developed in Jatinangor, but, the type of soil in Jatinangor belongs to Fluventic Eutrudepts has a lower of pH, medium of available K and potential K. New strategy is needed to resolve these problems such as by adding the organic and an-organic fertilizer. This research was conducted to determine the effect of the combination organic fertilizer and NPK on soil reaction (pH), available K, Potential K, and fresh weight of tuberose (Polyanthes tuberose L.) on Fluventic Eutrudepts. The research design used was Randomized Block Design (RBD) with ten treatments and three replications, consist of: without organic fertilizer + NPK (control); without organic fertilizer + recommended dosage of NPK; recommended dosage of organic fertilizer + without NPK; ½ recommended dosage of organic fertilizer + ½ recommended dosage of NPK; ½ recommended dosage of organic fetilizer + recommended dosage of NPK; recommended dosage of organic fetilizer + ½ recommended dosage of NPK; without organic fertilizer + 1 ½ recommended dosage of NPK; 1 ½ recommended dosage of organic fertilizer + without NPK; 1 ½ recommended dosage of organic fertilizer + ½ recommended dosage of NPK; 1 ½ recommended dosage of organic fertilizer + recommended dosage of NPK. The results show that there were effect of soil reaction (pH), available P, potential P, and fresh weight of tuberose from combination of organic fetilizer and NPK. Treatments of 1 ½ recommended dosage of organic fertilizer + without NPK gives the best results of 148,6 g plant-1 with an increase 63,2% compared with no treatment.

Sedap malam (Polianthes tuberosa L.) merupakan tanaman hias berbunga indah yang sangat potensial dikembangkam salah satunya di Jatinagor. Tanah di Jatinangor yang termasuk ke dalam sub group Fluventic Eutrudepts mempunyai reaksi tanah agak masam, K-potensial sedang, K-dd sedang, dan KTK rendah, sehingga perlu dilakukan upaya untuk meningkatkannya yang salah satunya dengan pemupukan. Percobaan dilakukan untuk mengetahui pengaruh pemberian kombinasi pupuk organik dan pupuk NPK terhadap K-potensial, K-dd, KTK dan bobot segar tanaman sedap malam (Polyanthes tuberosa L.) pada Fluventic Eutrudepts. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok (RAK) faktor tunggal dengan sepuluh perlakuan dan tiga ulangan, yaitu terdiri dari : Tanpa pupuk organik + pupuk NPK (kontrol); Tanpa pupuk organik + dosis anjuran NPK; Dosis anjuran pupuk organik + tanpa pupuk NPK; ½ dosis anjuran pupuk organik + ½ dosis anjuran NPK; ½ dosis anjuran pupuk organik + dosis anjuran NPK; Dosis anjuran pupuk organik + ½ dosis anjuran NPK; Tanpa pupuk organik + 1 ½ dosis anjuran NPK; 1 ½ dosis anjuran pupuk organik + tanpa pupuk NPK; 1 ½ dosis anjuran pupuk organik + ½ dosis anjuran NPK; 1 ½ dosis anjuran pupuk organik + dosis anjuran NPK. Hasil penelitian menunjukan terdapat pengaruh terhadap K-potensial, K-dd, KTK dan bobot segar tanaman sedap malam akibat pemberian kombinasi pupuk organik dan pupuk NPK. Perlakuan 1 ½ dosis anjuran pupuk organik + tanpa pupuk NPK memberikan bobot segar tanaman sedap malam terbaik sebesar 148,6 g tanaman-1 dengan kenaikan bobot segar 63,2% dibandingkan dengan tanpa perlakuan.