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.
