The objective of this study was to know the effect of plant growth promoting rhizobacteria on organic matter different dosages. This study was conducted in Educational and Research Garden of Instiper at Kalikuning Village, Depok Residence, Sleman, Yogyakarta Province, Indonesia.  This study was started at June 18th 2020 until January 2nd 2021. Completely Randomized Design (CRD) was used in this two factorials experiment. The first factor was Plant Growth Promoting Rhizobacteria (PGPR) on 4 levels, those were 0 (control), 5 , 10 and 15 ml/l. The second factor was regusol and organic matter composition.  Those were regusol and organic matter composition (1:0), (1:1), and (1:2).  Anova was used to analyze if there were any significantly different and then to be continued with Duncan Multiple Range Test at 5 % level. The results of this study showed there were interaction significantly between PGPR consentration with organic matter composition on crown wet weight and crown dry weight. The most efficient was found on 9 ml/l PGPR and 1:1 composition of regusol and organic matter.        Key words : pgpr, organic matter, oil palm seedling

ABSTRAK   Penelitian dilaksanakan di KP2 Institut Pertanian Stiper yang terletak di Desa Maguwoharjo, Kecamatan Depok, Kabupaten Sleman, DIY. Dengan ketinggian tempat 118 mpl. Penelitian dilakukan pada tanggal 04 Agustus sampai tanggal 01 november 2022. Penelitian dilakukan dengan rancangan faktorial yang disusun dalam Rancangan Acak Lengkap (RAL) dan terdiri dari dua faktor. Faktor pertama adalah media tanam yang terdiri dari 4 aras pada media tanam berupa (M0) tanah regosol (kontrol), (M1) tanah + pupuk kandang sapi(2:1)  (M2) tanah + sekam padi (2:1), (M3) tanah + pupuk kandang sapi + sekam padi (1:1:1). Faktor kedua adalah asal bahan stek yang terdiri dari 3 aras yaitu bagian pucuk ruas (B1), batang tengah ruas (B2), dan batang bawah ruas (B3), dan masing masing panjang nya 15 cm, Sehingga diperoleh 4 x 3 = 12 kombinasi. Masing masing perlakuan diulang 5 kali dan didapat 60 satuan. Percobaan Data hasil penelitian dianalisis dengan analisis of variance  (Anova) pada jenjang 5%. bila ada pengaruh nyata dilakukan uji lanjut DMRT pada jenjang 5%. Media tanam dan bahan stek terjadi interaksi terhadap tinggi tanaman, jumlah tunas, jumlah daun, berat segar akar, berat kering tanaman, Sedangkan di berat segar tanaman, berat kering akar, lebar daun tidak terjadi interaksi antara media tanam dan bahan stek.   Kata Kunci : Bunga Pukul Delapan, Tanah Regosol, Pupuk Kandang Sapi, Sekam Padi.

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Abstract— This study aims to determine the effect of the application of various materials and the concentration of compost tea on the growth of oil palm seedlings in the pre-nursery. This research was conducted in Pasar Lembu Village, Air Joman District, Asahan Regency, North Sumatra Province. The study was conducted from March to May 2021. This study used a factorial experimental method arranged in a Completely Randomized Design (CRD) consisting of two factors, namely the various of compost tea material consisting of 3 levels (kascing, cow compost and goat compost) and the concentration of compost tea consisting of 3 levels, namely chemical fertilizers Urea and NPK (as control), 1:3, 1:5, 1:10. From these two factors, 12 treatment combinations were obtained with each treatment repeated 6 times, so that 72 plant samples were obtained. The research data were analyzed by analysis of variance at the 5% level. Significantly different data will be further tested with DMRT (Duncan's Multiple Range Test) at the 5% test level. Parameters observed in this study were plant height, number of leaves, stem diameter, crown fresh weight, shoot dry weight, root fresh weight, root dry weight and root length. The results showed that there was no significant interaction between the various of material and the concentration of compost tea on the growth of oil palm seedlings in the pre-nursery. The various materials of compost tea gave the same effect on all research parameters, as well as the concentration of compost tea. Giving compost tea concentration of 1:10 is more efficient and has been able to replace chemical fertilisers of oil palm seedlings in the pre nursery.