Penelitian ini bertujuan untuk mengetahui pengaruh pemberian dosis pupuk NPK terhadap pertambahan tanaman cabe jamu (Piper retrofractumVahl) yang telah berumur 1 tahun. Penelitian dilaksanakan di Kebun Percobaan Program Studi Agroteknologi Fakultas Pertanian Universitas Trunojoyo Madura yang terletak pada ketinggian ± 5 mdpl. Penelitian dilaksanakan dari bulan Oktober 2016 hingga Januari 2017. Penelitian menggunakan Rancangan Acak Lengkap (RAL) dengan 5 perlakuan dan 6 ulangan. Masing-masing perlakuannya yaitu dengan dosis pupuk A (tanpa pupuk/kontrol), B (pupuk NPK 60 g), C (pupuk NPK 75 g), D (pupuk NPK 100 g), E (pupuk NPK 150 g). Hasil penelitian menunjukkan bahwa perlakuan dosis pupuk NPK 60 g (B) memberikan pertambahan tertinggi terhadap parameter tinggi tanaman, jumlah daun, jumlah ruas, jumlah akar yang melekat dan jumlah cabang. Kata Kunci : Piper retrofractum Vahl, Dosis Pupuk, dan Pertumbuhan.

This study aimed to examine the effect of NPK fertilizer application on the growth of 1-year-old herbs (Piper retrofractumVahl). The research was carried out in Research Field of Agrotechnology, Faculty of Agriculture, Trunojoyo Madura University from October 2016 to January 2017. The experiment employed Completely Randomized Design (CRD) with 5 treatments, and eack treatment was repeated for 6 replications. The treatment was fertilizer dosage, namely without fertilizer (Control, A), 60 g/plant (B), 75 g/plant (C), 100 g/plant (D), 150 g/plant (E). Results showed that the treatment of the fertilizer application at 60 g/plant (B) gave the highest increase on plant height and leaf, internode, adventitious root, and branch number. Keywords: Piper retrofractumVahl, Fertilizer Dose, and Growth.

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