Respon Pertumbuhan Stek Kopi Robusta (Coffea canephora Pierre ex A. Froehner) menggunakan Filtrat Bahan Alami yang Mengandung Zat Pengatur Tumbuh Tumbuhan (ZPT) Alami

This study aims to determine the growth response of Robusta coffee cuttings (Coffea canephora ex A. Froehner) using natural material filtrate containing Plant Growth Regulators (PGR). The research which has been carried out for 3 months was designed a Non-Factorial Randomized Block Design (RBD) with 9 treatments, including A1 : without Natural PGR (control), A2 2.5%, A3 5%, A4 7.5% , A5 10%, A6 12.5%, A7 15%, A8 17.5%, and A9 20%. Each action repeated times. Parameters observed included shoot length (cm), leaf root (cm) number roots. Analysis Results data used ANOVA at 5% level LSD (Lessest Significant Difference) follow-up test. results showed that various concentrations tested responded several parameters. effect significantly different all parameters length, roots, length. treatment concentration gave best on parameter 15% PGR.