Evaluasi Pemberian Zat Pengatur Tumbuh terhadap Pertumbuhan Stek Pucuk Corymbia sp IND 125 di Nursery PT. Toba Pulp Lestari

Abstract

Corymbia adalah tanaman kayu yang mudah beradaptasi dan memiliki pertumbuhan yang cepat (fast growing) banyak digunakan dalam pembuatan pulp dan paper. Upaya peningkatan produksi bibit corymbia dapat dilakukan dengan perbanyakan tanaman melalui stek pucuk. Tujuan penelitian ini adalah menganalisis respon pertumbuhan stek pucuk tanaman IND 125 dengan pemberian 2 (dua) jenis zat pengatur tumbuh (IBA dan MSG), dan mendapatkan informasi mengenai dosis zat pengatur tumbuh yang optimal untuk pertumbuhan stek pucuk IND 125. Bahan stek diperoleh dari kebun pangkas departemen Nursery PT. Toba Pulp Lestari. Stek pucuk IND 125 diberi perlakuan tanpa zat pengatur tumbuh, IBA (500 ppm, 1000 ppm, 2000 ppm, dan 5000 ppm) serta MSG (20 g/L dan 100 g/L). Parameter keberhasilan stek pucuk IND 125 diamati dari persen hidup, persen berakar, jumlah akar, panjang akar, jumlah daun serta tinggi tanaman. Pemberian zat pengatur tumbuh berpengaruh nyata terhadap parameter persen hidup, persen berakar dan tinggi tanaman. Perlakuan MSG 20 g/L memberikan hasil terbaik pada perakaran hingga 94,67 % dan mampu meningkatkan persen hidup, persen berakar dan tinggi tanaman.

Corymbia is a fast-growing and adaptable wood plant widely used in the production of pulp and paper. The way to increase production of Corymbia seedlings can be made by propogation plants through shoot cuttings. The aim of this study were analyze the growth response of IND 125 cuttings by application of 2 (two) types of growth regulators (IBA and MSG) and to obtain information about the optimal dosage of growth regulators for the IND 125 shoot cuttings. The cuttings material was obtained from the pruining garden of the Nursery department of PT. Toba Pulp Lestari. IND 125 shoot cuttings were given treatment such as without growth regulators, IBA (500 ppm, 1000 ppm, 2000 ppm, and 5000 ppm) and MSG (20 g/L and 100 g/L). Parameters for the success of IND 125 shoot cuttings were observed from survival rate, percentage of rooted, number of roots, root length, number of leaves and plant height. The aplication of growth regulators significantly affected the survival rate, rooting percentage and plant heigh. The MSG 20 g/L treatment provided the best results in rooting up to 94,67 % and was able to increase survival rate, rooting percentage and plant height.