Pengaruh Komposisi Media Tanam dan Plant Growth Promoting Rhizobacteria terhadap Pertumbuhan Benih Pepaya di Pembibitan dan di Lapangan

Abstract

Papaya (Carica papaya L.) is one of tropical fruits that have been cultivated intensively in Indonesia. The objective of this research is to determine the effect of growing media and PGPR on growth of papaya plants in the nursery and in the field .The experiment was conducted from July to December 2016 in Mekarsari field, Rancabungur District, Bogor Regency, with randomized completely block design (RCBD) with two factors and three replications. The treatments was consisted of PGPR suspension with concentration of 0, 5, 10 and 15 ml/l and growing media composition was consisted of control of soil and manure (M0), soil, manure and husk (M1), and soil, manure and cocopeat (M2) so there were 12 combinations of treatments. The results of this experiment in the nursery showed that concentration of PGPR suspension affect on plant height, stem diameter and leaf length, while in the field showed that concentration of PGPR suspension affect on plant height, number of leaves, leaf length, and leaf width, but did not affect on stem diameter of papaya plants. Composition of growing media during in the nursery did not affect to all parameters. Meanwhile, during the observations in the field, media composition of soil and manure (M0) and soil, manure and husk (M1) was able to affect on plant height and number of leaves. ABSTRAKPepaya (Carica papaya L.) merupakan salah satu buah tropika yang telah dibudidayakan secara intensif di Indonesia. Penelitian ini bertujuan untuk mengetahui pengaruh komposisi media tanam dan konsentrasi PGPR yang tepat untuk pertumbuhan bibit pepaya di pembibitan dan di lapangan. Percobaan di laksanakan pada bulan Juli hingga Desember 2016 di Kebun Mekarsari, Kecamatan Rancabungur, Kabupaten Bogor, dengan rancangan kelompok lengkap teracak (RKLT) 2 faktor dan 3 ulangan. Perlakuan terdiri atas suspensi PGPR dengan konsentrasi 0, 5, 10 dan 15 dan komposisi media tanam yang terdiri atas kontrol tanah: pupuk kandang (M0), tanah: pupuk kandang: sekam (M1), dan tanah: pupuk kandang: cocopeat (M2) sehingga terdapat 12 kombinasi perlakuan. Hasil percobaan di pembibitan menunjukkan bahwa konsentrasi suspensi PGPR mempengaruhi tinggi tanaman, diameter batang dan panjang daun, sedangkan di lapangan menunjukkan bahwa konsentrasi suspensi PGPR mempengaruhi tinggi tanaman, jumlah daun, panjang daun dan lebar daun, tetapi tidak mempengaruhi terhadap diameter batang tanaman pepaya. Komposisi media tanam selama di pembibitan tidak mempengaruhi semua parameter. Sedangkan selama pengamatan di lapangan, komposisi media tanah dan pupuk kandang (M0) dan tanah, pupuk kandang dan sekam (M1) mampu mempengaruhi tinggi tanaman dan jumlah daun. Kata kunci : agen hayati, Carica papaya L., komposisi media Bul. Agrohorti 6 (2) : 250 -257 (2018) Pengaruh Komposisi Media … 251