Update Artikelilmiah: 13837

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Abstrak (Bhs. Indonesia)

Penelitian ini bertujuan untuk: 1) Mengetahui dosis pupuk NPK yang tepat terhadap pertumbuhan bibit tanaman jambu air citra dan ketahanan terhadap penyakit karat putih, 2) Mengetahui konsentrasi pupuk daun yang tepat terhadap pertumbuhan bibit tanaman jambu air citra dan ketahanan terhadap penyakit karat putih, 3) Mengetahui peran Bacillus sp. terhadap pertumbuhan bibit tanaman jambu air citra dan ketahanan terhadap penyakit karat putih, 4) mengetahui interaksi antara pupuk NPK, pupuk daun, dan Bacillus sp. Penelitian dilaksanakan di laboratorium perlindungan tanaman bagian penyakit tanaman Fakultas Pertanian dan Rumah Plastik Universitas Jenderal Soedirman Purwokerto. Waktu penelitian dimulai dari bulan Desember 2014 sampai dengan bulan Mei 2015. Rancangan yang digunakan adalah Rancangan Acak Kelompok Lengkap (RAKL) dengan 3 faktor yaitu, penggunaan dosis pupuk NPK, konsentrasi pupuk daun, dan penggunaan Bacillus sp. Variabel yang diamati yaitu jumlah daun, luas daun, tinggi tanaman, jumlah cabang, intensitas penyakit, uji senyawa fenol, dan lingkungan. Hasil penelitian bahwa dosis pupuk NPK 30 g/tanaman dan 40 g/tanaman belum mampu meningkatkan pertumbuhan bibit tanaman jambu air citra dan ketahanan terhadap penyakit karat putih. Konsentrasi pupuk daun 1 g/l dan 2 g/l belum mampu meningkatkan pertumbuhan bibit tanaman jambu air citra dan ketahanan terhadap penyakit karat putih. Bacillus sp. mampu menurunkan intensitas penyakit karat putih pada bibit tanaman jambu air citra sebesar 36,18%.

Abtrak (Bhs. Inggris)

This research aimed to: 1) Determined proper NPK fertilizer dosage for watery rose apple var. citra seedling growth and its resistance to white rust disease, 2) Determined proper foliar fertilizer concentration for watery rose apple var. citra seedling growth and its resistance to white rust disease, 3) Determined the role of Bacillus sp. for watery rose apple var. citra seedling growth and its resistance to white rust disease, 4) Determined the interaction between NPK fertilizer, foliar fertilizer, and Bacillus sp. This research conducted from December 2014 to May 2015 at Screenhouse and Plant Protection Laboratory, Faculty of Agriculture, Jenderal Soedirman University, Purwokerto. This research used completely Randomized Block design with 3 factors. The factors were NPK dosage, foliar fertilizer concentration, and Bacillus sp. application. Observed variables were number of leaves, leaf area, plant height, number of branches, disease intensity, phenolic compound test, and surrounding environment. The result showed that 30 and 40 g NPK per plant were not able to increased watery rose apple var. citra seedling growth and its resistance to white rust disease. Foliar fertilizer for 1 and 2 g/l were not able to increased watery rose apple var. citra seedling growth and its resistance to white rust disease. Bacillus sp. was able to decreased white rust disease intensity on watery rose apple var. citra for 36,18%.

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