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PUTRI LAESHITA

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Abstrak (Bhs. Indonesia)

Penelitian ini bertujuan untuk mengetahui pengaruh biobakterisida berbasis Bacillus subtilis B1 terhadap 1)  pertumbuhan dan hasil padi, 2) penekanan penyakit hawardaun bakteri, 3)waktu aplikasi optimum  dalam meningkatkan pertumbuhan, hasil dan penekanan penyakit hawar daun bakteri padi.
Penelitian dilaksanakan di Laboratorium Perlindungan Tanaman, Fakultas Pertanian, Universitas Jenderal Soedirman serta penelitian di lapangan dilaksanakan di dataran medium Desa Kebumen, Kecamatan Baturraden, Purwokerto, pada tanah inseptisol, di ketinggian 230 mdpl. Aplikasi formula biopestisida berbasis B.subtilis B1 bentuk cair dan padat pada tanaman padi di lapangan dilakukan dengan menggunakan Rancangan Acak Kelompok (RAK) dan diulang sebanyak 6 kali. Perlakuan yang dicoba yaitu: A (Kombinasi formula biopestisida berbasis B.subtilis B1 bentuk cair dan padat yang diberikan 10 hari setelah tanam), B (Kombinasi formula biopestisida berbasis B.subtilis B1 bentuk cair dan padat yang diberikan 20 hari setelah tanam), C (Kombinasi formula biopestisida berbasis B.subtilis B1 bentuk cair dan padat yang diberikan 30 hari setelah tanam), K (tanpa pemberian formula biopestisida B.subtilis B1 baik cair maupun padat). Variabel yang diamati adalah tinggi tanaman, bobot per petak efektif, bobot kering tanaman, panjang malai, volume akar, panjang akar terpanjang, masa inkubasi, intensitas penyakit, laju infeksi, dan AUDPC (Area Under Diseases Progress Curve). Analisis data dilakukan dengan uji F apabila berbeda nyata dilanjutkan dengan BNT 5%. Hasil penelitian menunjukkan bahwa biobakterisida berbasis B.subtilis B1 belum mampu meningkatkan pertumbuhan dan hasil padi sawah. Biobakterisida berbasis B.subtilis B1 dapat menekan intensitas penyakit hawar daun bakteri sebesar 25,35% pada aplikasi 10 hari setelah tanam. Waktu aplikasi optimum pemberian biobakterisida berbasis B.subtilis B1 dalam meningkatkan pertumbuhan adalah 30 hari setelah tanam, untuk hasil padi adalah 21 hari setelah tanam, sedangkan  dalam menekan penyakit hawar daun bakteri adalah 16 hari setelah tanam.

Abtrak (Bhs. Inggris)

This objective of the research are knowing the effect of biobactericide Bacillus subtilis B1 on the 1) growth and yield in rice, 2) the suppression of bacterial leaf blight, 3) the optimum application time to improve the growth, yield and suppress the bacterial leaf blight disease in rice.
The experiment was conducted at the Laboratory of Plant Protection, Faculty of Agriculture, Jenderal Soedirman University and  field research conducted in plain medium Kebumen Village, District Baturraden, Purwokerto, on inceptisol soil, at an altitude of 230 masl. Application biopesticide B.subtilis B1in liquid and solid formula in the field is done by using a randomized completely block design (RCBD) and repeated 6 times. Treatment was attempted, namely: A (Combination of formula based on biopesticides B.subtilis B1 liquid and solid form were given 10 days after planting), B (Combination of formula based on biopesticides B.subtilis B1 liquid and solid forms were given 20 days after planting), C (Combination of formula based on biopesticides B.subtilis B1 liquid and solid forms were given 30 days after planting), K (without giving biopesticides formula B1 B.subtilis both liquid and solid). The variables measured were plant height, effective seed weight per plot, plant dry weight, panicle length, root volume, the longest root, incubation period, the intensity of the disease, the rate of infection, and AUDPC(Area Under Diseases Progress Curve). Data was analyzed by F test if there was effect then followed by LSD at the level of 5%. The results showed that biobactericide B.subtilis B1 had not been yet able to increase the growth and yield of rice. Biobactericide based on B.subtilis B1 can suppress bacterial leaf blight disease intensity up to 25.35% on the application 10 days after planting. Optimum application time of biobactericide B.subtilis B1 in promoting growth was 30 days after planting,  increasing of rice yield was 21 days after planting and in suppressing bacterial leaf blight disease was 16 days after planting.

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