Application of organic fertilizer and phosphate solubilizing bacteria to increase the growth and yield of potatoes in Andisol

Andisol has low phosphate (P) nutrient content due to high P fixation by allophane minerals, which affects crop production. The application of organic fertilizers and solubilizing bacteria can increase the availability in soil order production potato plants. This study aimed evaluate effect different types fertilizer (PSB) on research was conducted from August November 2020 installation assessment agricultural technology Berastagi, Karo Regency, with an altitude ± 1,340 m above sea level is Andisol. experimental design used a factorial randomized completely block four replications. first factor type (liquid chicken manure) second {without PSB (control), Bacillus cereus , pseudomycoides amyloliquefaciens }. Results showed that manure able growth yield potatoes per plot. Phosphate B. could yields. interaction 33.79% - 56.24% percentage big tubers 32.60% 70.23% decrease grade small 43.61% 72.32% compared without PSB. fertilization had potential be applied for increasing Keywords : sp fertilizer, Solanum tuberosum Abstrak memiliki kandungan hara yang rendah karena fiksasi tinggi oleh mineral alofan, mempengaruhi produksi tanaman. Aplikasi pupuk organik dan bakteri pelarut fosfat dapat meningkatkan ketersediaan dalam tanah untuk tanaman kentang. Penelitian ini bertujuan mendapatkan jenis (BPF) terbaik kentang pada andisol. dilaksanakan bulan Agustus sampai dengan di Instalasi Pengkajian Teknologi Pertanian Berastagi Kabupaten ketinggian tempat 1.340 dpl ordo Rancangan digunakan adalah rancangan acak kelompok faktorial empat ulangan. Perlakuan diteliti pertama (pupuk cair kotoran ayam) faktor kedua {tanpa BPF (kontrol), cereus, Hasil penelitian menunjukkan bahwa kandang ayam mampu pertumbuhan hasil Bakteri Interaksi sebesar 33,81% 56,26% persentase umbi besar 32,60% 70,23% menurunkan kecil 43,61% 72,32% dari tanpa BPF. Kata kunci sp, organik,