<![CDATA[Budidaya hidroponik belum efisien untuk digunakan, salah satu penyebabnya adalah tingginya kebutuhannutrisi. Pemanfaatan pupuk hayati diharapkan bias mengefisiensikan penggunaan nutrisi dan meningkatkanproduktivitas tanaman tomat Tujuan penelitian ini untuk mengetahui pengaruh kombinasi nutrisi anorganik danpupuk hayati terhadap populasi Azotobacter sp, serapan N, kandungan klorofil, dan hasil tanaman tomat padasistem hidroponik. Penelitian ini dilakukan pada bulan Agustus – November 2017 di Rumah Kaca KebunPercobaan Ciparanje Universitas Padjadjaran, Jatinangor, Kabupaten Sumedang, Jawa Barat. Metode penelitianini menggunakan rancangan acak kelompok (RAK). Kombinasi perlakuan terdiri atas rekomendasi nutrisianorganik dengan konsentrasi 100%, 75%, dan 50% dan rekomendasi pupuk hayati 100%, 75%, 50%, dan 25%.Variabel yang diamati meliputi populasi Azotobacter sp, kandungan klorofil, serapan N, jumlah buah tomat danbobot buah tomat. Hasil penelitian ini menunjukkan bahwa tidak terdapat pengaruh nyata pemberian nutrisianorganik dan pupuk hayati terhadap populasi Azotobacter sp, kandungan klorofil, serapan N, serta hasil tanamantomat. Pemberian perlakuan 50% nutrisi Anorganik + 100% pupuk hayati dapat meningkatkan bobot buah sebesar40% dibandingkan pemberian 100% nutrisi anorganik.Kata kunci: Azotobacter sp., klorofil, nutrisi anorganik, hydroponik, tomatABSTRACTHydroponic cultivation is not efficient because of its high demand for nutrients. Therefore, the utilizationof inorganic nutrients and biofertilizer is expected to improve the efficiency of nutrients uptake and increase theproductivity. The aim of research was to determine the effect of combination of inorganic nutrient dosage andbiofertilizer on the population of Azotobacter sp, N uptakes, chlorophyll content, and yield of tomatoes plantinhydroponic systems. This experiment was conducted on August - November 2017 at GreenhouseExperimentGarden Ciparanje Padjadjaran University, Jatinangor, Sumedang Regency, West Java. This research methodused Randomized Block Design (RBD). The treatment combination consisted of dosage recommendation ofinorganic nutrition with 100%, 75% and 50% concentrations, and 100%, 75%, 50%, and 25% of biofertilizer. Thevariables observed included the population of Azotobacter sp, chlorophyll content, N uptake, number of tomatoesand weight of tomatoes. The result of this study indicated that the effect of application both, inorganic nutrientsand biofertilizer did not significantly affect the population of Azotobacter sp, chlorophyll content, N uptakes, andyield of tomatoes. The application of 50% Inorganic nutrition + 100% of biofertilizer increased fruit weight by40% compared to 100% of inorganic nutrients.Keywords: Azotobacter sp., chlorophyll, biofertilizer, hydroponic, tomato]]>
