Potensi Berbagai Jenis Kompos Produk Samping Pertanian dalam Meningkatkan Populasi Azotobacter, C-Organik, N-Total Tanah, dan Hasil Tanaman Tomat pada Inceptisols

Abstrak

Inceptisols hs a potential to be developed as a growth medium for tomato cultivation. The low to
moderate fertility of Inceptisols can be improved by applying compost derived from various types of
agricultural waste, which can increase soil organic matter content, support the growth of nitrogenfixing

rhizosphere microbes such as Azotobacter sp., enhance soil fertility, and ultimately improve
tomato yield. This study aimed to analyze the effects of different types and application dosage of
agricultural waste compost on the population of Azotobacter sp., soil organic carbon, total nitrogen,
and the yield of tomato plants (Lycopersicum esculentum Mill.) grown on Inceptisols. A greenhouse
pot experiment was conducted with a Randomized Complete Block Design with ten treatments and
three replication, consisted of control (no compost) and three types of compost (rice straw, sugarcane
bagasse, and empty oil palm fruit bunches) applied at rates of 10, 15, and 20 tons ha⁻¹. The
experimenal result showed that agricultural waste compost significantly increased the population of
Azotobacter sp., soil organic carbon content, and tomato yield, but had no significant effect on total
soil nitrogen. The application of rice straw compost at a dosage of 20 tons ha⁻¹ was the most effective
treatment to increase Azotobacter sp. population, fruit weight, and the number of tomato fruits per
plant.