Effect of Dosage of Shellfish Compost Fertilizer and Bio Fertilizer Trichoderma sp. on Vegetative Growth of Soybean Grobogan Variety

This study investigated the effects of camphor compost and Trichoderma sp biofertilizer on the vegetative growth of Grobogan soybean varieties. Conducted from May to July 2024 in Suko Village, Sidoarjo District, the research utilized a factorial Group Random Design (RAK) with two factors. The first factor was camphor compost at doses of 50 grams/polybag, 100 grams/polybag, and 150 grams/polybag. The second factor was Trichoderma sp biofertilizer at 100 grams/polybag. Each treatment was replicated four times, resulting in 32 experimental units. Variables observed included plant height, number of leaves, number of branches, leaf area, and number of flowers. Data analysis via ANOVA followed by the Honest Significant Difference (HSD) test revealed a significant interaction at 35 days after sowing (DAS) for plant height and number of leaves, notably in the treatment with 100 grams of compost and 100 grams of Trichoderma sp biofertilizer (P2T1).