PENGARUH KOMBINASI PUPUK ORGANIK CAIR (POC) URIN KELINCI DAN PENGURANGAN PUPUK ANORGANIK TERHADAP PERTUMBUHAN DAN HASIL BROKOLI

The Effect of Combined Rabbit Urine Liquid Organic Fertilizer and Reduced Inorganic Fertilizer on Broccoli Growth and Yield

Abstrak

Broccoli is a high-value vegetable crop. However, excessive use of inorganic fertilizers in its cultivation poses long-term environmental risks. An alternative approach is applying rabbit urine liquid organic fertilizer (LOF), which can help maintain soil health and potentially reduce reliance on inorganic fertilizers. This research was conducted in Banjarsari Wetan Village, Banyumas, from September 2022 to January 2023, using a Randomized Complete Block Design (RCBD) with two factors. The first factor was the concentration of rabbit urine LOF (0 mL·L⁻¹, 20 mL·L⁻¹, 40 mL·L⁻¹, and 60 mL·L⁻¹). The second factor was the reduction in inorganic fertilizer dosage 0% (500 kg·ha⁻¹), 25% (375 kg·ha⁻¹), and 50% (250 kg·ha⁻¹). Data were analyzed using ANOVA followed by post-hoc test (HSD) at a=5%. The results showed the combination of rabbit urine LOF and inorganic fertilizer did not significantly affect growth parameters, including fresh and dry root weights, root volume, number of leaves, and plant height. However, a 25% reduction in inorganic fertilizer combined with 40 mL·L⁻¹ LOF significantly increased leaf area at 2 WAP (102.54 cm²) and 6 WAP (3570.48 cm²). Additionally, the combination of 60 mL·L⁻¹ LOF and no reduction in inorganic fertilizer (0%) significantly increased flower diameter (11.27 cm). The best physiological and economic flower weights were obtained with 40 mL·L⁻¹ LOF and a 25% reduction in inorganic fertilizer, yielding 231.66 g and 215.36 g, respectively. In conclusion, the optimal treatment was 40 mL·L⁻¹ LOF with a 25% reduction in inorganic fertilizer.