Pengaruh Penggunaan Bokashi Campuran Feses Sapi dan Kulit Kopi terhadap Produktivitas Rumput Gajah Mini (Pennisetum purpureum cv. Mott)

Abstract

The availability of quality forage remains an issue in Indonesian livestock farming. Dwarf elephant grass (Pennisetum purpureum cv. Mott) was chosen because it has high productivity and nutritional content. This study aims to determine the effect of using cattle manure bokashi and coffee husk on the growth and productivity of dwarf elephant grass (Pennisetum purpureum cv. Mott). The research was conducted at the Experimental Field of the Faculty of Agriculture, Universitas Sumatera Utara, from May to August 2025. This research was conducted experimentally using a completely randomized design (CRD) with five treatments: P0 = Without cow manure bokashi and coffee husk fertilizer, P1 = Given cow manure bokashi and coffee husk fertilizer 200 g/polybag, P2 = Given cow manure bokashi and coffee husk fertilizer 400 g/polybag, P3 = Given cow manure bokashi and coffee husk fertilizer 600 g/polybag, P4 = Given cow manure bokashi and coffee husk fertilizer 800 g/polybag, each treatment had 4 replicates. The growing medium for mini elephant grass in this study was ultisol soil, which was chosen because it has low nutrient content, allowing the effects of bokashi fertiliser application to be clearly observed. The research parameters were plant height, leaf length, leaf width, number of tillers, fresh weight production, and dry weight. The bokashi mixture of cow manure and coffee husks in this study contained 5.78% K, 1.41% N, 0.70% P, 35.78% organic C, and 25.37% C/N. The results of the study showed a very significant effect on plant height, leaf length, leaf width, number of tillers, fresh weight production, and dry weight, where increases in each parameter were in line with the addition of bokashi dosage. The best combination was shown in treatment P2 with a bokashi fertiliser dose of cow manure and coffee husks of 400 g/polybag. This indicates that bokashi fertiliser made from cow manure and coffee husks is suitable for use as organic fertiliser to increase the productivity of mini elephant grass.