PENGARUH PKG SERASAH KAMPUS UNPATTI DAN LIMBAH PERTANIAN TERHADAP FISIKO-KIMIA TANAH DAN HASIL JAGUNG (Zea mays L.) DI ULTISOL

Abstract

The aim of the study is to determine the effect of campus waste Granular Compost Fertilizer (GCF) and agricultural waste on soil physico-chemical and corn (Zea mays L.) in Ultisol. The research design using a randomized block design with three replications. Treatment consisted of: no fertilizer (KGSK1), with granular compost 8 t ha-1. (KGSK2), inorganic fertilizer (Urea, SP-36, and KCl),  recommended dosage (KGSK3), inorganic fertilizer + granular compost 8 t ha-1 ( KGSK4 ), ½ x dose of inorganic fertilizer + ranular compost  8 t ha-1 (KGSK5), 2 doses of inorganic fertilizer + granular compost 8 t ha-1 (KGSK6), ½ x dose of inorganic fertilizer + granular compost 12 t ha-1 (KGSK7) and 2 times the dose of inorganic fertilizer + granular compost 4 t ha-1 (KGSK8). The results showed that GCF and inorganic fertilizers significantly affect the soil physical that is categorized into heavy bulk density (0.80 g cm-3), soil particle density (2.32 g cm-3), soil porosity (7.79%), fast drainage pore (23.55%), slow drainage pore (8.84%), available water pore (11.63%), and unavailable water pore (11.31%). On the other hand, the plant growth and corn production results amounted to 249.19 cm and 7.89 tons ha-1. The combination of GCF and inorganic fertilizers can increase yields by 35%−48% compared to the application of both inorganic fertilizers and GCF. Excessive application of inorganic fertilizers did not show a significant increase in corn yields. Based on these results, the reduction of a half dose of inorganic fertilizer combined with granular compost 12 t ha-1 revealed the highest of dry shelled corn yield (7.89 t ha-1)