Ketersediaan Kalium Tanah Vertisol untuk Meningkatkan Hasil Tanaman Padi Hitam Melalui Penambahan Cocopeat dan Sekam

Black rice is considered capable of increasing endurance because it contains the highest anthocyanin compounds compared to other rice. In fulfilling demand for black in Sragen Regency there are still many obstacles, one which Vertisol soil. soil has low available potassium affects yields. To overcome this, cocopeat and husk were added growing medium. The purpose this study, with addition medium, was able increase K-available so that yield increased. research carried out March-August 2021 at UPT Agriculture Service. Soil chemical analysis Laboratory Chemistry Fertility FP UNS. This study using an RCBD two factors, first factor a mixture medium (M): M0: Control (soil), M1: Mixture M2: husk, second variety (V): V1: Cempo Ireng rice, V2: Jlitheng V3: YR07 From 9 treatment combinations obtained repeated 3x 27 polybags. Data analyzed by F test 5% level then followed DMR level. results showed not soil, but amount filled grain treatments. Keywords: Planting media, K-Available.