Changes of Soil Physical and Chemical Characteristics of Vertisol by Organic Matter and Sands Applications

Vertisol has a clay texture, high micropores, and water nutrient absorption ability. The content of causes the air to decrease, thus inhibiting root development. Stretching structure is expected increase soil porosity reduce ion absorption. This study examines interactions between organic matter percent sand on availability. was arranged according factorial Completely Randomized Design (CRD), repeated three times. first factor seven kinds (control, cow dung + banana peel compost, leaf litter compost hyacinth dung, humin, humic acid, biochar. application doses are respectively for each treatment: acid humin 20 kg ha-1, biochar 1 Mg compost+manure fertilizer 15 ha-1. Changes in chemical characteristics were evaluated against pH, C-org, Available-P, while changes physical bulk density, particle porosity. results showed that combination could improve soil. Bulk density (BD), (PD), increased with addition sand. significantly correlated improving properties biochar, manure, best percentage at 20%.