Assessment of carbon and nitrogen distribution on several soil orders for sustainable management in dryland farming: A Case Study in Aceh Besar Regency, Indonesia

Abstract The study was based on the distribution of soil carbon and nitrogen orders in a dryland farming system Aceh Besar District, Indonesia. Soil samples were taken to represent 6 (six) drylands Besar, namely: Andisols, Entisols, Inceptisols, Mollisols, Oxisols, Ultisols. For each order, 5 observation profiles made, profile sampled at 7 (seven) depths from 0-100 cm, 0-0.05 m; 0.05-0.10 0.10-0.20m; 0.20-0.30m; 0.03-0.50m; 0.05-0.70 0.07-1.00 m so that there are 210 samples. Walkley Black method used analyze soil’s content, while Kjeldahl determine total nitrogen. C N content varies greatly depending order. highest is found depth 0.10-0.30 m. 0-1.0 Andisols order higher than other orders. topsoil (0-30 cm) ranged 0.7-6.9% varied 0.07-0.56%. according is: Andisols>Mollisols>Entisols>Inceptisols >Oxisols>Ultisols.