Composition of organic compost prepared with equine manure and leucena (LeucaenaleucocephalaLam de Wit)

Abstract

This project was carried out at the school farm of the State University of Maranhão (Fazenda Escola da Universidade Estadual doMaranhão – UEMA), for evaluating the chemical composition of the equine manure compost with leucaena in different proportions. The treatments were T1, witness, pure equine manure. T2, 75 Kg of equine manure + 25 Kg of leucaena; T3, 50 Kg of equinemanure + 50 Kg of leucaena; T4, 25 Kg of equine manure + 75 Kg of leucaena. After 67 days of the beginning of the composting,resulting samples from each treatment were collected for chemical composition analysis: Organic Matter level (OM), pH,Phosphorus (P), Potassium (K), Calcium (Ca), Magnesium (Mg), Hydrogen and Aluminum (H + Al), Carbon, and Nitrogen.According to the obtained results, the treatments statistically differed from one another when related to the evaluated parameters:T2 (75 Kg of equine manure + 25 g of leucaena) presented high values compared to the witness (T1), in the OM levels (14,9%); P(857mg/dm3); and Mg (77,5 nmol/dm3), associated to a low acidity pH (6,5), resulting in an excellent quality compost. Alltreatments present chemical characteristics within satisfactory levels in terms of soil fertility required by most of species cultivated in Brasil