Nascente, A. S., Crusciol, C. A. C. and Cobucci, T. (2013) “Ammonium and nitrate in soil and upland rice yield as affected by cover crops and their desiccation time”, Pesquisa Agropecuaria Brasileira, 47(12), pp. 1699–1706. doi: 10.1590/S1678-3921.pab2012.v47.12532.