Valverde, M., Madrid, R., García, A. L., Del Amor, F. M., & Rincón, L. F. (2013). Use of almond shell and almond hull as substrates for sweet pepper cultivation. Effects on fruit yield and mineral content. Spanish Journal of Agricultural Research, 11(1), 164-172. https://doi.org/10.5424/sjar/2013111-3566