Zheng, W., Li, Y., Gong, Q., Zhang, H., Zhao, Z., Zheng, Z., Zhai, B. and Wang, Z. 2017. Improving yield and water use efficiency of apple trees through intercrop-mulch of crown vetch (Coronilla varia L.) combined with different fertilizer treatments in the Loess Plateau. Spanish Journal of Agricultural Research. 14, 4 (Jan. 2017), e1207. DOI:https://doi.org/10.5424/sjar/2016144-9575.