Pujiyanto, P. 2011. Use of Sub-Surface Soil Water in Robusta Coffee Field Through Organic Matter Wicks. Pelita Perkebunan (a Coffee and Cocoa Research Journal). 27, 3 (Dec. 2011). DOI:https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v27i3.156.