Suhartanto, E. and Safitri, L. 2020. TREN PERUBAHAN CROP WATER PRODUCTIVITY KAKAO (Theobroma cacao L. ) DI D.I. YOGYAKARTA. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering). 9, 3 (Sep. 2020), 237–247. DOI:https://doi.org/10.23960/jtep-l.v9i3.237-247.