Irrigation controller mechanically actuated by soil-water tension: II - field evaluations - Almeida, Alexsandro C. S; Botrel, Tarlei Arriel; Raine, Steven R.; Camargo, Antonio Pires de; Pinto, Marinaldo Ferreira; Salvador, Conan Ayade (Revista Brasileira de Engenharia Agrícola e Ambiental, 2017)