Water requirements of the tomato in the valley of Cavaco in Benguela, Angola
Rogério Mossande. A., Brown Manrique O., Mujica Cervantes A.
Gobierno Provincial de Benguela, Angola. Universidad de Ciego de Ávila (UNICA), Centro de Estudios Hidrotécnicos (CEH), Ciego de Ávila, Cuba.
Soil and water.
Revista Ciencias Técnicas Agropecuarias, ISSN -1010-2760, RNPS-0111, Vol. 24, No.2 (abril-mayo-junio, pp. 5-10), 2015, Cuba.
A research for the determination of crop water requirements of tomato (Lycopersicum esculentum) with the use of a drip irrigation system powered by photovoltaic energy was carried out in the Cavaco Valley, Benguela province, in Angola. The reference evapotranspiration (ETo) was calculated using the Penman Monteith method and crop evapotranspiration (ETc) from the water balance equation on the ground. The value of Kc is defined to relate ETc/ETo. The study of the dynamics of crop phenology was performed by direct observations after planting day. Setting Kc to the initial, intermediate and final stage was conducted according to the Allen’s methodology.
The results indicate Kc values of 0.51; 1.17 and 0.60 in the initial, intermediate and final stages, which in the intermediate and final stages were similar to those tabulated Kc values suggested by FAO and adjusted to the conditions of the locality, but differ slightly in the initial phase by 1.7% and 3.5% respectively. Crop evapotranspiration reached values of 2.4; 5.6 and 3.5 mm/day for each phenological stage. In all phenological cycle a crop evapotranspiration of 432.4 mm was reached.