The aim of this work was to evaluate the yield and water use efficiency (WUE) of banana ?Prata-Anã? (AAB) and ?BRS Platina? (AAAB) during two cycles of production in a semi-arid climate of Brazil (classified as Aw according Köppen)

COELHO FILHO, M. A.

COELHO, E. F.

DONATO, S. L. R.

LUCENA, C. C. de

SANTOS, M. R.

SIQUEIRA, D. L.

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WATER USE EFFICIENCY IN BANANAS POME TYPE CROPSUSINGEMPIRICAL COEFFICIENT BASED ON LEAF AREALucena, CC1, Coelho Filho, MA1, Donato, SLR2, Santos, MR2, Siqueira, DL3,Coelho, EF1mauricio-antonio.coelho@embrapa.br1Embrapa Mandioca e Fruticultura, Cruz das Almas, Brasil2Instituto Federal Baiano – campus Guanambi, Guanambi, Brasil3Universidade Federal de Viçosa, Viçosa, BrasilThe aim of this work was to evaluate the yield and water use efficiency (WUE) ofbanana ‘Prata-Anã’ (AAB) and ‘BRS Platina’ (AAAB) during two cycles of productionin a semi-arid climate of Brazil (classified as Aw according Köppen). The plants wereirrigated by drip irrigation and were evaluated five levels of irrigation (IR). A simplemodel to estimating plant transpiration (Coelho Filho et al., 2004) was used for thecalculus of IR. The model is based on reference evapotranspiration (ETo) andevolution of plant total leaf area (plants of the “family”): IR = K.AF.ETo. We achievedthe five levels of RI by varying the values for the empiric transpiration coefficient (K)(0,20; 0,35; 0,50; 0,65) and a treatment based on crop coefficient (Kc): ETc =ETo.Kc. The greater values of WUE were obtained using the low levels of RI (K = 0.2and 0.35) but these treatments reduce the plant productivity in the second cyclewhich were higher on high levels of irrigation (K = 0.50; K = 0.65 and Kc). Analyzingthe WUE of these three treatments and varieties, we have concluded that by usingK=0.5 is possible to equalize well the relation between yield and WUE. For scenariosof water scarcity is possible achieve high levels of WUE (38 kg mm-1) in the secondcycle of production using the low value of K (0.2) with an impact of 15% on the plantyield.

Water use efficiency in bananas pome type cropsusing empirical coefficient based on leaf area.

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