Consumptive water use of banana under micro irrigation using a soil-water balance approximation¹

Uso consuntivo de água da bananeira sob micro irrigação usando uma aproximação do balanço de água do solo

HIGHLIGHTS:

Time Domain Reflectometry (TDR) allows estimating soil moisture in the root zone for crop evapotranspiration studies.

Banana biomass as a ground cover with localized irrigation for banana cultivation reduces soil water evaporation.

Crop coefficients were lower than those of FAO-56 in the three vegetative phases for micro-sprinkler irrigation under cover.

ABSTRACT

DMulching contributes to the maintenance of soil moisture at reasonable levels for crop growth. It influences the crop water demand and irrigation time. The aim of this study was to estimate evapotranspiration and root water uptake by the ‘BRS Princesa’ banana cultivar through a simple approach using some components of soil water balance within the root zone in bare and mulched soil irrigated by drip and micro sprinkler systems. The experimental design was completely randomized in split plots with six replicates. The plots consisted of two irrigation systems (drip and micro sprinkler), the subplots consisted of two soil surface conditions: with and without mulch. The alternative approach for soil water percolation in the soil water balance allowed obtaining ETc under field condition with reasonable accuracy. ETc estimated from the root zone water balance is lower than ETc from FAO Penman-Monteith equation. Root water extraction in the mulched soil under drip irrigation is higher than that under micro sprinkler irrigation.

Key words:
‘BRS Princesa’; mulching; soil water storage; drip irrigation; micro sprinkler