Water balance and crop coefficient for the ‘Folha Murcha’ orange in the northwest region of Rio de Janeiro

Moraes, Jean Gomes de; Marciano, Cláudio Roberto; Amaral, Clinimar Oliveira; Sousa, Elias Fernandes de; Marinho, Cláudia Sales

doi:10.5935/1806-6690.20150003

Cited by 1 publication

(1 citation statement)

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“…Furthermore, for citrus species, experimental results show that Kc may vary with soil and climatic conditions, owing to the higher inner resistances to water transport (MARIN & ANGELOCCI, 2011). The Kc values for citrus for the mid-seasonstageare widely reported in literature (e.g., SEPASKHAH et al, 1995;MORAES et al, 2015), but Kc data for the initial development stage are still scarce. Therefore, Kc values during the initial stage of citrus development need to be evaluated for each local condition.…”

Section: Introductionmentioning

confidence: 99%

Actual evapotranspiration and crop coefficient of sweet orange during the initial development phase in the Rio Largo region, Alagoas

et al. 2019

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Determining actual crop evapotranspiration (ETa) is paramount for irrigation management. The principal measurement methods and physical models generally require crop and weather data that are not readily available. We determined the crop coefficient (Kc) of sweet oranges during the initial development stage and evaluated the performance of the Poulovassilis semi-empirical model coupled with a simple soil water balance for estimating the ETa. The ETa was inferred from the variation in the soil water content over time, measured by time-domain reflectometry. In the Poulovassilis model, the ETa is obtained by multiplying the crop evapotranspiration (ETc) by an adjustment coefficient (ca), which accounts for a reduction in the evapotranspiration caused by soil water depletion. Soil water storage was obtained using the daily and 10-day soil water balances, computed by considering inputs and outputs of water from the system. The empirical parameter, ca, was determined using inverse modeling. The optimal ca value obtained through inverse modeling was 0.05 and 0.03 for the daily and 10-day soil water balances, respectively. The model performed better for the daily soil water balance than the 10-day balance, with performance comparable with the other ETa models. Average Kc during the sweet orange initial crop stage was 0.85.

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Section: Introductionmentioning

confidence: 99%