Determination of wheat crop coefficient (Kc) and soil water evaporation (Ke) in Maringa, PR, Brazil

Paulo, Vinicius Demeneck Vieira; Paulo, Sergio Lourenco de Freitas; Andre, Luiz Biscaia Ribeiro da Silva; Heraldo, Takao Hashiguti; Rezende, R. M.; Cleonir,

doi:10.5897/ajar2016.11377

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…In Maringá, PR, Brazil, researchers determined the crop coefficient of wheat in weighing lysimeters and soil water evaporation coefficient by mini-lysimeters (Vieira et al, 2016). The values determined were 0.67, 0.67, 1.01, 1.03 and 0.42, for the stages of tillering, stem elongation, panicle growth, flowering and maturation, respectively.…”

Section: Resultsmentioning

confidence: 99%

Evapotranspiration and crop coefficients in two irrigated wheat cultivars

Silva

Bonfim-Silva

Fenner

et al. 2020

Rev. bras. eng. agríc. ambient.

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In the state of Mato Grosso, Brazil, wheat is an alternative to the current production system, mainly in irrigated crops, with new cultivars improved for this environment and system. The objective was to determine the evapotranspiration of the irrigated wheat crop and the dual coefficients of cultivars for the Brazilian Midwest. The experiment was conducted in the field using 12 weighing lysimeters and mini-lysimeters, filled by soil monoliths. The wheat cultivars BRS-254 and BRS-394 were used in the first and second years, respectively. Reference evapotranspiration was obtained by the Penman-Monteith equation and crop evapotranspiration by the mass difference in the lysimeters. Basal crop coefficient and soil water evaporation coefficient were determined according to the crop development stages in both years of cultivation. The mean ETc and ETo values were 3.87, 3.49 mm d-1 and 4.10 and 3.23 mm d-1, respectively, in the first and second cultivation cycles, with higher values of ETc recorded in the reproductive stages of the crop, flowering and grain filling. The basal crop coefficients and soil water evaporation coefficients estimated by weighing lysimeters composed of soil monoliths are: Kcb - 0.42, 0.78, 0.94, 0.74 and 0.47 and Ke - 0.72, 0.52, 0.39, 0.58 and 0.13 for the cultivar BRS-254, and Kcb - 0.28, 0.27, 0.65, 0.98 and 0.66 and Ke - 1.04, 0.96, 0.65, 0.34 and 0.51 for the cultivar BRS-394, at the stages of emergence, tillering, flowering, maturation and harvest, respectively.

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Section: Resultsmentioning

confidence: 99%

Evapotranspiration and crop coefficients in two irrigated wheat cultivars

Silva

Bonfim-Silva

Fenner

et al. 2020

Rev. bras. eng. agríc. ambient.

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“…It has been widely used with good results for numerous crops under different conditions: e.g. wheat and maize in semi-arid regions (Shahrokhnia and Sepaskhah, 2013), wheat in humid climate (Vieira et al, 2016), cherry trees in temperate continental monsoon climate (Tong et al, 2016), irrigated eucalyptus (Alves et al, 2013), and canola in terrestrial climate (Majnooni-Heris et al, 2012).…”

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confidence: 99%

Modelling groundwater recharge, actual evaporation and transpiration in semi-arid sites of the Lake Chad Basin: The role of soil and vegetation on groundwater recharge

Neukum

Santos

Ronelngar

et al. 2021

Preprint

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Abstract. The Lake Chad Basin, located in the center of North Africa, is characterized by strong climate seasonality with a pronounced short annual precipitation period and high potential evapotranspiration. Groundwater is an essential source for drinking water supply as well as for agriculture and groundwater related ecosystems. Thus, assessment of groundwater recharge is very important although difficult, because of the strong effects of evaporation and transpiration as well as limited available data. A simple, generalized approach, which requires only a small number of field data, freely available remote sensing data, and well-established concepts and models, is tested for assessing groundwater recharge in the southern part of the basin. This work uses the FAO-dual Kc concept to estimate E and T coefficients at six locations that differ in soil texture, climate, and vegetation conditions. Measured values of soil water content and chloride concentrations along vertical soil profiles at these locations together with different scenarios for E and T partitioning and a Bayesian calibration approach are used to numerically simulate water flow and chloride transport. Average potential groundwater recharges and the associated model uncertainty at the six locations are assessed for the time-period 2003–2016. Model results show that interannual variability of groundwater recharge is generally higher than the uncertainty of the modelled groundwater recharge. Furthermore, the soil moisture dynamics at all locations are limited by water availability for evaporation in the uppermost part of the soil and by water uptake in the root zone rather than by the reference evapotranspiration.

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