Evapotranspiration and crop coefficients of corn in monoculture and intercropped with jack bean

Araújo, Mário Sérgio Paiva de; Sousa, Elias Fernandes de; Pereira, Vinícius R.; Ferreira, Fernando H. A.; Carvalho, Daniel Fonseca de

doi:10.1590/1807-1929/agriambi.v21n1p27-31

Cited by 4 publications

(9 citation statements)

References 12 publications

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“…This indicates that the accuracy of the crop coefficient method will be considerably lower than that of shown (Figure 9), in line with several studies (Corbari et al, 2017;de Araújo et al, 2017;Odhiambo & Irmak, 2012 Yan and Shugart (2010), which relates RH and potential ET to actual ET. In parallel with their work, decades of research has been devoted to validate the Bouchet's CR hypothesis since the CR is proven to be valid on any timescale such as half-hourly (Zhu et al, 2016), daily (Kim et al, 2019), 8-day (Yan & Shugart, 2010), or annually (Brutsaert et al, 2020).…”

Section: Arem Versus the Crop Coefficient Methodssupporting

confidence: 86%

“…This indicates that the accuracy of the crop coefficient method will be considerably lower than that of shown (Figure 9), in line with several studies (Corbari et al, 2017;de Araújo et al, 2017;Odhiambo & Irmak, 2012 (Zhu et al, 2016), daily (Kim et al, 2019), 8-day (Yan & Shugart, 2010), or annually (Brutsaert et al, 2020). This will put forward the assumption that there must be a physical meaning behind the interactions found in this study; thus, an attempt for its understanding as a future work is strongly encouraged.…”

Section: Arem Versus the Crop Coefficient Methodssupporting

confidence: 83%

“…whereas 3D heterogeneity in soil type (SSURGO, 2014) on one hand, and imprecise soil moisture quantification at different vertical layers at regional scale (Charoenhirunyingyos et al, 2011) on the other hand, will result in inaccuracy in the estimates (de Araújo et al, 2017).…”

Section: Crop Coefficient Methodsmentioning

confidence: 99%

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A meteorological‐based crop coefficient model for estimation of daily evapotranspiration

Varmaghani

Eichinger

Prueger

2021

Hydrological Processes

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Estimation of daily evapotranspiration (ET) over cloudy regions highly desires models which rely on meteorological data only. Notwithstanding, the conventional crop coefficient (K c) method requires detailed knowledge of geo/biophysical properties of the coupled land-vegetation system, precipitation, and soil moisture. Six Eddy Covariance (EC) towers in Iowa, California and New Hampshire of the USA (covering corn, soybeans, prairie, and deciduous forest) were selected. Investigation on 6 years (2007-2012) 15-min micrometeorological records of these sites revealed that there is an indubitable strong interaction between relative humidity (RH), reference ET (ET o), and actual ET at different timescales. This allowed to bypass the need for the non-meteorological inputs and express K c as a second-order polynomial function of RH and ET o , the ambient regression evapotranspiration model (AREM). The coefficients of the empirical function are crop-specific and may require calibration over different soil types. The mean absolute percentage error (MAPE) of the regression against daily EC observations was 17% during the growing season, and 32% throughout the year with root mean square error (RMSE) of 0.74 mm day −1 and coefficient of determination of 0.71. The model was fully operational (MAPE of 34% and RMSE of 0.82 mm day −1) over the four Iowan sites based on inputs from local weather stations and NLDAS-2 forcing data of NASA. AREM was capable of capturing the dynamics of ET at 15-min and daily timescales irrespective of varying complexities associated with biophysical, geophysical and climatological states.

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Section: Arem Versus the Crop Coefficient Methodssupporting

confidence: 86%

“…This indicates that the accuracy of the crop coefficient method will be considerably lower than that of shown (Figure 9), in line with several studies (Corbari et al, 2017;de Araújo et al, 2017;Odhiambo & Irmak, 2012 (Zhu et al, 2016), daily (Kim et al, 2019), 8-day (Yan & Shugart, 2010), or annually (Brutsaert et al, 2020). This will put forward the assumption that there must be a physical meaning behind the interactions found in this study; thus, an attempt for its understanding as a future work is strongly encouraged.…”

Section: Arem Versus the Crop Coefficient Methodssupporting

confidence: 83%

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A meteorological‐based crop coefficient model for estimation of daily evapotranspiration

Varmaghani

Eichinger

Prueger

2021

Hydrological Processes

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“…. In an intercropping system, studies show that maize has an average evapotranspiration demand between 315.00 and 420.00 mm during an average cycle of 110 to 115 days, with greater water demand compared to single maize (Araújo et al, 2017). The ideal temperature range for the development of the maize crop is 19 to 34 °C, with limits between 10 and 34 °C, so temperatures below 10 °C and above 34 °C damage the development capacity of the maize crop (Cruz et al, 2008;Francisco et al, 2017).…”

Section: Meteorological Elementsmentioning

confidence: 99%

Crotalaria Sowing Times Intercropped with Off-Season Maize in the Variability of Soil Temperature and Moisture

Daniel

Dallacort

Barbieri

et al. 2022

JAS

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The thermal regime and the dynamics of soil moisture affect crop yield. Therefore, there is a need to understand the extent to which the intercropping system modifies the variability of soil temperature and moisture conditions for optimal growth and yield of the maize crop. This study aimed to evaluate the influence of different sowing times of crotalaria in an intercropping system with irrigated and non-irrigated off-season maize in the variability of soil temperature and moisture. The experiment consisted of twelve treatments, consisting of different cropping systems (intercropping): maize in a single crop (MS); sowing of crotalaria simultaneous with maize (MCS); sowing of crotalaria with maize in the VE stage (MCVE); sowing of crotalaria with maize in stage V2 (MCV2); sowing of crotalaria with maize in stage V4 (MCV4); sowing of crotalaria with maize in stage V6 (MCV6), in irrigated and non-irrigated systems. Soil temperature was monitored at depths of 10, 20, 30 and 40 cm, and soil moisture was monitored at a depth of 20 cm using "K-type" thermocouple sensors and time domain reflectometry (TDR) probes, which were all connected to a Datalogger and programmed to store the collected data at 15-minute intervals. Irrigation was carried out with a uniformity coefficient greater than 80% and a water depth of 10.38 mm h-1 with a sprinkler system. The intercropping of maize with crotalaria provides the soil with a smaller range of soil temperature, with higher values in the system without irrigation compared to the irrigated system. Soil moisture was lower in the single maize treatment, as it increased soil water evaporation compared to the intercropping treatments. In the irrigated system, the soil moisture was higher at 0.010 m3 m-3 in relation to the system without irrigation. The irrigated system obtained better results for maize yield than the non-irrigated system.

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“…For maize crop, the maximum, minimum and mean values of crop evapotranspiration (ETc) were, respectively, 5.86 mm d , a minimum of 0.87 mm d -1 and an average of 3.88 mm d -1 . Studies cite that the water demand in a consortium system tends to be higher than the intercropping system [30,31].…”

Section: Crop Evapotranspirationmentioning

confidence: 99%

Evapotranspiration and Dual Crop Coefficient of Maize Second Season Intercropped with Crotalaria

Daniel

Dallacort

Barbieri³

et al. 2020

JEAI

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The objective of this work was to determine the dual coefficient of culture (Kc) of maize in monoculture and intercropping systems, as well as to evaluate the influence of intercropping on evapotranspiration and productive characteristics of maize second season. The experiment was carried out in the experimental field of the State University of Mato Grosso - UNEMAT in 2018, with three treatments: T1 - maize monoculture; T2 - Crotalaria monoculture and T3 - maize + Crotalaria. The crop evapotranspiration (ETc) of maize, Crotalaria, and maize + Crotalaria intercropping was determined daily by weight variation of weighing lysimeters, converted into mm day-1. The methodology used was that of dual Kc - FAO 56, dividing the crop coefficient (Kc), in soil evaporation coefficient (Ke), determined in microlysimeters, and basal crop coefficient (Kcb), determined in weighing lysimeters. The phenological phases of the maize crop were observed to determine the coefficients in the different developmental stages, being the Kc, Kcb, Ke in the phases: Initial (I), Development (II), Intermediate (III) and Final (IV). The accumulated culture evapotranspiration was 312.00; 436.16 and 422.38 mm and daily averages of 2.86; 4.00- and 3.88-mm d-1, respectively for monoculture maize, for Crotalaria and for intercropping. The Kc values for each phase of maize development in intercropping with crotalaria were: I (1.46); II (1.48); III (1.59) and IV (0.94). For maize monoculture, dual Kc values were: I (1.24), II (1.30), III (1.00) and IV (1.11) and for Crotalaria monoculture were: I (1.77), II (1.59), III (1.56) and IV (1.05).

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Evapotranspiration and crop coefficients of corn in monoculture and intercropped with jack bean

Cited by 4 publications

References 12 publications

A meteorological‐based crop coefficient model for estimation of daily evapotranspiration

A meteorological‐based crop coefficient model for estimation of daily evapotranspiration

Crotalaria Sowing Times Intercropped with Off-Season Maize in the Variability of Soil Temperature and Moisture

Evapotranspiration and Dual Crop Coefficient of Maize Second Season Intercropped with Crotalaria

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