Estimation method of grass net radiation on the determination of potential evapotranspiration

Pereira, Antônio Serafim; Nova, Nílson Augusto Villa; Pires, Luiz F.; Angelocci, Luiz Roberto; Beruski, Gustavo Castilho

doi:10.1002/met.1346

Cited by 10 publications

(9 citation statements)

References 24 publications

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“…During the day, average ET D rates were mainly governed by the environmental variables R n and VPD (both very strong correlations) which agrees well with previous studies (Liu et al, ; Pereira et al, ; H. Wang et al, ). Variables like RH , T a , and T s showed a strong correlation with average ET D rates.…”

Section: Resultssupporting

confidence: 91%

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Groh

Pütz

Gerke

et al. 2019

Water Resources Research

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Evapotranspiration (ET) is, after precipitation, the second largest flux at the land surface in the water cycle and occurs mainly during daytime. Less attention has been given to water fluxes from the land surface into the atmosphere during nighttime (i.e., between sunset and sunrise). The nighttime ET (ETN) may be estimated based on models that use meteorological data; however, due to missing experimental long‐term data, the verification of ETN estimates is limited. In this paper, the amount of ETN for two grassland ecosystems was determined from highly temporally resolved and precise weighing lysimeter data. We found that annual ETN ranged between 3.5% and 9.5% of daytime annual ET (ETD) and occurred mainly during wet soil and canopy surface conditions, which suggests that ETN is largely related to evaporation. ETN was positively correlated with wind speed. Dew formation, ranging from 4.8% to 6.4% of annual precipitation, was in absolute terms larger than ETN. The prediction of ETN with the Penman‐Monteith model improved if the aerodynamic and surface resistance parameters were based on vegetation height observations and the nighttime stomatal resistance parameter was assumed to be zero. The occurrence of hot days during the observation period showed to increase average ETN rates. Our results suggest that ETN can be observed with precision weighing lysimeters, was a not negligible component in the water balance of the grassland ecosystems, and thus needs more attention when simulating land surface hydrological processes.

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Section: Resultssupporting

confidence: 91%

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Groh

Pütz

Gerke

et al. 2019

Water Resources Research

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“…The choice of the ETo method is justified by its robustness and accuracy (Valiantzas, 2013). Furthermore, Pereira et al (2014) used different methods to estimate the ETc of Paspalum notatum Flügge, in Piracicaba, SP, and observed that the PM-FAO 56 method revealed the highest agreement (R 2 = 0.94) with the field measurements of ETo.…”

Section: Crop Coefficients Of Forage Cropsmentioning

confidence: 99%

“…Agric. v.76, n.6, p.448-458, November/December 2019 characteristics of this intercropping may have contributed to these values, since these grasses are small in size and covered all the soil, similar to Paspalum notatum, which is the grass used as the standard when measuring ETo (Pereira et al, 2014).…”

Section: Crop Coefficients Of Forage Cropsmentioning

confidence: 99%

Crop coefficients of tropical forage crops, single cropped and overseeded with black oat and ryegrass

Sanches

Souza

Jesus

et al. 2019

Sci. agric. (Piracicaba, Braz.)

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Crop coefficient (Kc) is the ratio between crop evapotranspiration (ETc) and reference evapotranspiration (ETo), representing the phenological effects on crop water consumption. Kc is fundamental to estimating ETc by agrometeorological methods. This research study aimed to determine Kc and ETc values for Guinea grass (Megathyrsus maximus cv. Mombaça) and Bermuda grass (Cynodon spp.), both single cropped for one year and overseeded with black oat (Avena strigosa) and ryegrass (Lolium multiflorum) during fall/winter. The experiment in the field comprised four plots, two for each tropical forage, with and without overseeding. At the center of each plot, there was a weighing lysimeter with an automated system for data collection. ETc was measured daily over four seasons following the lysimetric method; ETo was calculated using the Penman-Monteith equation. ETc and ETo values were used to estimate Kc values. The single cropped Guinea grass showed the highest values for ETc, with mean ETc and Kc of 3.99 mm d-1 and 1.07, respectively. The single cropped Bermuda grass showed ETc and Kc values of 3.57 mm d-1 and 0.96, respectively. The results of paired t-testing for Kc showed no significant differences (p = 0.05) between single cropped and intercropped for both Guinea grass and Cynodon spp. During winter, intercropped Guinea grass did not show an ETc significantly higher than single cropped Guinea grass, with mean Kc values 0.98 for intercropped and 1.10 for single cropped. Similarly, Bermuda grass did not show significant differences between mean Kc values for intercropped (1.02) and single cropped (1.00).

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“…Lysimeters are used to measure crop evapotranspiration by taking account of the crop's transpiration and soil surface evaporation. Potential evapotranspiration (Ep) is a measure of the atmosphere's ability to evaporate and transpire water from the surface [20,20,48,67,68,69]. It can be estimated via indirect methods, using empirical models such as the modified Penman Monteith FAO 56 method, Penman 1945 method, Blaney Criddle method, Hargreaves methods, Priestley-Taylor methods, and Thornthwaite method [45].…”

Section: Introductionmentioning

confidence: 99%

Effects of plant spacing on evapotranspiration for estimating crop coefficient of Japonica rice

Ukpoju,

Yuliawan,

Ichwan

et al. 2023

E3S Web of Conf.

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A field experiment was conducted to evaluate the evapotranspiration (ET), crop coefficient (Kc), and water use efficiency (WUE) of rice in two unique transplanting systems: Jejer Manten (JM) and Jajar Legowo (JL) under irrigated conditions. Research studies in Indonesia attribute JM and JL with high yields and water productivity compared to the conventional tile (TL) system using Indica rice. There is no scientific research on the effect of JM and JL on ET for estimating Kc in both Indica and Japonica rice. The aim of the study is to evaluate the influence of JM, JL, and TL on ET, Kc, and WUE of Japonica rice at different rice growth stages. Crop ET and water surface evaporation beneath the rice canopy (Ew) were measured by lysimeters installed in each transplanting system. The average of Kc was calculated at the vegetative, reproductive, and ripening stages. The yield was higher in JM and JL compared to TL. In terms of water conservation and efficiency, JL outperforms JM and TL due to lower ET, Kc values, and higher WUE. Selecting an appropriate transplanting system is subject to local conditions and water availability .

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Estimation method of grass net radiation on the determination of potential evapotranspiration

Cited by 10 publications

References 24 publications

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Quantification and Prediction of Nighttime Evapotranspiration for Two Distinct Grassland Ecosystems

Crop coefficients of tropical forage crops, single cropped and overseeded with black oat and ryegrass

Effects of plant spacing on evapotranspiration for estimating crop coefficient of Japonica rice

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