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Statements

Subject Item
n2:RIV%2F62156489%3A43210%2F14%3A00230503%21RIV15-MSM-43210___
rdf:type
skos:Concept n18:Vysledek
rdfs:seeAlso
http://acta.mendelu.cz/62/5/1079/
dcterms:description
The yield of agricultural crops depends on water availability to a great extent. According some projections, the likelihood of stress caused by drought is increasing in future climates expected for the Central Europe. Therefore, in order to manage agro-ecosystems properly, it is necessary to know water demand of particular crops as precisely as possible. Evapotranspiration (ET) is the main part of water balance which takes the water from agro-ecosystems away. The ET consists of evaporation from the soil (E) and transpiration (T) through the stomata of plants. In this study, we investigated ET of spring barley 1-ha field (Domanínek, Czech Republic) measured by Bowen ratio/energy balance method during growing period 2013 (May 8 to July 31). Special focus was dedicated to comparison of barley ET with the reference grass ETo calculated according FAO-56 model, i.e. the determination of barley crop coefficient (Kc). This crop coefficient was subsequently separated into soil evaporation (Ke) and transpiration fraction (Kcb) by adjusting soil and phenological parameters of dual crop coefficient model to minimize the root mean square error between measured and modelled ET. . The resulting Kcb of barley was 0.98 during mid-growing period and 0.05 during initial and end periods. According to FAO-56, typical values are 1.10 and 0.15 for Kcb mid and Kcb end, respectively. The yield of agricultural crops depends on water availability to a great extent. According some projections, the likelihood of stress caused by drought is increasing in future climates expected for the Central Europe. Therefore, in order to manage agro-ecosystems properly, it is necessary to know water demand of particular crops as precisely as possible. Evapotranspiration (ET) is the main part of water balance which takes the water from agro-ecosystems away. The ET consists of evaporation from the soil (E) and transpiration (T) through the stomata of plants. In this study, we investigated ET of spring barley 1-ha field (Domanínek, Czech Republic) measured by Bowen ratio/energy balance method during growing period 2013 (May 8 to July 31). Special focus was dedicated to comparison of barley ET with the reference grass ETo calculated according FAO-56 model, i.e. the determination of barley crop coefficient (Kc). This crop coefficient was subsequently separated into soil evaporation (Ke) and transpiration fraction (Kcb) by adjusting soil and phenological parameters of dual crop coefficient model to minimize the root mean square error between measured and modelled ET. . The resulting Kcb of barley was 0.98 during mid-growing period and 0.05 during initial and end periods. According to FAO-56, typical values are 1.10 and 0.15 for Kcb mid and Kcb end, respectively.
dcterms:title
Analyses of spring barley evapotranspiration rates based on gradient measurements and dual crop coefficient model Analyses of spring barley evapotranspiration rates based on gradient measurements and dual crop coefficient model
skos:prefLabel
Analyses of spring barley evapotranspiration rates based on gradient measurements and dual crop coefficient model Analyses of spring barley evapotranspiration rates based on gradient measurements and dual crop coefficient model
skos:notation
RIV/62156489:43210/14:00230503!RIV15-MSM-43210___
n3:aktivita
n19:P
n3:aktivity
P(EE2.3.20.0248)
n3:cisloPeriodika
5
n3:dodaniDat
n4:2015
n3:domaciTvurceVysledku
n9:5972426 n9:8957924 n9:8805504
n3:druhVysledku
n20:J
n3:duvernostUdaju
n5:S
n3:entitaPredkladatele
n8:predkladatel
n3:idSjednocenehoVysledku
2580
n3:idVysledku
RIV/62156489:43210/14:00230503
n3:jazykVysledku
n14:eng
n3:klicovaSlova
Bowen ratio/energy balance method; evapotranspiration; dual crop coefficient model
n3:klicoveSlovo
n10:dual%20crop%20coefficient%20model n10:evapotranspiration n10:Bowen%20ratio%2Fenergy%20balance%20method
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[54B963D41849]
n3:nazevZdroje
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
n3:obor
n7:DG
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
4
n3:projekt
n12:EE2.3.20.0248
n3:rokUplatneniVysledku
n4:2014
n3:svazekPeriodika
62
n3:tvurceVysledku
Trnka, Miroslav Fischer, Milan Pohanková, Eva Pozníková, Gabriela
s:issn
1211-8516
s:numberOfPages
8
n17:doi
10.11118/actaun201462051079
n6:organizacniJednotka
43210