Fixed and variable light extinction coefficients for estimating plant transpiration and soil evaporation under irrigated maize

Tahiri, Adel Zeggaf; Anyoji, Hisao; Yasuda, Hiroshi

doi:10.1016/j.agwat.2006.02.002

Cited by 40 publications

(23 citation statements)

References 19 publications

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“…No tratamento sem plantas, a evaporação foi mais elevada em alguns períodos, em relação ao tratamento com plantas, mesmo com menor umidade do solo no interior dos microlisímetros. Isso pode ser atribuído à maior quantidade de energia que chega na superfície do solo no tratamento sem plantas, em relação ao tratamento com plantas, no qual o dossel intercepta grande parte da radiação solar incidente (Tahiri et al, 2006;Kunz et al, 2007). As respostas observadas para evaporação acumulada da água do solo foram consistentes, tanto para períodos de medição longos, de 15 dias, quanto curtos, de 5 dias.…”

Section: Resultsunclassified

Evaporação da água na superfície do solo em sistemas de plantio direto e preparo convencional

Dalmago

Bergamaschi

Krüger

et al. 2010

Pesq. agropec. bras.

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Resumo -Este trabalho teve por objetivos quantificar a evaporação da água na superfície do solo, em plantio direto e em preparo convencional, e avaliar o uso de microlisímetros de pesagem para medir esse processo. As medições foram feitas em campo, nos verões de 2001/2002, 2002/2003 e 2004/2005, em experimentos irrigados e não irrigados. Utilizaram-se delineamentos inteiramente casualizados, com quatro repetições, cujos tratamentos consistiram de sistemas de manejo do solo -plantio direto e preparo convencional -, e a presença ou ausência de cultivo de milho. Mediu-se a evaporação diária durante períodos de secagem do solo, entre precipitações ou irrigações consecutivas. Em experimentos sem irrigação, a evaporação acumulada foi maior sob plantio direto, na maioria dos períodos de medição, independentemente da presença da lavoura de milho. Nos experimentos com irrigação, a evaporação não apresentou diferenças regulares entre sistemas de manejo de solo. Normalmente, no início dos períodos de medição, com dois a cinco dias de secagem do solo, a evaporação foi maior em solo sob preparo convencional, tendo-se tornado maior em plantio direto, no restante do período de secagem. O emprego de microlisímetros de pesagem é eficiente para medir a evaporação na superfície do solo.Termos para indexação: Zea mays, água no solo, balanço hídrico, microlisímetro, preparo do solo, semeadura direta. Soil surface water evaporation under no-tillage and conventional tillage systemsAbstract -This work aimed to quantify the evaporation of water on the soil surface under no-tillage and conventional tillage systems, and to evaluate the microlysimeters use to measure this process. Measurements were performed in the field, during the summers of

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Section: Resultsunclassified

Evaporação da água na superfície do solo em sistemas de plantio direto e preparo convencional

Dalmago

Bergamaschi

Krüger

et al. 2010

Pesq. agropec. bras.

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“…Although τ may change slightly in response to structural differences in crop development (Allen et al, 1998;Tahiri et al, 2006), it is convenient to consider τ as a constant (Allen et al, 1998;Shuttleworth and Wallace, 1985;Zhou et al, 2006). K cb,max is the basal crop coefficient at effective full ground cover.…”

Section: Transpiration and Soil Evaporation Calculation Of The Et Indmentioning

confidence: 99%

“…2a). The effective leaf area index (LAI eff ), used in the ET dir method, was equal to the actual LAI where the LAI was lower than 2 m 2 m −2 , was assumed to be half the actual LAI for actual LAI values above 4 m 2 m −2 and equal to 2 m 2 m −2 , where actual LAI values ranged between 2 to 4 m 2 m −2 (Tahiri et al, 2006).…”

Section: Crop Growth Parametersmentioning

confidence: 99%

The effect of different evapotranspiration methods on portraying soil water dynamics and ET partitioning in a semi-arid environment in Northwest China

Zeng

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. Different methods for assessing evapotranspiration (ET) can significantly affect the performance of land surface models in portraying soil water dynamics and ET partitioning. An accurate understanding of the impact a method has is crucial to determining the effectiveness of an irrigation scheme. Two ET methods are discussed: one is based on reference crop evapotranspiration (ET 0 ) theory, uses leaf area index (LAI) for partitioning into soil evaporation and transpiration, and is denoted as the ET ind method; the other is a one-step calculation of actual soil evaporation and potential transpiration by incorporating canopy minimum resistance and actual soil resistance into the Penman-Monteith model, and is denoted as the ET dir method. In this study, a soil water model, considering the coupled transfer of water, vapor, and heat in the soil, was used to investigate how different ET methods could affect the calculation of the soil water dynamics and ET partitioning in a crop field. Results indicate that for two different ET methods this model varied concerning the simulation of soil water content and crop evapotranspiration components, but the simulation of soil temperature agreed well with lysimeter observations, considering aerodynamic and surface resistance terms improved the ET dir method regarding simulating soil evaporation, especially after irrigation. Furthermore, the results of different crop growth scenarios indicate that the uncertainty in LAI played an important role in estimating the relative transpiration and evaporation fraction. The impact of maximum rooting depth and root growth rate on calculating ET components might increase in drying soil. The influence of maximum rooting depth was larger late in the growing season, while the influence of root growth rate dominated early in the growing season.

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“…Then, values of stomatal conductance (G S ) in the CC-FLD treatment relative to those of CC-noFLD treatment were evaluated before and after the flooding on October 7. The rC in the CC-FLD after the flooding was obtained by using the value of G S and stomatal resistance determined by Tahiri et al (2006), and was then used for evaluating Tr in the CC-FLD. In addition, the evapotranspiration rate (ET) was calculated in all treatments as the summation of Tr and E.…”

Section: Analyses Of Transpiration and Evaporationmentioning

confidence: 99%

“…The daily transpiration rate (Tr) and evaporation rate (E ) were analyzed using the Penman-Monteith model, while incorporating specific parameters for the corn canopy in the greenhouse (Tahiri et al 2006;Yasutake et al 2011) as:…”

Section: Analyses Of Transpiration and Evaporationmentioning

confidence: 99%

Advantages of pre-harvest temporal flooding in a catch crop field in relation to soil moisture and nutrient salt removal by root uptake

et al. 2014

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Catch crop cultivation coupled with subsequent flood activity is an environmental friendly method of removing nutrient salts from soil in greenhouse. However, in comparison with the usual fallow period in greenhouse horticulture in Japan, a longer time is required for cultivation and soil drying after flooding. To minimize such time while retaining catch crop performance, temporal flooding was conducted in an experimental catch crop field of corn before harvest (i.e., pre-harvest temporal flooding), when crops were growing well and most nutrient salts within the soil had been taken up by the roots. Results showed that pre-harvest temporal flooding enhanced crop growth and stomatal opening; hence, evapotranspiration (mostly transpiration) was increased to a high value (3.5 times that of bare soil plot in greenhouse). Therefore, compared with the bare soil field, there was a remarkable pronounced decrease in the soil water content due to evapotranspirational water loss in the catch crop field after temporal flooding. Furthermore, the total nutrient (nitrogen) uptake by crops was also significantly accelerated in relation to pre-harvest flooding owing to the increase in crop growth. It was also found that electrical conductivity and nitrate nitrogen concentration of soil solution (at a soil-water ratio of 1:5) decreased with time owing to root uptake, and were at a fairly low level when pre-harvest flooding was conducted. These results suggest that pre-harvest temporal flooding shortens the implementation time by accelerating soil drying, and increases salt removal by root uptake; thus, this method delivers considerable advantages for practical use in catch crop cultivation.

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Fixed and variable light extinction coefficients for estimating plant transpiration and soil evaporation under irrigated maize

Cited by 40 publications

References 19 publications

Evaporação da água na superfície do solo em sistemas de plantio direto e preparo convencional

Evaporação da água na superfície do solo em sistemas de plantio direto e preparo convencional

The effect of different evapotranspiration methods on portraying soil water dynamics and ET partitioning in a semi-arid environment in Northwest China

Advantages of pre-harvest temporal flooding in a catch crop field in relation to soil moisture and nutrient salt removal by root uptake

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