Radiation balance of soybeans grown in Brazil

André, Romísio Geraldo Bouhid; Viswanadham, Y.

doi:10.1016/0002-1571(83)90049-3

Cited by 11 publications

(8 citation statements)

References 35 publications

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“…This factor made a cooler surface over E-W rows and resulted higher net radiation over it. It has also been suggested by Andre and Viswanadham (1983). Monteith and Szeicz (1961) suggests that net radiation is related to thermal condition of the surface which we observed in Fig.…”

Section: Diurnal Pattern Of Net Radiationsupporting

confidence: 76%

Comparisons of Solar Radiation Interception, Albedo and Net Radiation as Influenced by Row Orientatoins of Crops.

Baten

Kon

1997

J. Agric. Meteorol.

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Section: Diurnal Pattern Of Net Radiationsupporting

confidence: 76%

Comparisons of Solar Radiation Interception, Albedo and Net Radiation as Influenced by Row Orientatoins of Crops.

Baten

Kon

1997

J. Agric. Meteorol.

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“…Forest and pasture albedo follow the ABRACOS (Anglo‐Brazilian Amazonian Climate Observation Study [ Gash et al , 1996]) recommendation [ Wright et al , 1996] and several numerical experiments [ Costa and Foley , 2000; Berbet and Costa , 2003]. While one of the soybean simulations follow the observed data on the field, the other simulation aims at reproducing the peak values (0.26) observed elsewhere in the literature [ Blad and Baker , 1972 ; André and Viswanadhan , 1983; Fontana et al , 1991]. The soybean albedo observed on the field indicates an increasing albedo as the crop grows, and decreasing albedo as the crop drops leaves and dries out.…”

Section: Model Description and Soybean Parameterizationmentioning

confidence: 99%

Climate change in Amazonia caused by soybean cropland expansion, as compared to caused by pastureland expansion

Costa

Yanagi

Souza

et al. 2007

Geophysical Research Letters

143

119

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In the last two decades, the strong increase of pasturelands over former rainforest areas has raised concerns about the climate change that such change in land cover might cause. In recent years, though, expansion of soybean croplands has been increasingly important in the agricultural growth in Amazonia. In this paper we use the climate model CCM3 to investigate whether the climate change due to soybean expansion in Amazonia would be any different from the one due to pastureland expansion. The land component of the model has been updated with new findings from the Large‐Scale Biosphere Experiment in Amazonia (LBA), and a new soybean micrometeorological experiment in Amazonia. Results show that the decrease in precipitation after a soybean extension is significantly higher when compared to the change after a pastureland extension, a consequence of the very high albedo of the soybean.

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“…The net radiation quantifies the energy available for crop evapotranspiration, photosynthesis, and soil heating (Monteith and Unsworth, 1990). Several authors have related net radiation to solar radiation by means of empirical relationships (André and Viswanadham, 1983;Kowalik and Turner, 1983;Mermier and Seguin, 1976). Unfortunately, these relationships may be difficult to be generalized to all surface and atmospheric conditions.…”

Section: Net Radiationmentioning

confidence: 99%

The use of the scintillation technique for monitoring seasonal water consumption of olive orchards in a semi-arid region

Ezzahar¹,

Chehbouni

Hoedjes

et al. 2007

Agricultural Water Management

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To monitor seasonal water consumption of agricultural fields at large scale, spatially averaged surface fluxes of sensible heat (H) and latent heat (LvE) are required. The scintillation method is shown to be a promising device for obtaining the area-averaged sensible heat fluxes, on a scale of up to 10 km. These fluxes, when combined with a simple available energy model, can be used to derive area-averaged latent heat fluxes. For this purpose, a Large Aperture Scintillometer (LAS) was operated continuously for more than one year over a tall and sparse irrigated oliveyard located in south-central Marrakesh (Morocco). Due to the flood irrigation method used in the site, which induces irregular pattern of soil moisture both in space and time, the comparison between scintillometer-based estimates of daily sensible heat flux (HLAS) and those measured by the classical eddy covariance (EC) method (HEC) showed a large scatter during the irrigation events, while a good correspondence was found during homogenous conditions (dry conditions and days following the rain events). We found, that combining a simple available energy model and the LAS measurements, the latent heat can be reliably predicted at large scale in spite of the large scatter (R2 = 0.72 and RMSE = 18.25Wm2) that is obtained when comparing the LAS against the EC. This scatter is explained by different factors: the difference in terms of the source areas of the LAS and EC, the closure failure of the energy balance of the EC, and the error in available energy estimates. Additionally, the irrigation efficiency was investigated by comparing measured seasonal evapotranspiration values to those recommended by the FAO. It was found that the visual observation of the physical conditions of the plant is not sufficient to efficiently manage the irrigation, a large quantity of water is lost (37% of total irrigation). Consequently, the LAS can be considered as a potentially useful tool to monitor the water consumption in complex conditions

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Radiation balance of soybeans grown in Brazil

Cited by 11 publications

References 35 publications

Comparisons of Solar Radiation Interception, Albedo and Net Radiation as Influenced by Row Orientatoins of Crops.

Comparisons of Solar Radiation Interception, Albedo and Net Radiation as Influenced by Row Orientatoins of Crops.

Climate change in Amazonia caused by soybean cropland expansion, as compared to caused by pastureland expansion

The use of the scintillation technique for monitoring seasonal water consumption of olive orchards in a semi-arid region

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