Effects of gravel mulch on surface energy balance and soil thermal regime in an unheated plastic greenhouse
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URI: http://hdl.handle.net/10835/16264
ISSN: 1537-5110
DOI: https://doi.org/10.1016/j.biosystemseng.2020.01.010
ISSN: 1537-5110
DOI: https://doi.org/10.1016/j.biosystemseng.2020.01.010
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Bonachela Castaño, Santiago; López Hernández, Juan Carlos; Granados García, María Rosa; Magán Cañadas, Juan José; Hernández Rodríguez, Joaquín; [et al.]Fecha
2020-01-16Resumen
This work analyses how a mulch layer of mostly gravel particles affected the soil thermal dynamics in an unheated plastic greenhouse in a Mediterranean area (South-East Spain), where suboptimal regimes of soil temperature usually prevail in winter crop cycles. Soil temperature and heat flux profiles were measured in two soil types: (i) a 0.1-m thick gravel mulch (GM) placed at the top of a 0.30-m layer of imported loamy soil and (ii) the latter without gravel mulch (NM). These measurements were conducted during a winter period (14–28 January) when the dominant source of energy in the soil root-zone was the heat from deeper soil layers. The higher albedo of the GM and its higher long-wave radiation losses reduced substantially the daily net radiation at the mulch surface by ca. 77% with respect to NM. However, the soil root-zone maintained warmer under the GM than with NM in a period when soil temperatures are usually below the optimum. This was mainly caused by the insulating property ...
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Greenhouse microclimate