An algebraic pedotransfer function to calculate standardized in situ determined field capacity.

OTTONI FILHO, T. B.; LEAL, I. F.; MACEDO, J. R. de; REIS, B. C. B.

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Campo DC	Valor	Idioma
dc.contributor.author	OTTONI FILHO, T. B.	pt_BR
dc.contributor.author	LEAL, I. F.	pt_BR
dc.contributor.author	MACEDO, J. R. de	pt_BR
dc.contributor.author	REIS, B. C. B.	pt_BR
dc.date.accessioned	2016-08-25T11:11:11Z	pt_BR
dc.date.available	2016-08-25T11:11:11Z	pt_BR
dc.date.created	2016-08-25	pt_BR
dc.date.issued	2016	pt_BR
dc.identifier.citation	Journal of Agricultural Science, v. 8, n. 8, p. 158-170, 2016.	pt_BR
dc.identifier.uri	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1051668	pt_BR
dc.description	Despite the large applicability of the field capacity (FC) concept in hydrology and engineering, it presents various ambiguities and inconsistencies due to a lack of methodological procedure standardization. Experimental field and laboratory protocols taken from the literature were used in this study to determine the value of FC for different depths in 29 soil profiles, totaling 209 soil samples. The volumetric water content (θ) values were also determined at three suction values (6 kPa, 10 kPa, 33 kPa), along with bulk density (BD), texture (T) and organic matter content (OM). The protocols were devised based on the water processes involved in the FC concept aiming at minimizing hydraulic inconsistencies and procedural difficulty while maintaining the practical meaning of the concept. A high correlation between FC and θ(6 kPa) allowed the development of a pedotransfer function (Equation 3) quadratic for θ(6 kPa), resulting in an accurate and nearly bias-free calculation of FC for the four database geographic areas, with a global root mean squared residue (RMSR) of 0.026 m3·m-3. At the individual soil profile scale, the maximum RMSR was only 0.040 m3·m-3. The BD, T and OM data were generally of a low predicting quality regarding FC when not accompanied by the moisture variables. As all the FC values were obtained by the same experimental protocol and as the predicting quality of Equation 3 was clearly better than that of the classical method, which considers FC equal to θ(6), θ(10) or θ(33), we recommend using Equation 3 rather than the classical method, as well as the protocol presented here, to determine in-situ FC.	pt_BR
dc.language.iso	eng	eng
dc.rights	openAccess	eng
dc.subject	Capacidade de campo	pt_BR
dc.subject	Drenagem interna	pt_BR
dc.subject	Funções de pedotransferência	pt_BR
dc.title	An algebraic pedotransfer function to calculate standardized in situ determined field capacity.	pt_BR
dc.type	Artigo de periódico	pt_BR
dc.date.updated	2016-08-25T11:11:11Z	pt_BR
riaa.ainfo.id	1051668	pt_BR
riaa.ainfo.lastupdate	2020-09-02 -03:00:00	pt_BR
dc.identifier.doi	10.5539/jas.v8n8p158	pt_BR
dc.contributor.institution	THEOPHILO B. OTTONI FILHO, UFRJ; ISAIAS F. LEAL, UFRJ; JOSE RONALDO DE MACEDO, CNPS; BRUNO C. B. REIS, UFRJ.	pt_BR
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