Estimation of field capacity from ring infiltrometer-drainage data

Revista Brasileira de Ciência do Solo

Theophilo Benedicto Ottoni Filho²  Marta Vasconcelos Ottoni¹  Muriel Batista De Oliveira¹  José Ronaldo De Macedo¹ 

[1] ,Universidade Federal do Rio de Janeiro Department of Water Resources and Environment Rio de Janeiro RJ ,Brazil

关键词: infiltration test;    internal drainage;    aeration capacity;    teste de infiltração;    drenagem interna;    capacidade de aeração;   

DOI  :  10.1590/S0100-06832014000600011

来源: SciELO

【 摘 要 】

Field capacity (FC) is a parameter widely used in applied soil science. However, its in situ method of determination may be difficult to apply, generally because of the need of large supplies of water at the test sites. Ottoni Filho et al. (2014) proposed a standardized procedure for field determination of FC and showed that such in situ FC can be estimated by a linear pedotransfer function (PTF) based on volumetric soil water content at the matric potential of -6 kPa [θ(6)] for the same soils used in the present study. The objective of this study was to use soil moisture data below a double ring infiltrometer measured 48 h after the end of the infiltration test in order to develop PTFs for standard in situ FC. We found that such ring FC data were an average of 0.03 m³ m- 3 greater than standard FC values. The linear PTF that was developed for the ring FC data based only on θ(6) was nearly as accurate as the equivalent PTF reported by Ottoni Filho et al. (2014), which was developed for the standard FC data. The root mean squared residues of FC determined from both PTFs were about 0.02 m³ m- 3. The proposed method has the advantage of estimating the soil in situ FC using the water applied in the infiltration test.

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