Improved understanding of soil water content at field capacity and estimates from pedotransfer functions
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Andabili, Samira Jaefarzade; Rasoulzadeh, Ali; Moghadam, Javad Ramezani; Pollacco, Joseph Alexander Paul; Fernández Gálvez, JesúsEditorial
Wiley
Fecha
2024-09-04Resumen
The soil water content at field capacity, θFC, is a fundamental variable for irrigation and agriculture. This study determines the optimal tension ( 33 or
10 kPa) of deriving θFC which best matches the in situ field measurements
following the Veihmeyer procedure. The Veihmeyer method refers to a profile
water status for which there is a negligible drainage rate of bare soil without
evaporation. In addition, we derive a set of linear and nonlinear pedotransfer
functions (PTFs) which estimate θFC. θFC was measured in 69 plots in northwestern Iran, which has a cold semi-arid climate. The soil properties used for
developing PTFs include texture, bulk density, and organic matter. The results
show that θFC cannot be derived at a fixed tension. We therefore developed
PTFs with satisfactory performance in reproducing in situ measured θFC. The
findings show that PTFs developed at a fixed tension consistently underestimate θFC derived in situ. It was also speculated that tension less than 10 kPa
could yield improved predictions of in situ θFC