Unlocking field capacity: A reliable, simple, and budget- friendly indirect approach

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41210%2F24%3A100691" target="_blank" >RIV/60460709:41210/24:100691 - isvavai.cz</a>

Alternative codes found

RIV/60460709:41210/23:96554

Result on the web

<a href="https://czuni.cz/wp-content/uploads/2023/12/6th-ISSP-Book-of-Abstracts_Final_complet_web.pdf" target="_blank" >https://czuni.cz/wp-content/uploads/2023/12/6th-ISSP-Book-of-Abstracts_Final_complet_web.pdf</a>

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Unlocking field capacity: A reliable, simple, and budget- friendly indirect approach

Original language description

Field capacity (FC) or field water capacity is defined as the maximum amount of water soil can hold against the force of gravity after excess water has drained away (Cassel and Nielsen, 1986). This study presents a cheap, fast and uncomplicated technique for indirectly determining the field capacity (FC) in soil, which is a crucial parameter for hydropedology, environmental modeling and irrigation applications, despite its often unclear definition. Relationships between FC (determined as water content at certain set matric potentials) and soil moisture constants, specifically maximum capillary water capacity (MCWC) and retention water capacity (RWC), were established using undisturbed soil core samples analyzed by pressure plate method and by "filter paper draining method” (Spasić et al., 2023). This method involves determining the gravimetric soil water content of core samples. The samples were saturated and then allowed to drain naturally on the filter paper for a specified time interval (max. 24 hours). This method has long history of use in the Czech Republic as an approximate of FC, but it has never been correlated with a soil water content determined at a specific matric potential. The objective was to lower the time and expenses linked to conventional FC measurement techniques, and to enable the utilization of legacy databases comprising MCWC and RWC figures. The outcomes exposed the significant possibility of the "filter paper draining method" as an encouraging strategy for indirect FC determination, tested on more than 700 samples. FC as soil water content at -33 kPa can be well approximated by the equation FC33 = 1.0802 RWC - 0.0688 (with RMSE = 0.045 cm3/cm3 and R = 0.953). For FC as soil water content at - 5 or -10 kPa, either of the following equations can be used: FC5 = 1.0146 MCWC - 0.0163 (with RMSE = 0.027 cm3/cm3 and R = 0.961) or FC10 = 1.0152 MCWC - 0.0275 (with RMSE = 0.033 cm3/cm3 and R = 0.958), respectively. Historical pedotransfer functions by Brežný and Váša (Drbal, 1971) relating FC to fine particle size fraction were also evaluated for practical application, and according to the results, they cannot be recommended for general use.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

40104 - Soil science

Project

<a href="/en/project/QK1910299" target="_blank" >QK1910299: Sustainable management of natural resources with emphasis on non-production and production ability of soil</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů