Abstract

LUGO-VALENZUELA, H et al. Hydrodynamic characterization of the Green and Ampt model in a soil with organic improvers. Biotecnia [online]. 2022, vol.24, n.3, pp.15-21.  Epub June 19, 2023. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v24i3.1627.

In agriculture, water efficiency as well as supply and demand balance in crops are essentials. The lack of knowledge in the infiltration process in gravity irrigation increases in high-demand crops such as corn, sorghum and beans. Knowing the moisture retention in agricultural soils is important to satisfy the demand in agriculture. The purpose of this research was to study the hydrodynamic movement of water in eight treatments, mixed homogeneously, with organic additives and agricultural soil (clay loam), analyzing benefits in gravity irrigation (irrigation interval). Infiltration (F) was analyzed with the Green and Ampt model; direct and indirect physical properties were evaluated, such as the volumetric water content at saturation (θS) and capillary pressure against wetting (ψf), humidity tension curve, the second parameter applying the Brooks and Corey (1964) method, and hydraulic conductivity (Ks). The results are variable in relation to the control, organic improvers increased moisture retention by 30% and the irrigation interval increased by six days. The increase in moisture retention and accumulated infiltration, were obtained with organic material (T2) and organic material (T7), in corn harvest residues.

Keywords : Organic amendment; infiltration; moisture retention; mathematical modeling.

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