Calculation of non-reactive chemical distribution in surface fertigation

A simplified Lagrangian-based theory and practical computation of the longitudinal distribution of fertilizer injected into the inflow to a border strip, basin or furrow is presented as an adjunct to an existing surface-irrigation simulation model. The simplification consists primarily in the assump...

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Bibliographic Details
Published in:Agricultural water management 2006-11, Vol.86 (1), p.93-101
Main Authors: Strelkoff, Theodor S., Clemmens, Albert J., Perea-Estrada, Hugo
Format: Article
Language:English
Subjects:
Fertigation
hydrologic models
infiltration (hydrology)
Modeling
runoff
simulation models
spatial distribution
Surface irrigation
water flow
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Summary:A simplified Lagrangian-based theory and practical computation of the longitudinal distribution of fertilizer injected into the inflow to a border strip, basin or furrow is presented as an adjunct to an existing surface-irrigation simulation model. The simplification consists primarily in the assumption that the chemicals are non-reactive and move by advection of the flowing water and that no mixing, dispersion, or diffusion of the chemical takes place. In a corollary calculation, the composition of runoff, in terms of water fractions selected for fertilizer injection, is also simulated. Comparisons of calculated post-irrigation longitudinal distribution of infiltrated chemical are made with the results of a complete advection-diffusion model that had already been validated in the field for injection of fertilizer pulses into the furrow inflow.
ISSN:0378-3774
1873-2283
DOI:10.1016/j.agwat.2006.07.006