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Modeling Water and Nutrient Movement in Sandy Soils Using HYDRUS‐2D
Author(s) -
Kadyampakeni Davie M.,
Morgan Kelly T.,
NkediKizza Peter,
Schumann Arnold W.,
Jawitz James W.
Publication year - 2018
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2018.02.0056
Subject(s) - fertigation , environmental science , soil water , leaching (pedology) , irrigation , irrigation scheduling , hydrology (agriculture) , drip irrigation , nutrient , low flow irrigation systems , infiltration (hvac) , soil science , geotechnical engineering , agronomy , geology , meteorology , chemistry , physics , organic chemistry , biology
Models help to describe and predict complex processes and scenarios that are difficult to understand or measure in environmental management systems. Thus, model simulations were performed (i) to calibrate HYDRUS‐2D for water and solute movement as a possible decision support system for Candler and Immokalee fine sand using data from microsprinkler and drip irrigation methods, (ii) to validate the performance of HYDRUS‐2D using field data of microsprinkler and drip irrigation methods, and (iii) to investigate Br − , NO 3 − , and water movement using annual or seasonal weather data and variable fertigation scenarios. The model showed reasonably good agreement between measured and simulated values for soil water content ( R 2 = 0.87–1.00), Br ( R 2 = 0.63–0.96), NO 3 − –N ( R 2 = 0.66–0.98), P ( R 2 = 0.25–0.78), and K ( R 2 = 0.44–0.99) movement. The model could be successfully used for scheduling irrigation and predicting nutrient leaching for both microsprinkler and drip irrigation systems on Florida's sandy soils. Core Ideas The model showed good agreement between measured and simulated values. NO 3 and Br on Candler fine sand was leached out beyond the 60‐cm depth within <20 d. NO 3 and Br at Immokalee leached in 20 and 25 d, respectively. The model appears ideal for irrigation scheduling under microirrigation. The model is ideal for predicting nutrient leaching for on Florida's sandy soils.