Open AccessEstimation of precise irrigation rates taking into account the hysteresis of soil water-retention capacity
Author(s) -
Vitaly Terleev,
Aleksandr Nikonorov,
Roman Ginevsky,
Viktor Lazarev,
Alex Topaj,
Ielizaveta Dunaieva,
Antonina Terleeva
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/403/1/012239
Subject(s) - irrigation , hysteresis , environmental science , soil water , soil science , point (geometry) , pressure head , pollution , agricultural engineering , mathematics , hydrology (agriculture) , geotechnical engineering , agronomy , geology , ecology , engineering , mechanical engineering , physics , geometry , quantum mechanics , biology
A method is proposed to calculate water irrigation rates for crops that considers hysteresis in the volumetric water content ( θ )-water pressure head ( ψ ) relations, including scanning paths, by the method of point approximation. Three θ(ψ) models are described and computational experiments were carried out using data from literary sources on the hydrophysical properties of soils with different textures. The error analysis of the point approximation of the main branches and the predictive calculation of the scanning branches of the hysteresis loop were carried out. The practical significance of the research lies in the possibility to calculate the precise irrigation rates for crops. The use of such standards minimizes unproductive spending of irrigation water, fertilizers, ameliorants and plant protection products, as well as prevents the pollution of natural waters with agrochemicals and reduces the risk of eutrophication of water sources.