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METHODOLOGY AND EMPIRICAL ESTIMATES OF THE RESPONSE FUNCTION OF SORGHUM TO IRRIGATION AND SOIL MOISTURE 1
Author(s) -
Bielorai H.,
Yaron D.
Publication year - 1978
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1978.tb05592.x
Subject(s) - sorghum , irrigation , water content , soil science , environmental science , tracing , state variable , moisture , function (biology) , pedotransfer function , mathematics , agricultural engineering , hydrology (agriculture) , soil water , agronomy , computer science , geology , geography , geotechnical engineering , engineering , meteorology , physics , thermodynamics , hydraulic conductivity , evolutionary biology , biology , operating system
This paper presents a methodology for the estimation of response functions of crops to irrigation and soil moisture. A system analysis framework is applied to describe the relationships involved. Two subsystems are distinguished, with the first one involving the relationship between irrigation decision variables and soil state variables, and the second involving the relationship between soil state variables and crop yield. A method for tracing and predicting soil moisture profile variations over time and depth is presented, and empirical estimates of the response function of grain sorghum to soil moisture are derived. In the specification of the response function the concept of “critical days” is applied with a “critical day” being defined as one where the soil moisture is depleted below a certain critical level. The paper provides empirical evidence for the usefulness of the approach