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Water‐Sensitive Periods during the Reproductive Growth Phase of Glycine max L. I. Regression Model for estimating daily leaf water potential
Author(s) -
Bruyn L. P.,
Pretorius J. P.,
Human J. J.
Publication year - 1995
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1995.tb01109.x
Subject(s) - evapotranspiration , irrigation , water potential , soil water , growing season , agronomy , water stress , water content , water use , environmental science , dns root zone , mathematics , hydrology (agriculture) , biology , soil science , ecology , geotechnical engineering , engineering
To establish the exact duration of critical periods for plant water stress during the reproductive growth stage of soybeans it is necessary to draw correlations between daily leaf water potential values and crop growth and yield. Different sets of daily leaf water potential values can be induced by different sets of irrigation applications. It is, however, imperative that water stress values are available for each day over the growing season of a large number of irrigation treatments. Since these values were not available, it was decided to calculate it by establishing a relationship between leaf water potential as determined by potential evapotranspiration and soil water content as well as soil water potential for various layers of the root zone. The most reliable regression formula was found to be: