Nonlinear allometric equation for crop response to soil salinity

Misle-Acevedo, Enrique; Kahlaoui, B.

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dc.contributor.author	Misle-Acevedo, Enrique
dc.contributor.author	Kahlaoui, B.
dc.date.accessioned	2017-10-24T19:18:59Z
dc.date.available	2017-10-24T19:18:59Z
dc.date.issued	2015
dc.identifier.uri	http://repositorio.ucm.cl/handle/ucm/895
dc.description.abstract	Crop response to soil salinity has been extensively studied, from empirical works to modelling approach, being described by different equations, first as a piecewise linear model. The equation employed can differ with actual response, causing miscalculation in practical situations, particularly at the higher extremes of the curve. The aim of this work is to propose a new equation, which allows determining the full response to salinity of plant species and to provide a verification using different experimental data sets. A new nonlinear equation is exposed supported by the allometric approach, in which the allometric exponent is salinitydependent and decreases with the increase in relative salinity. A conversion procedure of parameters of the threshold-slope model is presented; also, a simple procedure for estimating the maximum salinity (zero-yield point) when data sets are incomplete is exposed. The equation was tested in a wide range of experimental situations, using data sets from published works, as well as new measurements on seed germination. The statistical indicators of quality (R2 , absolute sum of squares and standard deviation of residuals) showed that the equation accurately fits the tested empirical results. The new equation for determining crop response to soil salinity is able to follow the response curve of any crop with remarkable accuracy and flexibility. Remarkable characteristics are: a maximum at minimum salinity, a maximum salinity point can be found (zero-yield) depending on the data sets, and a meaningful inflection point, as well as the two points at which the slope of the curve equals unity, can be found.	es_CL
dc.language.iso	en	es_CL
dc.rights	Atribución-NoComercial-SinDerivadas 3.0 Chile	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/cl/	*
dc.source	Journal of Stress Physiology & Biochemistry, 11(2), 49-63	es_CL
dc.subject	Crop modelling	es_CL
dc.subject	Salinity tolerance	es_CL
dc.subject	Allometry	es_CL
dc.subject	Crop stress	es_CL
dc.subject	Soil salinity	es_CL
dc.title	Nonlinear allometric equation for crop response to soil salinity	es_CL
dc.type	Article	es_CL
dc.ucm.facultad	Facultad de Ciencias Agrarias y Forestales	es_CL