ISHS Acta Horticulturae 532: International Symposium on Chemical and Non-Chemical Soil and Substrate Disinfectation
FORMULATION OF A MODEL TO RELATE NEMATODE POPULATIONS WITH EXPOSURE TIMES TO A RANGE OF TEMPERATURES |
| Authors: | N. Sasanelli, N. Greco |
| Keywords: | Control, solarization, mathematical model, temperature, exposure time |
| Abstract:
To assess the efficacy of a method of control against a target pathogen, information is required on the relationship among pathogen mortality as affected by rate x exposure time. To predict the performance of soil solarization against nematodes a model linking nematode survival x temperature x exposure time is desirable. Considering that log pathogen survival x exposure time at a constant temperature relationship is linear and can be represented by the equation y = a - bx and that Brown and Melling (1971) found that during the heat sterilization the variation of bacteria population can be represented by the equation log Pi - log Po = - Δtk/2.30258 the model Pt = Po 10-Δt/(q + mt) can be used to calculate the nematode population after a heat treatment. In this equation Pt = the nematode population after Δt exposure time in hours; Po = nematode population before the heat treatment; Δt = is the exposure time, above tt (defined as the threshold exposure time x temperature below which the organisms are not killed), (tl - to); m and q are the angular coefficient and the know term, respectively of the straight line that represents the function  = f(T); T is the temperature in °C at which the nematode population was exposed.
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