Total degradation

The daily total degradation of the active principle (Degtot, 0-1) as a function of temperature and rainfall is estimated as:

where DegR is the rain degradation (0-1) and DegT is the temperature degradation (0-1).

The actual dose of a fungicide in a chemical mixture at day d (Dd, 0-1) is given by

where Dtot is the initial amount in the mixture (mg l-1), C% is the fraction of the fungicide in the mixture (0-1), and Dopt is the optimal dose of the fungicide (mg l-1, i.e., the one at which the active principle has the maximum efficiency).

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