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18
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2.3
Special Dosage Modes
Within this topic we shall explain the
Dosage by evaporation
and
Dosage by
volume per area
.
In order to be able to use these special dosage modes, they
must be enabled through the
DEALERS DEFINITIONS
. Both of the two dosage
modes are meant to save the calculation effort when defining the amount of water to
irrigate.
Both methods are making use of the information about the area covered by each
valve, which is part of the
VALVES’ CONSTANTS
.
The table contains both the area covered by each valve and a factor in % by which
the calculated amount will be multiplied. The factor is meant to represent the special
demand of the particular crop. The area is expressed in the units selected at the
DEALERS DEFINITION
.
2.3.1
Dosage by Evaporation
When dosing by evaporation, the amount of water to be irrigated by each valve is
calculated automatically, relieving the user from the necessity of calculating and
defining the dosages per all the valves day by day.
The calculation takes into account the number of days since the last time the specific
valve was irrigated. Summing up the total evaporation during the elapsed days, data
taken from the evaporation table of the last 16 days (see the topic of
Evaporation
at the paragraph of
Irrigation/Fertigation Parameters
), the sum is then
multiplied with the area covered by the specific valve, the result we get is the total
amount of water lost by the specific area during the specified period. Finally the
result is multiplied by the factor in % that represents the specific needs of the crop.
This final result is the amount to be irrigated.
Notice that if the irrigation program is a cyclic program of "n" cycles, each cycle will
irrigate the amount of the final result divided by "n".
