EN - Adjust irrigation drip cycle size on cloudy day compared to sunny day

EN - Adjust irrigation drip cycle size on cloudy day compared to sunny day

                                                                                                                                                        
Question
Do you recognize this? You want to reduce the watering on a dark (cloudy) day, if it follows a (very) sunny day.
The reverse is also true. The watering per drip may increase on sunny days.
How do I get this right?


 Answer 

By comparing the radiation expected today - according to Meteoscope - with the amount of radiation that was recorded yesterday
was recorded yesterday.

If more radiation is expected today, then the irrigation may be increased from, for example, 2.5 cc/Joule to 3.0 cc/Joule.
If less radiation is expected, then the irrigation should be limited to, for example, 2.0 cc/Joule.

In addition to the common programs, you will need: Meteoscope (and subscription) and a custom alarm (calculate - VIP).
First we program the custom alarm, and then we assign influences to the size of the irrigation.


Custom alarm
The custom alarm is used to express the relationship between two consecutive days.
The relationship relates to the (today) expected radiation sum and the (yesterday) measured and recorded radiation sum.
This is expressed as a numerical value. This value is negative if less radiation is expected today than yesterday,
and vice versa.






















ViP Influence - irrigation  drip cycle size (phase 2)

The outcome of the custom alarm can be selected to influence the size of the irrigation.

A negative numerical value (cloudy) reduces the irrigation by a maximum of 0.5 cc,
and a positive number value increases the irrigation by a maximum of 0.5 cc.

Additinal application
With the difference expected radiation sum (Meteoscope) minus radiation sum yesterday, the dehydration of the substrate can also be controlled.
When the difference is larger than 250 Joules, for instance on a cloudy day, the irrigation can be stopped earlier in the afternoon
by a temporary extreme increase of the radiation sum start.

The dehydration can also be controlled by comparing the expected radiation sum with the radiation sum that has already been realized, till now.
For example, when only 250 Joules is expected, watering stops due to a temporary extreme increase in radiation sum start.





    • Related Articles

    • EN - How to start irrigation on higher radiation sum only first cycle

           Question The grower wants that the first irrigation cycle starts when the radiation sum reaches 120 J/cm2. The other cycles have to start when the radiation sum reaches 100 J/cm2. How to start irrigation on higher radiation sum only first cycle? ...

    • EN - iSii compact: How to set up the Irrigation Strategy

         Question How to set up the Irrigation Strategy?  Answer  The setpoints for irrigation can be found as follows: . Before the irrigation can start, valves must be connected. Hand start An irrigation cycle is started by hand as follows: Click in the ...

    • EN - How to start irrigation based on radiation sum

         Question How to start irrigation based on radiation sum  Answer  The picture below shows the recipes settings. unit phase 2 supply phase 2 supply time: ViP The supply time is 3 minutes for every cycle. EC control EC value: ViP The EC value is set ...

    • EN - How to start irrigation based on time

         Question How to start irrigation based on time  Answer  The picture below shows the recipes settings. unit phase 2 supply phase 2 supply time: ViP The supply time is 3 minutes for every cycle. EC control EC value: ViP The EC value is set to 1.5 pH ...

    • EN - How to start irrigation manually

         Question How to start irrigation manually  Answer  The picture below shows the crop section settings. Choose the option "direct manual start" in the setting "start cycle" to start an irrigation cycle manually.