What is Delta T?
Delta T is one of the main indicators for assessing spray conditions. It’s especially used in Summer as higher temperatures and low relative humidity limit spraying time.
Why is Delta T important?
Delta T helps growers to understand if the temperature and humidity balance will allow for effective absorption of the sprays applied to crops with minimal spray drift.
Delta T helps growers to understand if the temperature and humidity balance will allow for effective absorption of the sprays applied to crops with minimal spray drift.
- When Delta T is too high, spray droplets may dry up before they have the chance to be effective.
- When Delta T is very low, the spray droplets can remain on the plants for a long time, increasing the likelihood of them being washed off by rain or being subject to spray drift.
This chart relates relative humidity and air temperature to Delta T.
How do we measure and summarise Delta T?
The Delta T calculation is based on temperature and relative humidity and is outlined below.
Delta T in °C = TEMPERATURE - ( TEMPERATURE *(ATAN(0.151977*POWER(HUMIDITY +8.313659,0.5))) + ATAN(TEMPERATURE +HUMIDITY)-ATAN(HUMIDITY -1.676331) + 0.00391838 * POWER(HUMIDITY,1.5)*ATAN(0.023101 * HUMIDITY ) - 4.686035 )
Delta T can be calculated with data from:
The Delta T calculation is based on temperature and relative humidity and is outlined below.
Delta T in °C = TEMPERATURE - ( TEMPERATURE *(ATAN(0.151977*POWER(HUMIDITY +8.313659,0.5))) + ATAN(TEMPERATURE +HUMIDITY)-ATAN(HUMIDITY -1.676331) + 0.00391838 * POWER(HUMIDITY,1.5)*ATAN(0.023101 * HUMIDITY ) - 4.686035 )
Delta T can be calculated with data from:
- Any microclimate sensing solution (MCSS) location with a Meter Atmos 14 or Decagon VP4 sensor attached, or
- Any gridded location.
What does this mean for users?
Delta T data provides further insight into making effective spray decisions.
Can I set up notifications for Delta T?
This is likely to be available in a future release.
Will I be able to view Delta T in the web portal?
This is likely to be available in a future release.
What does it mean when the Delta T value has an asterisk next to it?
If an asterisk is displayed against a Delta T value, then this indicates that the timeline is showing predicted data. A Delta T value with no asterisk is based on observed data.
Tap on the Delta T value to view a chart of all observed and predicted values for Delta T for the current day when making decisions on when to start and stop spraying.
Delta T data provides further insight into making effective spray decisions.
Can I set up notifications for Delta T?
This is likely to be available in a future release.
Will I be able to view Delta T in the web portal?
This is likely to be available in a future release.
What does it mean when the Delta T value has an asterisk next to it?
If an asterisk is displayed against a Delta T value, then this indicates that the timeline is showing predicted data. A Delta T value with no asterisk is based on observed data.
Tap on the Delta T value to view a chart of all observed and predicted values for Delta T for the current day when making decisions on when to start and stop spraying.
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