Heat units to emergence

[isuhunter]

Question - what is typical heat units to emergence on tomatoes? Corn is usually able to be rowed at 110 HU

[isuhunter]

Here are some wes seeds I planted. I'm curious to see how this will emerge.

[isuhunter]

Still no emergence as of last night...

[Gardeneer]

Originally Posted by isuhunter

Question - what is typical heat units to emergence on tomatoes? Corn is usually able to be rowed at 110 HU

I don't know what "Heat Unit" for emergence is.
Do you mean soil temperature for germinating ?
In that case there is a range. I would say 75 is good.
Most of my tomato seeds germinated after 5 days @ 75 t0 80F

Gardeneer

[isuhunter]

Heat units or growing degree days is a calculation that assumes growth rate of a organism/plant is controlled by temperature. We use this in corn and soybean production for insect hatch and plant development predictions.

HU/GDD = (High Temp - Low Temp)/2 - 50

So as you can see in my forecast posted earlier the GDD column represents the growing degree days estimate for each day.

[Gardeneer]

Originally Posted by isuhunter

Heat units or growing degree days is a calculation that assumes growth rate of a organism/plant is controlled by temperature. We use this in corn and soybean production for insect hatch and plant development predictions.

HU/GDD = (High Temp - Low Temp)/2 - 50

So as you can see in my forecast posted earlier the GDD column represents the growing degree days estimate for each day.

Thank you isu. I learned something today.
Now I wonder if any study is done on tomatoes.

Gardeneer

[isuhunter]

Emeregence was today.... Heat unit count (as I do in corn) is.... 123 HU from planting