alex Keenan wrote:Paulo,
Have you ever tried adding a trench of actively working warm compost in a trench next to where the seedlings are going to supply additional heat.
I have in Alaska dug compost a trench as soon as soil can be worked and buried it then planted peas right next to or on top of trench to get some additional soil temp.
alex Keenan wrote:
I am looking to build on some work done in the 90's in Alaska. They tested using carbon on snow and soil to increase the melting of snow and soil temperature.
Currently I am working with mulch to control weeds. But mulches and cover crops tend to delay soil warming by a few weeks.
I am thinking of using something like Radish as the cover this fall so I will not have heavy mulch in spring then adding course enough biochar so it will not wash off be get sucked into soil with freeze thaw cycle.
The combination of no mulch and biochar should help increase soil temperature to the point where root crop like potato can be added when soil is 42 to 45 degrees F.
I then can add a light mulch so soil can continue to heat. When soil reaches 60 degrees F I can apply heavy mulch to keep tubers cool and extend active growing season.
I would appreciate any comment on setting up a valid test for this.
I do not have any of the data from back in the 90's, I just remember that it did work.