Prep Existing Soils In 25-30 Gal. Tubs For Next Years Tomatoes. Replacing Soil Is Not An Option. Concerned About Blights, Etc.

Question

Have used copper sulfate, Daconil, neem oil and pyrethiums during the growing season.

Answer 1

If you were treating diseases in last year's soil, it would help to solarize the soil, but that is best done when the weather is warm. The next best treatment is incorporating lots of organic material, such as compost or well aged manure into the soil. Ideally, tomato plants should be rotated in location, not planted in the same place year after year.

Here is more:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/compost-as-soil-amendment.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-garden-soil.htm

https://www.gardeningknowhow.com/garden-how-to/projects/how-to-solarize-garden-beds-to-eliminate-garden-pests-in-the-soil.htm