You’re on the right track. Nine times out of ten (an unofficial statistic ;-)) the failure of plants to thrive is due to unsuitable soil conditions. In this case, fertilizer is not rhe solution. The soil pH is likely too low. Radishes like neutral pH, betw 6 and 7. See more about this and how to correct it: https://www.almanac.com/content/soil-ph-levels
And the soil may be too wet, possibly too cold.
All of these circumstances lead to plant/seed failure via a fungal disease.
Before you plant anything else, you should have a soil test (why experience more failure?). See here: https://www.almanac.com/blog/gardening/garden-journal/soil-testing-better-garden
It’s possible that, this early in the season, you could correct the soil and try again. Or at least have a plan B (containers, for example).
You’re on the right track. Nine times out of ten (an unofficial statistic ;-)) the failure of plants to thrive is due to unsuitable soil conditions. In this case, fertilizer is not rhe solution. The soil pH is likely too low. Radishes like neutral pH, betw 6 and 7. See more about this and how to correct it: https://www.almanac.com/content/soil-ph-levels
And the soil may be too wet, possibly too cold.
All of these circumstances lead to plant/seed failure via a fungal disease.
Before you plant anything else, you should have a soil test (why experience more failure?). See here: https://www.almanac.com/blog/gardening/garden-journal/soil-testing-better-garden
It’s possible that, this early in the season, you could correct the soil and try again. Or at least have a plan B (containers, for example).
We hope this helps!