Dennis, see Dianne’s comment above. Unbalanced soil would be our first thought, too. Was the manure “new”—aka hot, fresh, less than 1 year old? Shouldn’t be. It will “burn” baby plants (and adults, too, make no mistake about it). If that’s the case, and the plants have any sign of life, you might uproot them asap and reset them into some soilless seed mixture just long enough for them to come back strong. If they’re not salvageble, start again. From the ground up.
Dennis, see Dianne’s comment above. Unbalanced soil would be our first thought, too. Was the manure “new”—aka hot, fresh, less than 1 year old? Shouldn’t be. It will “burn” baby plants (and adults, too, make no mistake about it). If that’s the case, and the plants have any sign of life, you might uproot them asap and reset them into some soilless seed mixture just long enough for them to come back strong. If they’re not salvageble, start again. From the ground up.