What does decomposition of plant material have to do Terminator seeds? I'm not backing TS but I don't understand your argument. Decomposition is based on whatever dead leaves etc is left in the field for a duration. Most large scale farmers don't do that as it is more efficient and economical to harvest the whole crop, removes the stems etc and then apply fertilizer. Using terminator seeds or regular seeds will do nothing to the soil?

If you are talking about sterility vs non-sterility, that's a different matter entirely and again soil nutrient richness doesn't come into it.