Thanks quiet, I have noticed various response times, based on rain events mostly. In theory it degrades at a similar pace with the growing season as a result of soil temps. So I am guessing that even though it shows up in 2 weeks it is not all gone in 2 weeks. It should continue to release N as it continues to degrade. In Texas, yours is probably used up more quickly than here. I wouldn't be surprised if there was residue in the soil next April, from what I applied last week.