I don't think a crop takes up much fertilizer when it's dry. I've fertilized pastures well with chicken litter the last 2 years, which were dry, about like Gary describes. I sold cows, bought some back in the winter. This year we had good early rain, not great, but good, and adequate rainfall so far this summer. The grass has grown and is dark green and tall. I don't think turning the crop under wiil hurt and it might help keep fertilizer. I would do soil tests before applying fertilizer next year, you might not need as much as usual.