Posted: 28/06/2015 at 20:57
If you use a crop rotation plan then you'd be best planting brassica's which follow spuds. Idea spot for winter vegs - broccoli, kale, swede,, you may still get a crop with kohl rabi and radish are quick to grow.
I sow in modules rather than take my chances with sulgs eating the seedlings, seeds sown in the ground though will germinate at this time of year. .
Don't put manure in the ground for brassica's, you will be planting up to soon for it to have been taken into the soil. Someone else maybe able to answer your Q about mixing some fertilizer into the soil first, I prefer to water on a home made fertilizer each week.