Last fall I tilled my vegetable plot and seeded fall rye, a green manure to be dug under in the spring. We have mainly a heavy clay soil here in the Cawston area, and composting is good for breaking it up and stopping it from compacting. clay is rich in nutrients and needs to be broke up so the plants can use it. left to its own it becomes hard for roots and locks up the iron and boron. I work in organic compost every year,but I like to apply a thickly grown green manure every second year. I knock it down about April 15 with my small cultivator, let it wilt for 2 weeks and work it in again. Left for another 2 weeks (mid May) and I am ready to start digging under my rows and start planting the early crops. Peas, Potatoes, Parsnips, Carrots and the cabbage family's. I transplant plants and sow the rest of the seeds on and after the 24 of May. Leaving the beans till last by June 1st, as they need warm soil lasting through the nights.
Tilling in my fall Rye
PLANTS for GREEN Manure: Legumes ( pea and been family) as nitrogen fixers.
Alfalfa.
Clover.
Agricultural lupin.
Vetch: All nitrogen fixing plants.
Others: Such as Buckwheat, Rye, Oats, Millet, and Mustard.
All these need to be mowed or tilled under BEFORE they seed! To prevent self seeding.
Happy Cultivating! *_*