[member=211507]mklanch[/member] I suggest you dig a few holes around the field to find out why it's spongy. Is it a build up of moss, is it very wet and undrained? You need to know what's under there before you try to put any grazers on. Of course it also needs to be securely fenced and checked for toxic plants.
What do you do on the rest of your smallholding and what are your hopes to do with this new piece?
I often suggest that a new landowner waits for a year to see just what the land is like through the seasons. There's no point intending to grow veg crops for sale as a green box scheme, for example, if the ground is waterlogged all year, or is very heavy clay. In a year you will learn where the cold spots are, which bits are too shaded, where the wind whistles through, if there are any poisonous plants and so much more. I appreciate that a year is a long time when you're raring to get started, but at least don't make any unchangeable decisions until you know what's what.