A local club member gave me the answer.
In Amazon, there are things to order called Prospector's Sieves. I got two with fine mesh and coarse mesh, about a foot/third of a meter diameter . They came in today.
They stack together so I put the coarse on top and fine underneath, put several large cups worth in, shook for a couple of minutes, took out all last year's roots, and had the left over soil nicely sorted out.
Very good way for the day to proceed after the game this morning.