With the early heat we are having a lot of posts are about shading. Here is my cheap response to it that I have over my field pumpkins. It's basically 1/2" pvc, 4 connectors, shade cloth & some clips from here http://www.extremepumpkinstore.com/ecom-prodshow/snapclamp12.html . this one is 3' x 3' but the ones I've made for my AG secondaries are 3' x 4' so they can cover 2 secondaries side by side at the same time.