Chicken manure is really for plants that like a high nitrogen feed such as brassicas, sweet corn, etc. Fruiting plants need more potash so use a dilute tomato feed. Strawberries do look a bit tired at this time of year but they are very hardy things, so just remove the brown leaves then remove the weeds. If the weeds are perennial such as dandelions, couch grass etc, I'd do as Snowdrop says.