Do you have soaker hoses under that fabric? Or do you just water from above and/or rely on rain?
I do have soaker hoses along my 3 rows of trellis, but not under anything else ... they were a new addition just last year. I "furrow irrigate", which is blocking off the low end of a row and flooding it with water. Easy and the water goes directly to the roots and there is little evaporation compared with using a sprinkler in 105 degree weather.