With no information, any recommendation would just be a guess. Without a soil test and some results you could start with a bit of background. What is the basic soil type? Rough pH, How much organic matter in the soil? How vigorous did they grow last year? Are the leaves nice and green and lush or small and yellowing? How much rainfall do you get?
If the vines are growing well and show no yellowing, they may not need any fertilizer. Marquette is pretty vigorous and you don't want to over fertilize.