Question: asking about delay in flowering of grapes
Answer: suggested to spray planofix @ 1ml/ 5 litre water for 2 sprays at an interval of 15 days  and also application of water soluble fertiliser like  npk 19:19:19  @ 10g/lit of water as fertiliser is not applied .and also need to reclaim the soil with lime in case of acidic soils as grape plants prefer a optimum ph of 6.5-7.
* foliar spray of boric acid @ 1gram/litre + znso4 @ 2 gram/l x + urea @ 1 gram/litre twice before flowering and 10 days after  first spray should be done.