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Plants upper leaf turning yellow

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I have grown petunia & vinca,they grew very well for last 4months with lots of flower but suddenly most of the plants upper leaves turned yellow in color I hv been using 1/2 teaspoon of npk and spaying fungicide regularly once in 15 days also watering twice a day since temprature here in chennai india is max 34c min 24c but still upper leaves turned yellow can anybody help?