watermelons black tip

Question

i have water melon plants that are starting to turn black on the tipof fruit

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Answer 1

This is called Blossom End Rot.

Here is more information and how to treat.

https://www.gardeningknowhow.com/edible/fruits/watermelon/blossom-rot-in-watermelons.htm
https://www.gardeningknowhow.com/edible/fruits/melons/melon-blossom-end-rot.htm