when pertaining to watermelons what causes blossom end rott and how can it be avoided?

Answer 1

Blossom end rot usually occurs when the temperature is too hot for the delicate blossoms to mature. Too much heat and sun, too little water, in these extremes--the soil loses its calcium and affects the growth of the fruit. Next year, prepare your soil a few months before planting by adding lime to your soil. Also, wait to plant watermelons until after Spring is well underway--early June in Illinois. I've posted a link to give you further advice...

Answer 2

rotate/turn/move the melons.
Try not to water the blossoms

Answer 3

calcium deficiency. add lime http://www.ces.ncsu.edu/depts/pp/notes/oldnotes/vg19.htm