Karela seeds not germinating in 2017

In the the 1980’s Karela, bitter gourd plants were some of the easiest plants to grow in tonca, miramar area of panaji
However it is observed that in 2016, 2017, despite planting a large number of karela seeds in miramar area, almost no seed is germinating due to factors which cannot be easily determined.
The only major change in the living conditions, is that radiation levels in goa have increased drastically in the last thirty years, as the usage of mobile phones has increased drastically
Any tips to increase the germination rate for karela seeds will be greatly appreciated