Question

vasant ko rituraj kyu kaha jata hi ??

Answer 1

just as mango is the best fruit according  to taste and other parameters,vasant or spring is the best because of its good weather and other things and hence its known as the rituraj or kings of all seasons

Answer 2

springs brings new life to plants and trees after winter is gone.Many animals who hibernate  during winter wake in the springs season.Hence,it is considered superior of all seasons and it is named 'rituraj' like king of all seasons.