The farmer either sowed his own seed or let someone else’s seed be sown in his field. Either way, the output from the field belonged to the farmer.
That was the logic behind the Bija Kshetra nyaya, the seed-field metaphor that defined the relationship between man, woman and their heirs.
Click the link to know why knowing this rule is important for understanding the key predicament in the epic!
Also: Birth of Pandu & Dhritarshtra
Sexual freedom of women in the epic &
How Niyoga acquired a stigma
Kulture Katha 