Biology: the relationship between rice and weeds belongs to

This is a competitive relationship. That kind of grass is called barnyard grass. There are two kinds of wild grass and domestic grass. Weeds are seedlings grown from seeds that naturally fell into the ground last year. Home-grown plants are brought by seeds, germinate with rice seeds, and insert grass on the stump, which will take away the nutrition in the rice field. This kind of grass has roots, and its nutrition is absorbed by its own roots, unlike insects.