A genetic "off switch" that shuts down the process in which legume plants convert atmospheric nitrogen into nutrients has been identified for the first time by a team of international scientists.

Legumes improve nitrogen fixation and soil fertility after drought. Poor soil fertility reduces the growth of desired plants and gives weeds an opportunity to gain a foothold in pastures.

This is because the seedlings lack vigor and, therefore, do not compete against a companion crop, weeds or grasses as well as other forage legumes. However, good stands can be obtained by using all of ...