 Persistence of Red Clover (Trifolium pratense L.): Relationships between Plant Population and Forage Yield Red clover (Trifolium pratense L.) is an important forage species in temperate regions of the world; in Chile, it is a valuable resource for animal production and for the seed industry. However, the main limitation of this species worldwide is the lack of persistence related to the high mortality of plants due to a complex of multiple biotic and abiotic factors (Ortega 0000; Taylor and Quesenberry 0000). Therefore, in 0000, a red clover breeding program was started at INIA Carillanca Research Center, Chile, with the main objectives of improving the survival of plants, forage yield and persistence. Since then, two cultivars have been released to replace the old cultivar Quiñequeli-INIA: first the cultivar Redqueli-INIA and recently Superqueli-INIA. The purpose of this paper is to review the relationship between plant populations of red clover and forage yield.