1[2]Nordestgaard A.Growth regulation autumn and spring with cycocel extra in seed production of red fescue,Poa pratensis and perennial ryegrass[J].Tidsskrift for Plantearl,1992,(96)5:469-472.
2[3]Ehlke N.The use of growth regulators in seed crops of red rescue,smooth-stalked meadougrass and perennial ryegrass[J].J Appl Seed Pord,1992,(10):37-42.