Effects of potassium application on nutrient absorption dynamics,biomass and quality formation of forage maize Effects of Nitrogen Application on Forage Maize Planted in Two Soil Types in Agriculture-Animal Husbandry Ecotone of North China Growth Dynamics and Optimum Harvest Period of a Novel Forage Maize Effects of different nitrogen additions on the yield, quality and nutrient absorption of forage maize Synchrony of Double-ear Development of Forage Maize in Cold Upland Effects of Additives on the Fermentation Quality of Mixed Silage of Forage Maize and Hullessbarley Straw in Tibet Plant Regeneration from the Protoplast Culture of Multitiller and Multispike Forage Maize and Seeding of the Regenerated Plant