Regmi, B.; Ojha, B.; Sharma, G. P.; Khanal, B. R.; Thapa, D. B. Effect of Nitrogen Levels on Growth and Yield of Popcorn Maize (Zea Mays Var. Everta) in Mid Hills, Parbat District, Nepal. Arch. Agric. Environ. Sci. 2024, 9, 459-465.