Abstract: Abstract: 【Objective】To counter the actual problem of forage shortage and bad quality existed in agriculture–animal husbandry ecotone of North China, the research was done in order to produce the forage that was economized water, high yield and quality through plastic-film mulching and nitrogen application on productive forage Maize; 【Method】Field experiment combining with laboratory experimental estimation and analysis; 【Result】By plastic-film mulching the maize biomass was increased by 23.8%, and simultaneity the nutritive matter capacity was improved effectively; Plastic-film mulching remodeled the maize field water consumption scheduling law, and increased the water use efficiency; nitrogen application promoted to co-improve the forage maize biomass and nutritive quality, and that the increase ratio of nutritive matter (percentage and yield) was double by biomass. Nitrogen application 200 kg·hm-2 in the field without film mulching and 300 kg·hm-2 in the field with film was the most seemly to ensure forage maize high yield and quality, and to keep the available nitrogen in the soil balance; 【Conclusion】Plastic-film mulching and nitrogen application is a effective technique that it can produce forage with high yield and quality, relieve the contradiction between animal and forage, and improve ecology recovery and economy development of the region.

Key words: Agriculture–animal husbandry ecotone of North China, Forage maize, Plastic-film mulching, Nitrogen application