【摘 要】
：
在世界多数国家,玉米是分布最为广泛的青贮作物和价值较高的饲料作物之一。在许多国家,由于较早熟和需热量较低的玉米品种和杂交种的育成,及其栽培机械化的实现使玉米栽培面
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在世界多数国家,玉米是分布最为广泛的青贮作物和价值较高的饲料作物之一。在许多国家,由于较早熟和需热量较低的玉米品种和杂交种的育成,及其栽培机械化的实现使玉米栽培面积扩大。例如,1970年欧洲经互会成员国青贮与青饲玉米面积为149万公顷,到了1981
In most countries of the world, maize is one of the most widely distributed silage crops and more valuable feed crops. In many countries, maize cultivation has been expanded due to the breeding of more mature and less calorie maize varieties and hybrids and their mechanization of cultivation. For example, in 1970, the area of silage and green fodder maize in the members of the EMEA was 1.49 million hectares, and in 1981
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