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一、概况一些畜牧业发达国家草地改良面积越来越大,并作为衡量草原畜牧业生产水平高低的主要标志之一。如丹麦畜牧业产值占农业总产值的90％,种植的饲草饲料地占耕地面积的31％;日本北海道饲草饲料地占耕地面积的53％,荷兰利用2/3的土地种植饲草饲料,美国的改良草地达3.8亿亩,从70年代开始每年收割的干草全部来自栽培牧草,
I. Overview Some improved areas of grassland in some developed livestock husbandry areas are increasing and are one of the main indicators to measure the level of production of grassland husbandry. For example, the output value of livestock husbandry in Denmark accounts for 90% of the total output value of agriculture, and 31% of the total area of cultivated land is forage grass and fodder. Hokkaido, Japan accounts for 53% of the total area of forage grassland, and 2/3 of the Netherlands , The United States improved grassland 380000000 mus, from the 70s began harvesting hay every year from the cultivation of pasture,