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美国生产干草的面积每年均在3450万英亩以上,各州都有相当大的面积用于干草的生产,其中主要在得克萨斯、密苏里、肯塔基、纽约、内布拉斯加和威斯康星几个州。尽管这些干草的绝大部分直接作为牧场的饲草而利用,但其价值仍不低于28.5亿美元。在一般情况下,干草是被收割、干燥而贮存作为牲畜备用饲草的各种植物地上部分的总称。当然,这是一个不够规范的名词。豆科植物能够生产出营养价值最高的干草,豆科和禾本科植物的混播则可以提供稳定,高产和优质的饲草。对劳动力的需求和气候条件的不稳定干草的收获必须高效和快速。收割、干燥和贮存的过程应当在一定的时间内完成,因为这样既可以减少收获中所投入的劳动力和机械
The United States produces more than 34.5 million acres of hay each year, and each of the states has a significant area for hay production, mainly in Texas, Missouri, Kentucky, New York, Nebraska and Wisconsin. Although the vast majority of these hay are used as forage grazing directly, they are valued at not less than $ 2.85 billion. In general, hay is the generic term for the aerial parts of various plants harvested, dried and stored as spare forage for livestock. Of course, this is not a norm. Legumes produce the hay with the highest nutritional value, while the mix of leguminous and grassy grasses provides stable, high-yielding and high-quality forage. The demand for labor and the unstable climate The harvest of hay must be efficient and rapid. The process of harvesting, drying and storing should be completed within a certain period of time as this will both reduce the amount of labor and machinery involved in harvesting