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In page Hay:

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Conditioning of hay crop during cutting or soon thereafter is popular. The basic idea is that it decreases drying time, particularly in humid climates or if rain threatens to interfere with haying. Usually, rollers or flails inside a mower conditioner crimp, crack or strip the alfalfa or grass stems to increase evaporation rate.[2] Sometimes, a salt solution is sprayed over the top of the hay (generally alfalfa) that helps to dry the hay.[citation needed]