First new lands were brought under cultivation. Landlords sliced up pasture lands, carved up open fields, cut up forests, took over marshes. The farmers started growing turnips and clover as they discovered that these crops improved the soil and made it more fertile. Turnip was also a good fodder for the cattle. So they became part of the cropping system.
They also realised that nitrogen was important for crop growth. Turnip and clover restored the nitrogen and made the soil fertile again.
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