Practical test: Lemken Karat 9/400 KU cultivator Lemken debuted its Karat mounted cultivator at Agritechnica 2007. Designed to replace the existing Thorit range, the first production Karat models reached the market in 2009, which was when we had the chance to really put a 4.0m model through its paces. So how well does the Karat perform?