About Yvonne and the Blaukorn. It is not out, just too cheap for the specialty store. It serves its purpose, the grass grows and grows and displaces the clover. It worked for us. Blaukorn is almost pure N, nitrogen. More long-term effects would be from wheat fertilizer, that is N plus P plus S and possibly some iron and magnesium, it is a bit more expensive, 25 kg about 22,- instead of 15,-, but in return it improves the soil life at the same time and lasts longer. To just get rid of clover, Blaukorn is sufficient. The problem with every mineral fertilizer is the dose, too much is bad for the groundwater and bad for the plant, it burns. The inexperienced also fertilize too unevenly, the hand should distribute the fertilizer evenly in gentle swings, not a bit here a bit there a bit here nothing,karsten