"Who has specific information on Potassium Sulphate and its use?" The use of potassium sulphate has been discussed previously not many months ago in this same forum. It is suprising that it has been brought forward as something new but it has been used for long by holders of bulb collections. Ian Wilson is who has been recommending its use of late but Patrick M. Synge, Harry Hay, Brian Mathew are only a few of those who use or used it. I have used it for over three decades with great results. As for granite top dressing providing nutrients to plants it could be possible...in 10,000 years. It is often mentioned that potassium is present in granite and that it should accordingly be of benefit to certain plants. But granite is insoluble: it would take eons for root plants to extract them from rocks. Reduced to a powder the surface to be attacked by acids to make them soluble would increase but yet it is unlikely that part of it would dissolve within useful periods. Regards Alberto _________________________________________________________________ Charla con tus amigos en línea mediante MSN Messenger: http://messenger.latam.msn.com/