0-50-30
10-52-10-1%MgO
10-6-60+1MgO
20-20-20 + 3%Mgo
0-52-34
8-16-32+ 3%Mgo
15-5-45+ 3%Mgo
15+65+0
20+50+10
25-25-18 + 1Mgo
