After testing your soil, preferably in multiple locations, you will have an earth mix that is about 75% sand and at least 10% clay and less than 35% clay, by volume.[1] The amount of cement needed will be relational to how close you are to this ideal, ranging from 3-5% to 10%.[1].
Baada ya kupima udongo wako, vizuri sehemu tofauti tofauti, utakuwa na mchanganyiko ambao una asilimia 75 mchanga na angalau asilimia 10 mfinyanzi na pungufu ya asilimia 35 mfinyanzi kwa ujazo.[1] Kiwango cha saruji kitahusiana na jinsi gani umekaribia viwango hivi, Kati ya 3-5% mpaka 10%.[1].