The optimum soil pH is 6.5 for Xiangchen(Citrusjunos),6.4 for citrange,6.1 for tangerine(C.reticulata),5.9 for Gou-touchen(C.aurantiurn),5.4 for Canton lemon(C.limonia) and 5.4 for tri-foliata(Poncirus trifoliata).

• 其最适pH 为:软枝香橙6.；5、枳橙6