二、工 ndex of soil alkalinty (一) Total alkalinty Total alkalinty including carbonate and bicarbonate in soil solution or irrigation water. Total alkalinty=CO3+ HCO3(cmol(+)/L) Lime reaction and lime soil二、 Index of soil alkalinty （一）Total alkalinty Total alkalinty including carbonate and bicarbonate in soil solution or irrigation water. Total alkalinty = CO3 2- + HCO3 - (cmol(+)/L) Lime reaction and lime soil: