alkali soil sensitivity plant_trait_ontology TO:0000003 Observed by general growth conditions in relation to standard resistant and susceptible checks. Since some soil problems are very heterogeneous in the field, several replications may be needed to obtain precise reading. Leaf is counted as discolored or dead if more than half of its area is discolored or dead. AlkS (related) Plant sensitivity to soils with alkali conditions (pH>7). alkali sensitivity (related) alkali sensitivity