LeafSPI Computation Leaf Sheath Coefficient = Leaf Sheath DM measured at 7 DAA/whole plant DM at 7 DAA. Individual shoots (for example: 10-20) are harvested seven days after anthesis and the shoots are separated into: spikes, leaf laminas, true stem, leaf sheath. The dry weight of leaf sheath is recorded and the total dry weight calculated. The partitioning index is calculated comparing the weight of each individual part regarding the total weight of the plant. variable_of entity acronym method_of scale_of attribute