public void getBiomass(String manipulationId, int nodeIndex, int timestep) throws SimulationException {
long milliseconds = System.currentTimeMillis();
if(timestep >= 0)
{
ManipulationTimestepInfoRequest req = new ManipulationTimestepInfoRequest();
req.setManipulationId(manipulationId);
req.setIsNodeTimestep(true);
req.setNodeIdx(nodeIndex);
req.setTimestep(timestep);
ManipulationTimestepInfoResponse response = null;
try {
response = (ManipulationTimestepInfoResponse) svc.executeRequest(req);
} catch (RemoteException e) {