A tractor-assisted multi-row harvester for root vegetables includes adjacent pairs of a lifting share and a picker and a pair of traction assemblies, for example in the form of endless track assemblies, one of which being behind and registered with at least one of the adjacent pairs of a lifting share and picker and being motorized and energized so as to compensate at least partially for pressure on the lifting shares. The harvester includes sensors on the motorized traction assembly and/or on the lifting shares that generates signal(s) indicative of the pressure on the lifting shares and that is used to control the motorized traction assembly to compensate for the pressure.

Apparatus and method for harvesting biomass from a dead zone in a body of water includes structure and/or function whereby, preferably, at least one guide float is configured to float below the water surface. At least one support structure is configured to be coupled to the bottom beneath water, and is configured to support a substantially rigid frame within the dead zone. A main funnel is coupled to (i) the at least one guide float and (ii) the substantially rigid frame within the dead zone, and is configured to collect descending biomass and funnel it toward a lower funnel that is coupled to the bottom of the main funnel. A collection canister is disposed adjacent the lower funnel and is configured to store the descending biomass. Hauling structure is coupled to the guide float and is configured to haul the collection canister from the lower funnel to the surface.