Systems and methods are provided for growing algae and/or other microorganisms in a controlled environment while reducing or minimizing the amount of energy required for maintaining desired conditions in the growth medium. The systems can be based on a photobioreactor having a “tube-in-tube structure”, where an outer cylindrical tube contains a heat regulation fluid that surrounds one or more inner cylinders that contain microorganisms in growth media. The heat regulation fluid in the outer cylinder, as well as the outer cylinder itself, can assist with regulating the temperature of the growth media in the inner cylinder(s).

Systems and methods are provided for growing algae and/or other microorganisms in a controlled environment while reducing or minimizing the amount of energy required for maintaining desired conditions in the growth medium. The systems can be based on a photobioreactor having a “tube-in-tube structure”, where an outer cylindrical tube contains a heat regulation fluid that surrounds one or more inner cylinders that contain microorganisms in growth media. The heat regulation fluid in the outer cylinder, as well as the outer cylinder itself, can assist with regulating the temperature of the growth media in the inner cylinder(s).

The present invention relates to a method for induction of plant growth (increase in plant biomass) in a greenhouse. More specifically, the method relates to supplying NOx gas within a specific concentration range in the atmosphere of the greenhouse and maintaining the NOx concentration, thereby stimulating plant growth (including crop growth).

The present invention relates to a method for induction of plant growth (increase in plant biomass) in a greenhouse. More specifically, the method relates to supplying NOx gas within a specific concentration range in the atmosphere of the greenhouse and maintaining the NOx concentration, thereby stimulating plant growth (including crop growth).

In an air conditioning apparatus, mixed ambient gas obtained by mixing carbon dioxide with ambient gas in a mixing unit communicating with outlets is supplied to a plant substantially uniformly through the outlets installed in the vicinity of the plant, which makes transpiration of leaves of the plant uniform, and further allows air conditioning control to be performed only over the vicinity of the plant and carbon gas concentration to be managed on the vicinity of the plant.

In an air conditioning apparatus, mixed ambient gas obtained by mixing carbon dioxide with ambient gas in a mixing unit communicating with outlets is supplied to a plant substantially uniformly through the outlets installed in the vicinity of the plant, which makes transpiration of leaves of the plant uniform, and further allows air conditioning control to be performed only over the vicinity of the plant and carbon gas concentration to be managed on the vicinity of the plant.

The present disclosure discloses a method for preparing a labelled plant and a method for preparing a labelled biochar. The method for preparing a labelled plant includes the following steps: preparing a box; placing a plant that is capable of photosynthesis in the box; preparing a labelled gas in the box, the labelled gas being an isotope-labelled carbon dioxide gas; and leaving the box standing for a preset period of time, during which the plant absorbs the labelled gas to obtain a labelled plant. In the present disclosure, the carbon element in the plant is labelled during the growth of the plant, and the concentration of .sup.13CO.sub.2 in the box is controlled by controlling the concentration of Na.sub.2.sup.13CO.sub.3, where .sup.13CO.sub.2 is prepared by chemical methods, which could improve the utilization rate of .sup.13C.

The present disclosure discloses a method for preparing a labelled plant and a method for preparing a labelled biochar. The method for preparing a labelled plant includes the following steps: preparing a box; placing a plant that is capable of photosynthesis in the box; preparing a labelled gas in the box, the labelled gas being an isotope-labelled carbon dioxide gas; and leaving the box standing for a preset period of time, during which the plant absorbs the labelled gas to obtain a labelled plant. In the present disclosure, the carbon element in the plant is labelled during the growth of the plant, and the concentration of .sup.13CO.sub.2 in the box is controlled by controlling the concentration of Na.sub.2.sup.13CO.sub.3, where .sup.13CO.sub.2 is prepared by chemical methods, which could improve the utilization rate of .sup.13C.

A vessel having an opening for receiving the product and walls surrounding the vessel at all sides except the opening. The interior of the vessel is filled with a fluid having a specific gravity lower than a specific gravity of a medium surrounding the walls outside the vessel. While the vessel is oriented with the opening facing downwards, the vessel and/or product is/are conveyed to ensure that the product enters the interior through the opening.

A carbon nanotube production system is used for improving plant growth characteristics for a plant growing medium, for example soil in an agricultural field. The system includes an internal combustion engine, for example a tractor engine, which is arranged to combust a fuel mixture therein which includes a blend of fuels and additives including a carbon nanotube seeding material. The engine is operated in pyrolysis to produce exhaust emissions containing black carbon ultrafine and nano soot, for example by towing an agricultural implement across the agricultural field. At least a portion of the exhaust emissions is captured and conditioned to process the carbon soot into carbon nanotubes. The conditioned exhaust emissions and carbon nanotubes therein are then applied to the plant growing medium, for example by using the agricultural implement to incorporate the conditioned exhaust into the soil.