TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The agricultural waste is treated with alkane substrate such as butane, natural gas and propane.The method further involves introducing oxygen-containing gas (13) and water into the agricultural waste.Preferred Materials: The alkane substrate comprises butane as main component.The agricultural waste comprises waste of animals chosen from horses, cows, cattle, pigs, sheep, chickens, goats and/or turkeys in the form of slurry, manure and urine.The agricultural waste alternatively comprises vegetable material, leaf material, plant material, composting material and/or waste paper product.The carrier material comprises partially digested agricultural waste.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Arrangements: The apparatus further comprises an outlet line (17) in flow communication with the waste containment vessel for transporting partially digested agricultural waste from the vessel, and an injection distribution network (20) in flow communication with the outlet line for transporting partially digested agricultural waste from the outlet line to a field (19).The injection distribution network transports partially digested agricultural waste to the field intermittently/continuously.The apparatus further comprises source of oxygen-containing gas, oxygen-containing gas injector line (14) in flow communication with the source of oxygen-containing gas and waste containment vessel, source of water (15), and water injector line (16) in flow communication with the source of water and waste containment vessel.The oxygen-containing gas injector line is separate from the alkane injector line.The apparatus further comprises an alkane substrate inlet for introducing the substrate into the agricultural waste. ACTIVITY - Plant growth stimulator. Growth of sunflower plant was evaluated by processing Paver sand with butane-enriched plant growth promoting material. A control was performed similarly using Paver sand, which was not enriched with butane. After 23 days, the plant growth size of test and control were 20 cm and 17 cm, respectively. The results concluded that the material exhibited excellent plant growth promoting effect than the control.    MECHANISM OF ACTION - None given.