NOVELTY - Additional application of carbon dioxide (CO2) air fertilizer to greenhouse involves using mixture of crop stalk and animal and poultry excrement as substrate, controlling carbon/nitrogen (C/N) ratio of substrate at 40:1, uniformly adding microbial fermentation strain (0.3% of substrate weight), placing in simple fermenting cylinder, directly fermenting in the greenhouse, and after fermenting for three weeks, removing free waste residue from the bottom of fermenting cylinder, adding new substrate and strain, and maintaining CO2 air fertilizer concentration in the greenhouse at 800 mu l/L.    USE - Method for additionally applying CO2 air fertilizer to greenhouse (claimed).    ADVANTAGE - The method not only solves the pollution from organic waste to ecological environment, but also solves the actual problems of CO2 pollution and soil deterioration in greenhouse culture; and not only solves pollution, but also makes good use of C and N resources.    DETAILED DESCRIPTION - Additional application of CO2 air fertilizer to greenhouse involves:    (A) using mixture of crop stalk and animal and poultry excrement as substrate, and controlling C/N ratio of substrate to 40:1, in which each cubic meter of greenhouse uses 0.2-0.4 kg of crop stalk and 0.3-0.6 kg of animal and poultry excrement;    (B) cutting crop stalk into 10 cm sections and repeatedly spraying water and covering with plastic film until water content of 60-70%;    (C) uniformly mixing crop stalk with water content of 60-70% and animal and poultry excrement, determining pH value and water content of substrate, and adding water, rice vinegar, or diluted sulfuric acid to regulate pH to 6.5 and water content to 70% to obtain addition ratio of regulating agent to water;    (D) laying crop stalk with water content of 60-70% in simple fermenting cylinder to a thickness of 10 cm, weighing, mixing animal and poultry excrement, regulating agent and water into diluted paste, and uniformly spraying to cover the stalks;    (E) uniformly spraying microbial fermentation strain (0.3% of substrate mass), laying 10-cm thick wet stalk and mixture of animal and poultry excrement, regulating agent and water on the strain, and repeatedly laying until the height 5 cm less than the upper port of fermenting pool;    (F) inserting thermometer into 2 meters in each barrel, observing on the second or third day after fermentation, and starting releasing CO2 air fertilizer in the greenhouse when the temperature of fermenting substrate increases to more than 50 degrees C and there is hot air from the upper part of fermenting cylinder and the height of fermenting material begins to reduce; and    (G) after fermenting for three weeks and the temperature reduces to than 30 degrees C, removing free waste residue from the bottom of fermenting cylinder, adding new wet stalk and mixture of animal and poultry excrement, regulating agent and water, and maintaining CO2 air fertilizer concentration in the greenhouse at greater than or equal to 800 mu l/L.