Abstract: To understand the CO₂ emission from soil crop system as influenced by crop growth and application of fertilizer, pot and field experiments were carried out during Bima-1, Yannong-15 and Shannong-11 wheat growing seasons. Black chambers were used to take gas samples within a closed soil-crop system. Use LI-6400 type portable light and measure apparatus (USA.) to determine the soil CO₂ releasing amount in growth period of crop. the study of water stress of soil, the dry matter weight, photosynthetic rate and the above-ground biomass, the ratio between root and canopy, the high of wheat, chlorophyll cintent, the area of flag leaves. The results showed that the application of fertilizer can improve the soil of CO₂ emission. The temperture of soil and water stress of soil were main factor determining change law of release amount of CO₂ from soils and those rising and falling bring out the increase and decrease of release amount of CO₂. In certain range of nitrogen fertilizer application rates, the dry mater weight, photosynthetic rate, the high of wheat, chlorophyll content, the area of flay leaves and the abrove-ground biomass. The root affected the soil of CO₂ emission, and show significantly positive relationship.

Key words: Fertilizer application, Wheat, soil of CO₂ emission, Soil temperature, Soil water content, Biological quantity

CLC Number: 

• S161.9