Abstract:

Accurately describing the emission characteristics of nitrous oxide (N₂O) in greenhouse cultivation can effectively support the sustainable development of greenhouse production. This article compared the effects of four nitrogen supply methods on N₂O emission characteristics in greenhouse tomato production in a solar greenhouse in Shunyi of Beijing, using none fertilization as a control. The N₂O emission was measured by static camera obscuring method. The influence characteristics of four nutrient solution supplied on N₂O emission during tomato production in greenhouse were discussed. The influence of air temperature, air relative humidity and substrate temperature on N₂O emission in greenhouse was compared and analyzed. The results showed that: (1) the N₂O emission intensity of the control group and the four nutrient solution supply experimental groups ranged from 0.18−0.33kgN₂O·t⁻¹, the emission factors (EF) was from 1.01% to 1.92%, and the nutrient solution supply of garden type (YS) had the lowest emission factors, and the N₂O emission was reduced while the yield was guaranteed. (2) Compared with air relative humidity and substrate temperature, air temperature in greenhouse had the most significant effect on N₂O emissions (P<0.01). (3) Among the four nutrient solution feeding experimental groups, Yamazaki nutrient solution treatment (SQ) had the highest soluble solids and soluble sugar content, and the tomato fruit quality performance was better, and garden nutrient solution treatment (YS) had the highest tomato yield (68.76t·ha⁻¹), which was significantly different from other experimental treatments. The results of this study can provide a reference for the selection of nutrient solution and the use of more accurate emission factors for N₂O emission accounting of tomatoes cultivated in greenhouse matrix.

Key words:

"> Solar greenhouse, Nutrient solution formula, N₂O emission, Tomato cultivation, Greenhouse gas