Yield and gas exchange of greenhouse tomato at different nitrogen levels under aerated irrigation.

Significant global warming increases over the last century have resulted in recent research focused on practices to reduce greenhouse gas (GHG) emissions. Agricultural management practices, such as nitrogen (N) fertilization and aerated irrigation (AI), have significantly increased crop yields by improving soil water and fertilizer availability, and have been widely adopted in recent years. However, the interactive impact of different growing seasons and management practices in the greenhouse on GHG emissions is unclear.

[Effects of aerated irrigation on CO and NO emission from protected melon soils under different nitrogen application levels].

To reveal the effects of coupling nitrogen (N) application and aerated irrigation on soil CO and NO emission, and their relationship with soil temperature and moisture, an experiment was conducted in greenhouse melon fields by using the method of static chamber/gas chromatography to determine the CO and NO emissions of different nitrogen rates under aerated irrigation. There were two irrigation factors (AI: aerated irrigation; CK: conventional irrigation) and three N levels (N: 0; N: 150 kg·hm, the traditional nitrogen application rate was 2/3; N: 225 kg·hm, traditional nitrogen application rate). The results showed that soil CO and NO emissions in AI treatment were higher than those in CK, but no significant difference was observed between the two irrigation methods.