Response of soil N2O emission and nitrogen utilization to organic matter in the wheat and maize rotation system

Abstract

The appropriate nitrogen (N) fertilizer regulator could increase N utilization of crops and reduce N losses in the North China Plain. We investigated the effects of reduced inorganic-N rate combined with an organic fertilizer on nitrous oxide (N2O) emissions in winter wheat and summer maize rotation system. Simultaneously studied the effect of different treatments on N use efficiency (NUE), N balance and net income. After reducing the amount of nitrogen fertilizer in the wheat-corn rotation system, the results showed that the cumulative emission of soil N2O from the RN40% + HOM [40% of RN (recommended inorganic-N rate) with homemade organic matter] treatment was 41.0% lower than that of the RN treatment. In addition, the N production efficiency, agronomic efficiency, and apparent utilization were significantly increased by 50.2%, 72.4% and 19.5% than RN, respectively. The use of RN40% + HOM resulted in 22.0 and 30.1% lower soil N residual and N losses as compared with RN. After adding organic substances, soil N2O cumulative emission of RN40% + HOM treatment decreased by 20.9% than that of the HAN (zinc and humic acid urea at the same inorganic-N rate of RN) treatment. The N production efficiency, N agronomic efficiency and NUE of RN40% + HOM treatment were 36.6%, 40.9% and 15.3% higher than HAN’s. Moreover, soil residual and apparent loss N were 23.3% and 18.0% less than HAN’s. The RN40% + HOM treatment appears to be the most effective as a fertilizer control method where it reduced N fertilizer input and its loss to the environment and provided the highest grain yield.

Effects of conservation tillage strategies on soil physicochemical indicators and N2O emission under spring wheat monocropping system conditions

“…Additionally, soil N 2 O emissions are negatively correlated with soil NO 3 – N and soil pH. This is because a large amount of precipitation enters the soil during the rainy season, which increases soil moisture and converts soil NO 3 – N to NH 4 + -N, and the soil becomes a low-oxygen environment, which provides the most suitable conditions for denitrification and greatly increases N 2 O emissions 57 . Studies have shown that pH is positively correlated with N 2 O produced by the denitrification process of nitrifying bacteria, and negatively correlated with N 2 O produced by denitrification.…”

Plant Nitrogen Metabolism: Balancing Resilience to Nutritional Stress and Abiotic Challenges

“…Decreasing nitrogen fertilizer use can help control these harmful gas emissions [189]. Initially, inorganic fertilizers were promoted, but now Organic Nitrogen is recommended due to its favorable yield results and fewer harmful effects [190].…”

Identifying criteria for greenhouse gas flux estimation with automatic and manual chambers: A case study for N2O

“…Nitrous oxide (N 2 O) emissions have a global warming potential 298 times higher than carbon dioxide (over a 100‐year time frame), accounting for 6% of climate warming from human activities (IPCC, 2021), and also a strong stratospheric ozone depletion potential (Ravishankara et al, 2009). Agriculture is responsible for more than 80% of anthropogenic N 2 O emissions (IPCC, 2021), most of which are released from soils after the application of organic and inorganic fertilizers (Han et al, 2017; Shu et al, 2021). Although several groups of soil microorganisms can produce N 2 O emissions, nitrifiers, and denitrifiers are often considered the main source (Butterbach‐Bahl et al, 2013).…”