In:
Journal of Plant Nutrition and Soil Science, Wiley, Vol. 184, No. 5 ( 2021-10), p. 520-529
Abstract:
Incorporating high organic carbon amendments (HCA) in the soil can promote microbial nitrogen (N) immobilization. HCA incorporation is thought to reduce N loss via nitrate (NO 3 − ); however, it often increases nitrous oxide (N 2 O) emissions in upland soils. Aims We aimed to investigate N 2 O emission and soil N retention in different soils after co‐application of mineral N fertilizer, HCA, and phosphorus (P) fertilizer for alleviating potential microbial P limitation. Methods We conducted a 42‐day incubation experiment with nutrient‐rich silty soil (RUS), nutrient‐rich sandy soil (RSS), and nutrient‐poor silty soil (PUS). Soils were amended with wheat straw, leonardite or sawdust, with 50 mg N kg –1 soil dry weight (dw) and additionally with 0, 140, or 250 mg P kg –1 soil dw. Results The addition of 250 mg P kg –1 significantly increased CO 2 emission by 88.6% and 19.8% in wheat straw‐amended PUS and RUS, respectively. In the nutrient‐rich soils, HCA co‐applied with P mostly did not reduce N 2 O emissions. In the sandy soil, sawdust and leonardite with 140 mg P kg –1 significantly reduced the cumulative N 2 O emissions by 76.3% and 76.8%, respectively. In the silty soils amended with wheat straw, the retention of N in the form of microbial biomass and ammonium in soil was paralleled by significantly lower NO 3 − concentrations. Conclusions We conclude that P co‐application with HCA, such as wheat straw, might improve N retention, even if N 2 O emissions did not decline. However, we also found that different soils respond very differently to combined HCA, N and P addition, which calls for further research into the underlying mechanisms.
Type of Medium:
Online Resource
ISSN:
1436-8730
,
1522-2624
DOI:
10.1002/jpln.202000416
Language:
English
Publisher:
Wiley
Publication Date:
2021
detail.hit.zdb_id:
1481142-X
detail.hit.zdb_id:
1470765-2
SSG:
12
SSG:
13
Bookmarklink