期刊
BIOLOGY AND FERTILITY OF SOILS
卷 58, 期 3, 页码 355-364出版社
SPRINGER
DOI: 10.1007/s00374-022-01635-y
关键词
Plant-microbe competition; (15) N tracing; Tropical grasses; N acquisition
类别
资金
- Internal Grant Agency of Czech University of Life Sciences Prague [20213110]
- One CGIAR Initiative on Livestock, System and Climate Resilience (LCSR)
- BBSRC project grant RCUK-CIAT Newton Fund-Advancing sustainable forage-based livestock production systems in Colombia (CoForLife) [BB/S01893X/1]
- BBSRC project grant UKRI Global Challenges Research Fund (GCRF) GROW Colombia grant via the UK's BBSRC [BB/P028098/1]
Biological nitrification inhibition (BNI) is a plant strategy to increase nitrogen (N) use efficiency by reducing N losses. Recent studies have found that microbial N immobilization plays a crucial role and is more important in high-BNI genotypes in the short term. However, high-BNI genotypes did not show higher N uptake during the first three weeks after fertilization as expected.
Biological nitrification inhibition (BNI) has been considered a plant strategy to increase N use efficiency by reducing N losses via N2O emissions or nitrate leaching. However, recent studies have revealed no difference in gross nitrate production among Urochloa humidicola genotypes with previously described high- and low-BNI capacity and pointed towards a crucial role for microbial N immobilization. In the current greenhouse study, we compared the (15) N acquisition by two U. humidicola genotypes (with high- and low-BNI capacity) and their soil-associated microorganisms at four points in time after fertilization (50 kg N ha(-1)). Soil microorganisms slightly out-competed both genotypes during the first 24 h after fertilization, and microorganisms associated with high-BNI genotype immobilized more N than microbes associated with low-BNI plants. Nevertheless, by the end of the experiment, low-BNI plant genotype had acquired more (15) N, despite higher to N2O emissions. Furthermore, higher (15) N root-to-shoot transfer was observed in low-BNI plants, potentially indicating higher contribution of nitrate to plant N uptake. In conclusion, our results confirm higher importance of microbial N immobilization in high-BNI genotypes, at least in the short-term. However, this did not result in higher N uptake by the high BNI genotype during the first 3 weeks after fertilization as could be expected. Long-term field studies are required to better understand the implications of direct (BNI sensu stricto) and indirect mechanisms (including differences in rhizosphere microbial biomass, activity and composition between high- and low-BNI genotypes), processes on plant N use efficiency, N storage in soil, and N losses to the environment.
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