Claim · model-written summary
The magnitude and direction of the soil N flux were greatly and negatively affected by plant-absorbed N during the flooding period.
Oryza sativaVerbatim
e1“The magnitude and direction of the soil N flux were greatly and negatively affected by plant-absorbed N during the flooding period”
e3“rice-cultivation lysimeter experiment”
Title
Effects of Silicon Application on Nitrogen Migration in Soil–Rice Systems under Cadmium Stress
Xiao Tan; Jingjing Gao; Longguo Li; et al. Sustainability 2023. doi:10.3390/su152416552
Other claims from this paper (11)
- Intervention effect Cd stress reduced rice plant dry weight by 26.0~83.4% compared with the Cd- and Si-free control (CK).
- Intervention effect Cd stress reduced the nitrogen concentration in rice plants by 15.7~46.6% compared with the control (CK).
- Intervention effect Cd increased nitrogen leaching from soils in the rice system, with nitrate-N rather than ammonium-N being leached out.
- Intervention effect Silicon application significantly alleviated the adverse effects of Cd on rice plant growth and soil nitrogen loss.
- Intervention effect Silicon application reduced acid-extractable Cd in the soil from 1.07 to about 0 mg kg-1.
- Intervention effect Silicon application decreased the Cd content of rice plants by 59.1~96.4%.
- Intervention effect Silicon application decreased the Cd translocation index in rice plants from 17.7% to 2.2%.
- Intervention effect Silicon application increased nitrogen absorption by rice plants from 1.35 to 2.75~3.5 g.
- Observation In the nitrogen mass balance, plant-absorbed N contributed predominantly (43.9~55.6%) to the variation in soil total N compared with soil N flux.
- Association There is a significant trade-off between plant-absorbed N and soil N flux.
- Mechanism The authors conclude that Si application reduced N leaching in soil-rice systems under Cd stress mainly through promoted plant N absorption rather than N immobilization in soils.