Summary
This 2024 field study evaluated combined irrigation and nitrogen fertilisation strategies in a rice-upland crop rotation system to improve rice productivity whilst reducing nitrogen losses to the environment. The authors present evidence that optimised management of both water and nitrogen inputs can simultaneously enhance grain yield and lower environmental nitrogen fluxes. The findings suggest scope for more efficient nutrient and water use in monsoon-influenced rice systems through integrated agronomic optimisation.
UK applicability
Direct applicability to UK rice production is limited, as commercial rice cultivation in the UK is marginal and climatic conditions differ substantially from the study region. However, the methodological approach to optimising nitrogen retention and water management whilst maintaining productivity may inform UK cereal and arable systems, particularly under scenarios of changing water availability.
Key measures
Rice grain yield; paddy nitrogen loss (likely encompassing leaching, runoff, and/or denitrification); nitrogen fertiliser application rates; irrigation scheduling and water management
Outcomes reported
The study measured rice productivity (yield) and nitrogen loss pathways (as suggested by leaching, denitrification, or runoff) under varied irrigation and fertiliser management regimes in a rice-upland cropping system. Outcomes included grain yield, nitrogen use efficiency, and environmental nitrogen fluxes.
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