Response of summer maize growth, water use and yield to staged deficit irrigation in the seasonally arid regions of Southwest China

Summary

This field study in Southwest China's seasonally arid regions examined how staged deficit irrigation—withholding water during less critical developmental phases whilst maintaining supply during high-demand periods—affects summer maize productivity and water use efficiency. The research addresses the agronomic challenge of sustaining yields under increasing water scarcity by testing whether strategic timing of water restriction can reduce total water input without unacceptable yield penalties. Findings contribute evidence on water management practices suited to monsoon-influenced rainfed and irrigated systems.

UK applicability

Direct applicability to the UK is limited, as the study addresses arid and seasonally monsoon-influenced conditions distinct from temperate British rainfall patterns and irrigation contexts. However, the methodological approach to deficit irrigation scheduling may have relevance to UK horticulture and arable production during projected drier summers and periods of water stress, though crop development timings and critical growth stages differ substantially.

Key measures

Maize growth dynamics, water use (irrigation and rainfall), grain yield, water use efficiency, developmental stage responses to water stress

Outcomes reported

The study measured summer maize growth parameters, water use efficiency, and grain yield under various staged deficit irrigation regimes in Southwest China's seasonally arid conditions. The research evaluated whether strategically timed water restriction during less critical growth stages could maintain acceptable yields whilst reducing total irrigation water input.

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