Abstract:

Based on the database such as CNKI and Web of science core database, the literature published from 2000 to 2024 was retrieved, and the data of spring maize yield, water use efficiency (WUE) and partial factor productivity of nitrogen (PFPN) were extracted. Based on the Meta model, the quantitative effects of furrow irrigation and drip irrigation compared to border irrigation on Water saving and yield increase of spring maize were analyzed under different field management measures in the Hetao irrigation area. The aim was to clarify the irrigation methods and supporting field management measures suitable for water−saving and yield−increasing of spring maize in the Hetao irrigation district, which would provide reference for the development of local water−saving irrigation technology and solve the problem of low water and nitrogen use efficiency in irrigation areas. Results showed that the effect of furrow irrigation and drip irrigation on water saving and yield increase for spring maize in Hetao irrigation area was better than that of border irrigation. Compared with border irrigation, the yield of spring maize increased by 12.52% and 11.62%, respectively, the WUE increased by 13.88 percentage points and 33.64 percentage points, respectively, and PFPN increased by 12.52 percentage points and 30.95 percentage points respectively under furrow irrigation and drip irrigation. Film mulching and reasonable regulation of planting density increased yield, WUE and PFPN of spring maize significantly under furrow irrigation and drip irrigation. With the increase of irrigation and nitrogen application, furrow irrigation and drip irrigation had positive effects on yield, WUE and PFPN of spring maize. The synergistic effect of water and fertilizer under drip irrigation and furrow irrigation was stronger than that under border irrigation. When the irrigation amount was less than 250mm or the nitrogen application was less than 300kg·ha⁻¹, drip irrigation had the best effect on saving water and increasing yield of spring maize, with the yield of spring maize increasing by 10.52% and 10.36%, WUE increasing by 10.41 percentage points and 10.32 percentage points , and PFPN increasing by 10.61 percentage points and 10.52 percentage points, respectively. In summary, it is recommended to use mulched drip irrigation technology for spring maize in Hetao irrigation district, with planting density not exceeding 65,000plants·ha⁻¹, irrigation amount less than 250mm, and nitrogen application less than 300kg·ha⁻¹.

Key words: Meta?analysis, Hetao irrigation district, Irrigation methods, Water use efficiency, Yield, Partial factor productivity of nitrogen