Effectiveness of agricultural water management technologies on rainfed cereals crop yield and runoff in semi-arid catchment: a meta-analysis

Sammanfattning

Multiple agricultural water management (AWM) technologies are being promoted worldwide in rainfed agro-ecological production systems, such as the Limpopo River Basin, to close the yield gap, enhance food security and reduce poverty, but evidences on yield gains and environmental impacts are varied. This paper conducts a review of the performance of AWM technologies against conventional farmer practices to produce adequate evidence on cereal yield and field runoff changes. With the interrogation of literature from 1980 to 2013 using seven AWM groupings, enough evidence was found that AWM technologies can deliver substantial benefits of increased crop yield and water productivity with reduced environmental impacts. Using random effects model, the standardized mean difference (SMD) of yield between AWM and control was 0.27, while SMD of water productivity was 0.46, indicating the effectiveness of the technologies (SMD>0). Subgroup analyses showed greatest yield responses on silty-clay-loam, clay-loam and sandy soils compared to clay and loam-sandy soils, and higher yield increase under low rainfall regime (200-500 mm) than under high rainfall regime (500-800 mm). Large yield change variations for different AWM technologies present a huge opportunity for meeting the existing yield gaps and enhancing coping capacity in dry years and under climate change.

Nyckelord

Agricultural water management; climate smart agriculture; Limpopo; rainfed; smallholder farmers; sustainable intensification; systematic review; yield gap

Publicerad i

International Journal of Agricultural Sustainability
2018, volym: 16, nummer: 4-5, sidor: 418-441
Utgivare: TAYLOR & FRANCIS LTD

SLU författare

• Barron, Jennie

  • Institutionen för mark och miljö, Sveriges lantbruksuniversitet
    
  • International Water Management Institute (IWMI)

Globala målen (SDG)

SDG2 Ingen hunger
SDG6 Rent vatten och sanitet för alla

UKÄ forskningsämne

Jordbruksvetenskap

Publikationens identifierare

• DOI: https://doi.org/10.1080/14735903.2018.1523828

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/96861