Assessment of yield gaps on global grazed‐only permanent pasture using climate binning. (1st January 2020)

• Record Type: Journal Article
• Authors: Monteiro, Leonardo A.; Allee, Andrew M.; Campbell, Eleanor E.; Lynd, Lee R.; Soares, Johnny R.; Jaiswal, Deepak; de Castro Oliveira, Julianne; dos Santos Vianna, Murilo; Morishige, Ashley E.; Figueiredo, Gleyce K. D. A.; Lamparelli, Rubens A. C.; Mueller, Nathaniel D.; Gerber, James; Cortez, Luis A. B.; Sheehan, John J.
• Is Part Of: Global change biology. Volume 26:Number 3(2020)
• Page Start: 1820
• Page End: 1832
• Publication Date: 2020-01-01
• Subjects: agriculture -- climate binning -- livestock -- pasture productivity -- sustainable intensification -- yield gap closure; Climatic changes -- Environmental aspects -- Periodicals; Troposphere -- Environmental aspects -- Periodicals; Biodiversity conservation -- Periodicals; Eutrophication -- Periodicals; 551.5
• DOI: 10.1111/gcb.14925
• Languages: English
• ISSNs: 1354-1013

Abstract

Abstract: To meet rising demands for agricultural products, existing agricultural lands must either produce more or expand in area. Yield gaps (YGs)—the difference between current and potential yield of agricultural systems—indicate the ability to increase output while holding land area constant. Here, we assess YGs in global grazed‐only permanent pasture lands using a climate binning approach. We create a snapshot of circa 2000 empirical yields for meat and milk production from cattle, sheep, and goats by sorting pastures into climate bins defined by total annual precipitation and growing degree‐days. We then estimate YGs from intra‐bin yield comparisons. We evaluate YG patterns across three FAO definitions of grazed livestock agroecosystems (arid, humid, and temperate), and groups of animal production systems that vary in animal types and animal products. For all subcategories of grazed‐only permanent pasture assessed, we find potential to increase productivity several‐fold over current levels. However, because productivity of grazed pasture systems is generally low, even large relative increases in yield translated to small absolute gains in global protein production. In our dataset, milk‐focused production systems were found to be seven times as productive as meat‐focused production systems regardless of animal type, while cattle were four times as productive as sheep and goats regardless of animal output type. Sustainable intensification of pasture is most promising for local development, where large relative increases in production can substantially increase incomes or "spare" large amounts of land for other uses. Our results motivate the need for further studies to target agroecological and economic limitations on productivity to improve YG estimates and identify sustainable pathways toward intensification. Abstract : We use climate binning to estimate current versus potential protein yield of global, grazed‐only, permanent pasture systems. We create a snapshot of empirical yields for meat and milk production from cattle, sheep, and goats and sort pastures into climate bins defined by total annual precipitation and growing degree‐days (a). Within bins, productivity is ranked from low to high, revealing large yield gaps among regions relative to the highest performing "climate peers" (b). Globally, most of these pastures show potential for several fold increases over current production levels (c), although they remain a low‐yield land use in terms of net food production.