Interannual variability of wheat yield in the Argentine Pampas during the 20th century

摘要

National long-term agricultural records offer an unique opportunity to improve our understanding of the patterns of variability of crop yield. In this paper, our objectives were: (i) to describe yield and yield stability of wheat crops (Triticum aestivum L.) and (ii) to identify some controls for their spatial and temporal variability. Their environmental controls (precipitation (PPT), photothermal coefficient and drainage type) were explored using a database covering the period between 1923 and 2000 and the main subregions of the Pampas.