Effects of agronomic management and climate on leaf phenolic profiles, disease severity, and grain yield in organic and conventional wheat production systems
Rempelos, Leonidas and Almuayrifi, Abujawad M. and Baranski, Marcin and Tetard-Jones, Catherine and Eyre, Mick and Shotton, Peter and Çakmak, İsmail and Öztürk, Levent and Cooper, Julia and Volakakis, Nikolaos and Schmidt, Christoph and Sufar, Enas and Wang, Juan and Wilkinson, Andrew and Rosa, Eduardo A. S. and Zhao, Bingqiang and Rose, Terry J. and Leifert, Carlo and Bilsborrow, Paul (2018) Effects of agronomic management and climate on leaf phenolic profiles, disease severity, and grain yield in organic and conventional wheat production systems. Journal of Agricultural and Food Chemistry, 66 (40). pp. 10369-10379. ISSN 0021-8561 (Print) 1520-5118 (Online)
Official URL: http://dx.doi.org/10.1021/acs.jafc.8b02626
Agricultural intensification over the last 40 years has increased cereal yields, but there is very limited information on the effects of intensification practices (e.g., nondiverse rotations, mineral NPK fertilizer, and pesticides) on crop health and quality. Results from the study reported here suggest that the use of mineral NPK fertilizers reduces phenolic acid and flavonoid concentrations in leaves and increases the susceptibility of wheat to lodging and powdery mildew, when compared to composted FYM inputs. In contrast, the use of herbicides, fungicides, and growth regulators reduces lodging and foliar disease severity but had no effect on phenolic acid and flavonoid concentrations. The use of composted FYM inputs also resulted in a significant grain yield reduction and not substantially reduced the severity of opportunistic pathogens such as Septoria, which remain a major yield limiting factor unless fungicides are used and/or more Septoria resistant varieties become available.
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