Reply to Wassmann et al.: More data at high sampling intensity from medium- and intense-intermittently flooded rice farms is crucial

Kritee Kritee, Joseph Rudek, Jeremy Proville, Tapan K. Adhya, Terrance Loecke, Drishya Nair, Richie Ahuja, and Steven P. Hamburg
PNAS January 29, 2019 116 (5) 1466-1467; published ahead of print January 29, 2019 https://doi.org/10.1073/pnas.1819676116

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Here, we briefly respond to critique of our study (1) by Wassmann et al. (2). A detailed response to their letter is available online (edf.org/riceN2O).

Field Design

It is not necessary to compare intermittently flooded farms with continuously flooded farms serving as controls to understand the impacts of multiple aeration events on soil redox conditions and resulting rice-N2O. Wassmann et al. (2) define alternate wetting and drying (AWD) as a mitigation strategy, whereas we consider AWD as intermittent flooding that includes alternating dry and wet periods regardless of the cause (active drainage and/or percolation). Our study was conducted in farmers’ fields which, as stated previously (1, 3), often means that …

↵1To whom correspondence should be addressed. Email: kritee{at}edf.org.

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Reply to Wassmann et al.: More data at high sampling intensity from medium- and intense-intermittently flooded rice farms is crucial
Kritee Kritee, Joseph Rudek, Jeremy Proville, Tapan K. Adhya, Terrance Loecke, Drishya Nair, Richie Ahuja, Steven P. Hamburg
Proceedings of the National Academy of Sciences Jan 2019, 116 (5) 1466-1467; DOI: 10.1073/pnas.1819676116
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