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. 2016 Feb 5;6:20700. doi: 10.1038/srep20700

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Seasonal dynamics of soil and air temperature (a), soil moisture (WFPS, b), and soil ammonium (NH₄⁺-N, c) and nitrate (NO₃⁻-N, d) in greenhouse vegetable cropping systems over the 2013–2014 annual cycle. Arrows represent basal fertilization and topdressing events. F_−L, F_−M and F_−H refer to N fertilizer treatments at the low, medium and high application rates, respectively.