Fig. 7
Photosynthetic performance index (PIABS) and maximum quantum yield of photosystem II (Fv/Fm) for the 2014 (a, c) and 2015 (b, d) cotton crop grown under irrigation regimes T1-T3 and planted into either conventionally tilled beds (Con) or a heavy rye cover crop residue (Rye) at a field site near Tifton, GA. Values are means ± standard error (n = 6)