Organic Wheat Farming Improves Grain Zinc Concentration - Fig 6 Julian Helfenstein Isabel Müller Roman Grüter Gurbir Bhullar Lokendra Mandloi Andreas Papritz Michael Siegrist Rainer Schulin Emmanuel Frossard 10.1371/journal.pone.0160729.g006 https://plos.figshare.com/articles/figure/Organic_Wheat_Farming_Improves_Grain_Zinc_Concentration_-_Fig_6/3710817 <p><b>Regressions of wheat grain Zn concentration with a) grain yield, b) available P, and c) grain protein concentration.</b> Grain protein concentration had a significant interaction with cropping system on grain Zn concentration; orange shading refers to conventional. P-values for the regressions were all < 0.001 and <i>F</i>-statistics were 17.3, 14.4, and 6.60, respectively. Dotted lines (shaded area) are 95% confidence regions of the regression curves.</p> 2016-08-18 17:36:43 grain Zn concentration grain Zn concentrations farmyard manure availability Olsen phosphate 28 mg kg Grain Zinc Concentration Zinc DTPA wheat grain samples soil silt content