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Effect of leaf litter on the cotyledon length of the analysed species in the five treatments (C: vermiculite control; WL, washed leaf litter; UL: untreated leaf litter; 1/3: 1.33 dm3 of vermiculite and 0.66 dm3 of leaf litter; 2/3: 0.66 dm3 of vermiculite and 1.33 dm3 of leaf litter). a, b, c: same letter means no significant difference between treatments (p > 0.05).
