Fig. 2: Relationship between pollinators, flowers, soil fertility and yield across fertiliser treatments.
From: Trade-off between pollinator-wildflower diversity & grassland yields
Radar diagrams showing, per Park Grass treatment plot, mean: flower abundance, flower species richness, flower functional diversity, pollinator abundance, pollinator species richness, pollinator functional richness, DEFRA Fertility Index, soil nitrogen, and hay yield. Treatments are given in the middle of each radar diagram. Each category has been scaled against the maximum value recorded across the plots (i.e. x’ = x/max(x)). Lines represent 0.25, 0.5, 0.75, and 1. Treatments: Nil plots: zero inputs, N*1, N*2: sodium nitrate supplying 48, 96 kg N/ha and 78, 157 kg Na/ha; N1, N2, N3: ammonium sulphate supplying 48, 96, 144 kg N/ha and 55, 110, 165 kg S/ha. Plus signs (+) indicate the addition of Na (sodium sulphate at 15 kg/ha Na and 10 kg/ha S) and Mg (magnesium sulphate at 10 kg/ha Mg and 13 kg/ha S). Si denotes water soluble sodium silicate supplying 135 kg/ha Si and 63 kg/ha Na. Organic fertiliser plots received 35 t/ha farmyard manure (FYM) and pelleted poultry manure (PM) every fourth year.
