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Summary of fertilizer treatment (UF, unfertilized; CM, addition of organic chicken manure; JI, John Innes fertilizer; AN, ammonium nitrate) effects on Brassica plant size and foliar nitrogen concentration and competition between a leaf-chewing and sap-feeding phytophage. Asterisk (*) denotes no significant difference in foliar nitrogen concentration of plants growing in JI compared with the other three fertilizer treatments (all other differences are statistically significant).
