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Fig. 9. Apparent electrical conductivity (ECa) for subtreatments and for no winter wheat cover (–CC). Subtreatments are designated MN, manure at crop requirement nitrogen rate; CN, compost at crop requirement nitrogen rate; MP, manure at crop requirement phosphorus rate; CP, compost at crop requirement phosphorus rate; and NCK, a commercial fertilizer check. An asterisk indicates a survey date when the mean values of manure or compost and the commercial fertilizer treatment were not significantly different (P > 0.05).
