Corn yield, phosphorus uptake and soil quality as affected by the application of anaerobically digested dairy manure and composted chicken manure
Ramphisa, P Dimakatso | Davenport, R Joan
The excessive accumulation of animal manure in livestock production units has made manure a valuable phosphorus (P) source that if used efficiently can be a sustainable alternative to mineral P fertilizer. A two-year field experiment was conducted at Paterson, South Central Washington, to assess corn (Zea mays L.) grain yield, tissue P concentrations, soil quality indices and Olsen P test in soils amended with composted chicken manure, anaerobically digested dairy manure (AD dairy manure) and mono-ammonium phosphate (MAP). Treatments were applied using four rates. There was no significant grain yield and grain P response to fertilizer treatments. Corn leaf P concentration was significantly higher when application rate was twice (40 kg P ha⁻¹) and four times (80 kg P ha⁻¹) the recommended rate relative to the no-P control treatment. At these higher P application rates, leaf P from plots receiving composted chicken manure and AD dairy manure were comparable to leaf P concentration in the MAP treatment. Soil Olsen P test increased with application rate, although increases were not always statistically significant. Soil quality indices for both years did not differ significantly for the two-manure derived P sources vs mineral P fertilizer. These results suggest that changes in soil quality indices should not be expected change within 2 years of using manure derived P
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