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Incubation of Injected Liquid Beef Manure: Effect of Time and Manure Rate

Dep. of Soil Science, 1991 Upper Buford Circle, Univ. of Minnesota, Minnesota, St. Paul, MN 55108-6024
Growmark Inc., 1701 Towanda Ave., Bloomington, IL 61702
Dep. of Agronomy, 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801

^* Corresponding author.

An investigation was conducted to determine if N compounds and other chemical parameters that could cause poor corn (Zea mays L.) growth were associated with injected liquid beef manure. Liquid beef manure was injected into a Derinda silt loam soil (fine, mixed, mesic Typic Hapludalf) and incubated in two laboratory experiments. Experiment 1 consisted of two application rates, 18 and 36 mL kg^–1 soil, injected into 25 g of moist soil and incubated for 44 d. Experiment 2 consisted of five manure application rates (0,29,58, 116, and 232 mL kg^–1 soil, equivalent to 2.3, 4.6, 9.2, and 18.4 dry Mg ha^–1) layered between 50 g of soil and incubated for 4 wk Rstes simulated the range of manure concentrations in band applications of 37200 L manure ha^–1. There was a linear trend of increasing NHcN concentrations as manure application rates increased. A transitory period of lowered soil redox potential (E_h) and elevated pH occurred for 2 wk after application, especially for the highest manure rate. Nitrite-N accumulated with all rates of manure, but the accumulation was transitory with low manure rates. At 116 and 232 mL kg^–1, high levels of NO₂- N were present for 3 and 4 wk, respectively. Conditions potentially toxic to plants were generated initially by reducing conditions (as indicated by low E_h) and free NH₃, (due to high pH and high concentrations of water extractable and exchangeable NH₄-N), and subsequently, by accumulation of NO₄-N.

Received for publication August 13, 1990.

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