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This article in JEQ

  1. Vol. 18 No. 2, p. 180-185
    Received: Aug 18, 1987

    * Corresponding author(s):
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First-Year Nutrient Availability from Injected Dairy Manure

  1. P. P. Motavalli,
  2. K. A. Kelling * and
  3. J. C. Converse
  1. D ep. of Agron., Cornell Univ., Ithaca, NY 14853;
    D ep. of Soil Sci., Univ. of Wisconsin, Madison, WI 53706.
    D ep. of Agric. Engineering, Univ. of Wisconsin, Madison, WI 53706.



Estimates of N, P, and K availability to corn (Zea mays L.) from injected dairy manure on three field sites in south central Wisconsin were made using a fertilizer equivalence approach. Nutrient uptake from treatments of a control, three rates of manure (approx. 53, 97, and 138 Mg ha−1 yr−1 on a wet basis), and three rates of broadcast fertilizer were evaluated. Crop nutrient recoveries of fertilizer N, P, and K were generally higher than crop recoveries of manure total N, P, and K. Estimates of first year N, P, and K availability showed substantial variability across rate, location, and year with standard deviations often about 50% of the mean. Ranges for N, P, or K availability were 12 to 63, 12 to 89, and 24 to 153%, respectively. These data do not identify those factors responsible for differences in nutrient availability from one site-year to another. Biological or chemical availability indices of a 1-wk anaerobic incubation at 40 °C or a 16-h autoclaving in 0.01 M CaCl2 solution were evaluated as measures of N availability and compared with field results. Correlations between measured changes in NH4-N from these indices, as well as total Kjeldahl N and inorganic N levels in the top 30 cm of soil 4 to 6 wk after treatment application, and N uptake indicated inorganic N levels to be a better index of N availability than the other indices examined. However, to determine nutrient availability on a routine basis, more reliable biological or chemical indices are necessary. A simple model may help to simulate environmental effects and the contribution of residual nutrients in the soil.

Research supported by the College of Agric. and Life Sciences, Univ. of Wisconsin-Madison and by A.O. Smith Harvestore Products, Inc.

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