Abstract
Cereal grain cover crops increase surface cover, anchor corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] residues, increase infiltration, reduce both rill and interrill erosion, scavenge excess nutrients from the soil, and are easily obtained and inexpensive compared to other cover crop options. The use of cereal grain cover crops in fields where manure application occurs should increase nitrogen (N) recovery and cycling for use in subsequent crops. The objectives of this study were to determine if a rye (Secale cereale L.) cover crop increases N retention after soil application of swine lagoon slurry. Experiments were conducted in a controlled environment chamber using plastic buckets as the experimental units. Three manure-N loading rates (no manure, low, high) were applied to soils with and without a rye cover crop. A partial N balance was determined from measurements of NO3 leaching, N2O and NH3 emissions, cover crop N uptake, and NO3 + NH4 remaining in the soil. Cumulative nitrate load in the drainage water was less than 0.31 g m−2 NO3-N for rye treatments regardless of the manure rate, however in the fallow treatments, at the high manure rate NO3 leaching losses were 6.28 and 3.77 g m−2 NO3-N, for experiments 1 and 2, respectively. Rye N uptake ranged from 2.95 g N m−2 to 10.7 g N m−2, and was related to manure rate. Rye had lower cumulative N2O emission than the no rye treatment for the high manure treatment. Ammonia emissions were low for all treatments during both experiments, which was probably related to the rapid manure incorporation after application. Rye can increase N retention, reduce cumulative N2O emissions, and reduce cumulative N load in drainage water when manure is applied to soils. Nitrogen balance calculations in the cover crop treatments accounted for less than the equivalent of 50% of the added manure N. We speculate that the living rye plants may have increased immobilization of N in the organic N pools.
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Mention of trade names or proprietary products does not indicate endorsement by USDA and does not imply its approval to the exclusion of other products that may be suitable.
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Acknowledgements
The authors wish to thank Otis Smith, Ben Knutson, Jim Seevers, and Keith Kohler for technical assistance, and Brian Kerr for supplying the liquid swine manure. Partial funding for this work was provided by the Iowa Pork Producers Association.
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Parkin, T.B., Kaspar, T.C. & Singer, J.W. Cover crop effects on the fate of N following soil application of swine manure. Plant Soil 289, 141–152 (2006). https://doi.org/10.1007/s11104-006-9114-3
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DOI: https://doi.org/10.1007/s11104-006-9114-3