Nutrient movement and removal in a switchgrass biomass-filter strip system treated with dairy manure.

Manure use on cropland has raised concern about nutrient contamination of surface and ground waters. Warm-season perennial grasses may be useful in filter strips to trap manure nutrients and as biomass feedstock for nutrient removal. We explored the use of 'Alamo' switchgrass (Panicum virgatum L.) in a biomass production-filter strip system treated with dairy manure. We measured changes in extractable P in the soil, NO3 -N in soil water, and changes in total reactive P and chemical oxygen demand (COD) of runoff water before and after a switchgrass filter strip. Five rates of dairy manure (target rates of 0, 50, 100, 150, and 200 kg N ha(-1) from solid manure in 1995; 0, 75, 150, 300, and 600 kg N ha(-1) from lagoon effluent in 1996 and 1997) were surface-applied to field plots of switchgrass (5.2 by 16.4 m) with a 5.2- by 16.4-m switchgrass filter strip below the manured area. Yield of switchgrass from the manured area increased linearly with increasing manure rate in each year. Soil water samples collected at 46 or 91 cm below the soil surface on 30 dates indicated < 3 mg L(-1) of NO3-N in all plots. Concentrations of total reactive P in surface runoff water were reduced an average of 47% for the 150 kg N rate and 76% for the 600 kg N rate in 1996 and 1997 after passing through the strip. Manure could effectively substitute for inorganic fertilizer in switchgrass biomass production with dual use of the switchgrass as a vegetative filter strip.

[1]  Kenneth P. Vogel,et al.  Energy production from forages (or American agriculture-back to the future) , 1996 .

[2]  J. W. Gilliam,et al.  Sediment and Chemical Load Reduction by Grass and Riparian Filters , 1996 .

[3]  Stephen R. Workman,et al.  Vegetated Filter Strip Removal of Cattle Manure Constituents in Runoff , 1998 .

[4]  Ronald M. Jones,et al.  Forage Yields, Nutrient Uptake, Soil Chemical Changes, and Nitrogen Volatilization from Bermudagrass Treated with Dairy Manure , 1997 .

[5]  Saied Mostaghimi,et al.  Vegetative Filter Strips for Agricultural Nonpoint Source Pollution Control , 1989 .

[6]  C. Seybold,et al.  Effectiveness of switchgrass filter strips in removing dissolved atrazine and metolachlor from runoff , 1999 .

[7]  Larry M. Hauck,et al.  Relating Agricultural Land Uses to In-Stream Stormwater Quality , 1999 .

[8]  S. B. McLaughlin,et al.  Evaluating environmental consequences of producing herbaceous crops for bioenergy. , 1995 .

[9]  J. C. Read,et al.  Switchgrass cultivars and germplasm for biomass feedstock production in Texas , 1999 .

[10]  D. E. Baker,et al.  A zero-tension sampler for the collection of soil water in macropore systems , 1993 .

[11]  M. J. Carter,et al.  Micro semi-automated analysis of surface and wastewaters for chemical oxygen demand. , 1975, Analytical chemistry.

[12]  D. R. Edwards,et al.  Drying Interval Effects on Runoff From Fescue Plots Receiving Swine Manure , 1993 .

[13]  K. Steele Animal Waste and the Land-Water Interface , 1995 .

[14]  D. D. Wolf,et al.  Switchgrass as a sustainable bioenergy crop , 1996 .

[15]  J. P. Riley,et al.  A modified single solution method for the determination of phosphate in natural waters , 1962 .

[16]  M. R. Overcash,et al.  Effect of Grass Buffer Zone Length in Reducing the Pollution from Land Application Areas , 1980 .

[17]  John M. Sweeten,et al.  Manure and Wastewater Management Systems for Open Lot Dairy Operations , 1994 .

[18]  Dwayne R. Edwards,et al.  Performance of Vegetative Filter Strips with Varying Pollutant Source and Filter Strip Lengths , 1996 .

[19]  G. R. Foster,et al.  Depositional Patterns of Sediment Trapped by Grass Hedges , 1995 .

[20]  M. Locke,et al.  NH4OAc‐EDTA‐EXTRACTABLE PHOSPHORUS AS A SOIL TEST PROCEDURE , 1990 .