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United States Department of Agriculture

Agricultural Research Service

Research Project: Using Agricultural and Industrial Byproducts to Improve Crop Production Systems and Environment Quality

Location: Soil Dynamics Research

2013 Annual Report

1a. Objectives (from AD-416):
There is an urgent need to develop organic waste management systems in the southeastern United States that preserve and improve the soil resources and provide for environmental quality. The objectives of this project are to: 1) develop improved management practices and/or technologies for using manures and other byproducts (e.g., FGD gypsum) to reduce nutrient loss to the environment; 2) determine and compare the impacts of poultry litter and fertilizer application practices on atmospheric emissions of greenhouse gases; and 3) in cooperation with other ARS locations, develop and evaluate new technologies (e.g., subsurface banding) for the application of poultry litter in agricultural systems.

1b. Approach (from AD-416):
Application of organic waste to soil can improve soil conditions and provide nutrients needed for plant production. Poultry litter use seems to be a viable option for producers in the Southeastern Region, especially since the bourgeoning poultry industry generates large amounts of manure, and interest in utilizing animal manure as a fertilizer source has increased due to rising costs of inorganic fertilizers. However, improper application of animal manures in agriculture can contribute to environmental degradation such as increased hypoxia, eutrophication of surface waters, human health problems, and greenhouse gas emissions. Because of this growing environmental concern, field and laboratory studies will be established to develop improved methods to utilize waste products for soil and crop benefits while minimizing environmental degradation. In addition, manure’s interaction with tillage and cropping systems is not well understood. Thus, the environmental impact of poultry litter addition to soil must be quantified, and improved management techniques for application need to be developed for sustainable use in agriculture. Studies will be initiated to determine long term effects of poultry litter on plant yields and soil physical properties under various tillage and cropping systems. Different poultry litter application practices, such as subsurface banding, will be evaluated to determine their impact on nutrient loss and greenhouse gas emissions. Soil amendments (e.g., gypsum) will be evaluated to determine the impact on plant responses and the potential to reduce phosphorus (P) loss in runoff. Information acquired in the course of this project will be useful for developing agricultural practices using poultry litter as a nutrient source for environmentally sustainable plant production.

3. Progress Report:
Because of the growing environmental concern regarding organic waste disposal, field and laboratory studies were established to develop improved methods to utilize waste products for soil and crop benefits while minimizing environmental degradation. ARS researchers at the NSDL, Auburn, AL, have initiated a series of field studies in Alabama to evaluate the impact of fertilizer and poultry litter application methods as affected by tillage systems on crop production and greenhouse trace gas losses to the atmosphere. A four-trench litter applicator implement was designed, constructed, and used for applying poultry litter in field experiments. This unique equipment was patented in 2010. Studies utilizing the litter applicator have demonstrated a substantial reduction in phosphorus in runoff compared to surface application of poultry litter. Studies of soil Nitrogen (N) mineralization as affected by microorganism populations and manure handling methods were conducted. Studies on tillage system and fertilizer application methods impacts on greenhouse trace gas emissions were conducted. Experimental evaluations of alternative substrate for use in horticulture container production were studied. Research on microbial-based inoculants has led to a patent for their use in N2O emissions reduction when using urea fertilizers. Research was also conducted on the utilization of gypsum as a soil amendment to reduce Phosphorus (P) losses to the environment from poultry litter applications.

4. Accomplishments

Review Publications
Nyakatawa, E.Z., Mays, D.A., Way, T.R., Watts, D.B., Torbert III, H.A., Smith, D.R. 2012. Soil carbon dioxide fluxes in conventional and conservation tillage corn production systems receiving poultry litter and inorganic fertilizer. Journal of Sustainable Agriculture. 36(8):873-892.

Chen, L., Kost, D., Tian, Y., Guol, X., Watts, D.B., Norton, L.D., Wolkowski, R.P., Dick, W.A. 2014. Effects of gypsum on trace metals in soils and earthworms. Journal of Environmental Quality. 43:263-272. doi:10.2134/jeq2012.0096

Smith, K.E., Watts, D.B., Way, T.R., Torbert III, H.A., Prior, S.A. 2012. Impact of tillage and fertilizer application method on gas emissions in a corn cropping system. Pedosphere. 22(5):604-615.

Calvo, P., Watts, D.B., Kloepper, J.W., Torbert III, H.A. 2013. Microbial-based inoculants impact nitrous oxide emissions from an incubated soil medium containing urea fertilizers. Journal of Environmental Quality. 42:704-712.

Torbert III, H.A., Watts, D.B. 2012. Nitrogen mineralization in production agriculture. International Journal of Agronomy. Article ID 989365, 2 pages, doi:10.1155/2012/989365.

Kurtener, D., Yakushev, Y., Torbert III, H.A., Krueger, E. 2013. Definition of zones with different levels of productivity within an agricultural field using fuzzy modeling. Journal of Agricultural Science. 5(5):176-181.

Tewolde, H., Way, T.R., Pote, D.H., Adeli, A., Brooks, J.P., Shankle, M.W. 2013. Method of soil sampling following subsurface banding of solid manures. Agronomy Journal. 105:519-526.

Adeli, A., Tewolde, H., Shankle, M.W., Way, T.R., Brooks, J.P., McLaughlin, M.R. 2013. Runoff quality from no-till cotton fertilized with broiler litter in subsurface bands. Journal of Environmental Quality. 42:284-291.

He, Z., Shankle, M., Zhang, H., Way, T.R., Tewolde, H., Uchimiya, M. 2013. Mineral composition of cottonseed is affected by fertilization management practices. Agronomy Journal. 105(2):341-350.

Celik, A., Altikat, S., Way, T.R. 2013. Strip tillage width effects on sunflower seed emergence and yield. Soil and Tillage Research. 131:20-27.

Last Modified: 10/17/2017
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