Undergraduate Internship
نویسنده
چکیده
A study on six plots of corn was conducted on the St. Andrews School farm near Townsend, DE to compare the runoff water quality characteristics between pelletized broiler litter (PBL) and conventional fertilizers, in this case urea. The objective of this comparison was to see whether or not PBL is a suitable replacement for conventional fertilizer. Within the six corn plots, three of the plots were conventionally tilled (CT) and three were under no-till treatment (NT). In each of the tilling methods one of the plots was fertilized with PBL, one with urea, and one was left unfertilized (control plot). Five-gallon plastic buckets were placed at the lower end of each of the plots in order to collect rainwater runoff. Sampling was performed following natural rainfall events which were monitored using the Delaware Environmental Observation System rain gauge in Townsend, DE. These samples were tested for both nutrients, including nitrate-N (NO3-N), ammonium-N (NH4-N), and total-P (TP), as well as trace metals aluminum (Al), arsenic (As), calcium (Ca), copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn). Although no statistical difference was found in the average concentrations of both the nutrients and trace metals, comparison of total mass for these materials indicates that overall in the CT plots PBL tends to give off more total mass while in the NT plots urea tends to give off more total mass. These results suggest that PBL applications may have a greater potential for releasing nutrients and trace metals in surface runoff.
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