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ABSTRACT
The concern surrounding phosphorus (P)-enrichment of surface waters has lead several states to adopt P-based nutrient management planning strategies regarding land-application of broiler litter. When litter is applied on a P-basis, as much as five times more receiving cropland may be needed compared with nitrogen (N)-based applications. Additionally, many crops have N fertilizer requirements greater than what can be applied on a P-basis, resulting in additional N needing to be supplemented as a commercial source. One of the few crops that may be able to have its N requirement satisfied by a single, P-based litter application is snap bean (Phaseolus vulgaris L.). The objectives of this study were to evaluate the impact of broiler litter applications on snap bean yield and quality, pod nutrient composition, and soil chemical characteristics. A field experiment was conducted in Virginia from 1996 to 2000. Broiler litter and commercial fertilizer rates included 22, 67, and 90 kg N ha−1. Pod samples and surface soil samples were collected and analyzed following the 2000 harvest. The 67-kg N ha−1 broiler litter rate resulted in pod yields equivalent to those obtained using commercial fertilizer with no effect on pod quality or nutrient content. However, increases in Mehlich 1-extractable soil P, copper (Cu), and manganese (Mn) were observed. At the 90-kg N ha−1 litter rate, extractable soil potassium (K), calcium (Ca), and zinc (Zn) also increased, while pod yield decreased. When litter was applied at 22 kg N ha−1 (approximate rate according to a P-based nutrient management plan) no effects on soil chemical characteristics were observed, however, maximum yield was not attained.