Abstract
Cowpea [Vigna unguiculata (L.) Walp.] cover crops were grown in a rotation with broccoli (Brassica oleracea L. var. italica Plenck.), spinach (Spinacia oleracea L.), and turnip greens [Brassica rapa L. var. (DC.) Metzg. utilis] to evaluate the legume's ability to remove excess P from soils when poultry litter was used as a fertilizer. Fertilizer treatments were: 1) litter to meet each crop's recommended preplant N requirements (1×); 2) litter at twice the recommended rate (2×); and 3) urea at the 1× rate as the control. Following the vegetable crops, cowpeas were planted on half of each replication, while the other half was fallowed. The cowpeas were harvested at the green-shell seed stage and then underwent a simulated haying operation to remove remaining shoot material from the field. Soil samples were taken at 0-15 cm and 15-30 cm depths at the onset of the study and after each crop to monitor plant nutrient concentrations. The cowpeas lowered soil test N concentrations at both soil sampling depths, but had no consistent effect on soil test P concentrations. Soil test P at the 0-15 cm depth was not increased by litter at the 1× rate but was increased by litter at the 2× rate relative to the urea control, regardless of cropping system. Poultry litter was effective as a fertilizer for all three vegetable crops, but the 1× rate appeared inadequate for maximum production of broccoli and turnip greens.
Department(s)
Environmental Plant Science and Natural Resource
Document Type
Article
DOI
https://doi.org/10.21273/hortsci.37.3.496
Rights Information
HortScience is an open-access publication that adheres to Creative Commons licensing: CC BY-NC-ND 4.0. You may share, copy and resdistribute this material for non-commercial purposes in any medium.
Publication Date
2002
Recommended Citation
Alsup, Clydette M., Brian A. Kahn, and Mark E. Payton. "Using Cowpea to Manage Soil Phosphorus Accumulation from Poultry Litter Applications in a Cool-season Vegetable Rotation." HortScience 37, no. 3 (2002): 496-501.
Journal Title
HortScience