Evaluation of Controlled-Release Fertilizers for Northeast Florida Chip Potato Production |
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Authors: | Jeff E. Pack Chad M. Hutchinson Eric H. Simonne |
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Affiliation: | Horticultural Sciences Department , University of Florida , Gainesville, FL, USA |
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Abstract: | ABSTRACT Controlled-release fertilizers (CRF) were compared with ammonium nitrate (AN) in a potato (Solanum tuberosum L.) production study at the University of Florida farm in Hastings, FL, in 2002. Treatments were no nitrogen (No-N), AN, and nine CRFs at 146 kg ha?1 N and 225 kg ha?1 N. CRF7 (146 kg ha?1 N) resulted in highest total and marketable yields at 33.7 MT ha?1 and 29.4 MT ha?1, respectively. Tubers from the AN (225 kg ha?1 N) and CRF9 (225 kg ha?1 N) treatments had the highest specific gravity at 1.073. Nitrogen removal efficiency was highest in plants in CRF1 (43.0%) and CRF7 (47.3%) plots. Both were significantly higher than AN-treated plants. At 39 days after planting, NO3-N and NH4-N concentrations in lysimeter water samples were significantly higher in AN treatments. Leaf tissue N concentrations were sufficient throughout the growing season in all treatments except No-N. |
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Keywords: | polymer-coated urea nutrient-use efficiency leaching chips crisps |
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