Author: Pack Jeff Hutchinson Chad Simonne Eric
Publisher: Taylor & Francis Ltd
ISSN: 0190-4167
Source: Journal of Plant Nutrition, Vol.29, Iss.7, 2006-06, pp. : 1301-1313
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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, NO 3 -N and NH 4 -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.