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Fertilizer Residence Time Affects Nitrogen Uptake Efficiency and Growth of Sweet Corn

^a Univ. of Florida, IFAS, Agricultural and Biological Engineering Dep., 234 Fraziers-Rogers Hall, Gainesville, FL 32611-0570
^b Univ. of Florida, IFAS, Agronomy Dep., 304 Newell Hall, Gainesville, FL 32611; Wageningen Univ., Biological Farming Systems/Plant Production Systems Marijkeweg 22, 6709 PG, Wageningen, The Netherlands

View larger version (35K): [in this window] [in a new window]   Fig. 1. Overview of soil N uptake monitoring (SUM) columns (Adapted from Scholberg et al., 2001).

View larger version (31K): [in this window] [in a new window]   Fig. 2. Average air temperatures (dotted lines, left axis), cumulative uptake temperature (non-dotted lines, right axis), and precipitation at the experimental location during fall 2004 and spring 2006.

View larger version (22K): [in this window] [in a new window]   Fig. 3. Weekly (A) and cumulative (B) crop water use of corn as effected by residence time (tR = 1, 3, or 7 d) for fall 2004. Error bars represent standard error from the mean, n = 4. Treatment means followed by the same letter are not different according to Duncan's test at P 0.05.

View larger version (40K): [in this window] [in a new window]   Fig. 4. Effect of residence time (tR = 1, 3, or 7 d) on the weekly N fertilizer uptake per plant, (A) fall 2004 and (B) spring 2006. Calculated cumulative N uptake per ha during (C) fall 2004 and (D) spring 2006 of sweet corn. Error bars represent standard error from the mean, n = 4. Treatment means followed by the same letter are not different according to Duncan's test at P 0.05.

View larger version (24K): [in this window] [in a new window]   Fig. 5. Correlation between root length density (RLD, bottom axis) or root dry matter (RDM, top axis) versus (A) ear dry matter (yield, left axis) and (B) N plant accumulation (right axis) for corn cultivated during fall 2004 and spring 2006.

View larger version (43K): [in this window] [in a new window]   Fig. 6. Effect of residence time (tR = 1, 3, or 7 d) on the calculated weekly N fertilizer uptake efficiency (A) and cumulative N fertilizer uptake efficiency (FUE) of (B) sweet corn. Error bars represent standard error from the mean, n = 4. Treatment means followed by the same letter are not different according to Duncan's test at P 0.05.

View larger version (42K): [in this window] [in a new window]   Fig. 7. Effect of residence time (tR = 1, 3, or 7 d) on the calculated weekly potential N fertilizer leaching rate in kg N ha–1, (A) fall 2004 and (B) spring 2006. Cumulative potential N leaching during (C) fall 2004 and (D) spring 2006 of sweet corn. Treatment means followed by the same letter are not different according to Duncan's test at P 0.05.