FAS Abstracts 2004 Meeting Page

Agricultural Sciences (AGR): AGR-5

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Impact of crop management history and fertilization on Sweet corn (Zea mays L.) yield. K.A. SEAMAN, R.N. GALLAHER, R. McSORLEY, and K.-H. WANG. Univ. of Florida, Gainesville, FL 32611.  Nationwide, Florida ranks the highest in state gross receipts (over $100 million annually) for fresh-market sweet corn (Zea mays L.).  Main effects, in a split-plot experiment, were three cropping histories, each beginning in fall of 2002 with sweet corn (history one), cowpea (Vigna unguiculata L.) (history two), and sunn hemp (Crotolaria juncea L.) (history three), respectively, and each history continuing with Austrian winter pea (Pisum sativum subsp. arvense) as a winter cover crop followed by sweet corn in the spring.  Sub effects were three N sources. Sub-sub effects were five N rates (0, 50, 100, 150, and 200 kg ha^-1).  Sweet corn yield was not affected by cropping history.  Fancy ear yield (g m^-2) was related to ammonium nitrate rate (kg N ha^-1) by the 2^nd order polynomial y = 257 + 5.69x – 0.01x², with R² = 0.97 (p < 0.05), which peaked at 770 g m^-2 and 200 kg N ha^-1.