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Pre-Sidedress Nitrate Test and Other Crop-Based Indicators for Fresh Market and Processing Sweet Corn

^a Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre (ECORC), Central Experimental Farm, 960 Carling Ave., Ottawa, ON, Canada K1A 0C6
^b Agriculture and Agri-Food Canada, Greenhouse and Processing Crops Research Centre, 2585 County Rd. 20, Harrow, ON, Canada N0R 1G0

View larger version (25K): [in this window] [in a new window]   Fig. 1. Effect of N treatments on the number of total and marketable ears, total and ear dry matter (DM) of fresh-market sweet corn (Temptation) in 2001, 2002, and 2003. The points followed by different letters indicates significant differences (P 0.05) among N rates.

View larger version (20K): [in this window] [in a new window]   Fig. 2. Presidedress nitrate N (mg NO3––N kg–1) in soil at various growth stages of FMSC (Temptation) as affected by fertilizer N treatments in: (a) 2001, (b) 2002, and (c) 2003. Regression equations for V6 growth stage at the 0 to 30 cm (top left within each year) and 0 to 60 cm (top or bottom right within each year) depths are inserted.

View larger version (39K): [in this window] [in a new window]   Fig. 3. Plant total N concentration (g kg–1) of (a) a FMSC (Temptation) and (b) a processing sweet corn (PSC) (Hollywood) at the V6 growth stage in 2001, 2002, and 2003. The bars followed by different letters indicate significant differences (P 0.05) within a year.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Relationships of leaf chlorophyll content (SPAD) and canopy reflectance (NDVI) measured at V6 and V8 stages of fresh-market sweet corn (Temptation) with different fertilizer N rates applied at planting in (a) 2001, (b) 2002, and (c) 2002.

View larger version (12K): [in this window] [in a new window]   Fig. 5. Effect of N treatments on the total dry matter (DM) production and kernel DM yield of a PSC (Hollywood) in (a) 2002, (b) 2003, and (c) 2004. The points followed by different letters indicate significant differences (P 0.05) among N rates.

View larger version (23K): [in this window] [in a new window]   Fig. 6. Presidedress nitrate N (mg NO3––N kg–1) in soil at various growth stages of PSC (Hollywood) as affected by fertilizer N treatments in (a) 2002, (b) 2003, and (c) 2004. Regression equations for V6 growth stage at the 0 to 30 cm (top left within each year) and 0 to 60 cm (top or bottom right within each year) depths are inserted.