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Subsurface Drip Irrigation and Fertigation of Broccoli

I. Yield, Quality, and Nitrogen Uptake

^a Dep. of Soil, Water, and Environmental Science, University of Arizona, 429 Shantz Bldg. #38, Tucson, AZ 85721
^b Pioneer Hi-Bred International, Inc., P.O. Box 1150, Johnston, IA 50131
^c Colorado State University, Rogers Mesa Research Center, 3060 Highway 92, Hotchkiss, CO 81419

View larger version (53K): [in a new window]   Fig. 1. Response surfaces for marketable yield, head diameter, and head weight. Response surface equations are given in Table 6. Where response surface maxima occurred within the range of the treatments, this point is indicated by a crosshair. The arrow denotes the predicted maximum response at the optimum.

View larger version (20K): [in a new window]   Fig. 2. Response surfaces for broccoli aboveground biomass N for (a) 1993–1994, (b) 1994–1995, and (c) 1995–1996. Contour lines are in units of kg N ha-1. Response surface equations are given in Table 6.

View larger version (27K): [in a new window]   Fig. 3. (a) Cumulative N uptake and (b) daily N flux of broccoli receiving the medium irrigation treatment and 350 kg N ha-1 (1993–1994) or 300 kg N ha-1 (1995–1996).