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Subsurface Drip Irrigation and Fertigation of Broccoli

II. Agronomic, Economic, and Environmental Outcomes

^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 (44K): [in a new window]   Fig. 1. Response surfaces for broccoli grown during the 1993–1994 season: (a) predicted marketable yield (Mg ha-1), (b) predicted net return ($ ha-1), (c) predicted unaccounted fertilizer N (kg ha-1), (d) Spatial analysis of response surfaces of marketable yield, net return, and unaccounted fertilizer N. Arrows denote the point of maximum response on the surface. The shaded area in (d) represents overlap of the zones of 95% of the maximum predicted marketable yield and net return, and 40 kg ha-1 of unaccounted fertilizer N.

View larger version (52K): [in a new window]   Fig. 3. Response surfaces for broccoli grown during the 1995 to 1996 season: (a) predicted marketable yield (Mg ha-1), (b) predicted net return ($ ha-1), (c) predicted unaccounted fertilizer N (kg ha-1), (d) Spatial analysis of response surfaces of marketable yield, net return, and unaccounted fertilizer N. Arrows denote the point of maximum response on the surface. The shaded area in (d) represents overlap of the zones of 95% of the maximum predicted marketable yield and net return, and 40 kg ha-1 of unaccounted fertilizer N.

View larger version (44K): [in a new window]   Fig. 2. Response surfaces for broccoli grown during the 1994–1995 season: (a) predicted marketable yield (Mg ha-1), (b) predicted net return ($ ha-1), (c) predicted unaccounted fertilizer N (kg ha-1), (d) Spatial analysis of response surfaces of marketable yield, net return, and unaccounted fertilizer N. Arrows denote the point of maximum response on the surface. The shaded area in (d) represents overlap of the zones of 95% of the maximum predicted marketable yield and net return, and 40 kg ha-1 of unaccounted fertilizer N.

View larger version (38K): [in a new window]   Fig. 4. Postharvest soil NO3 concentrations for broccoli during the 1993 to 1996 growing seasons. Bars represent Fisher's least significant difference (P = 0.05).