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Fluid Journal : Fluid Journal 1996-1998
Summer 1996 and quality parameters measured were statistically no different from the top yielding N x water treatment. The seasonal midrib NO3 patterns obtained in these BMP treatments also tracked reasonably near the optimum patterns recorded (Figures 3 and 4). Methodology Site. Experiments were conducted on the irrigation research facility at the Maricopa Agricultural Center, University of Arizona. Water. Three rates of water and three rates of N were applied in two randomized complete block factorial experiments---one for broccoli and one for cauliflower. There were four replications. A tenth water x N treatment was also included. The BMP treatment received the optimum water treatment and N fertilizer applications were based solely on preliminary midrib analysis calibrations for both crops. Delivery system. Water and N were delivered through a subsurface drip irrigation system using one line of tubing injected 6 to 8 inches deep along the centerline of raised soil beds spaced every 40 inches. Nitrogen was supplied in five to six split applications injected into the drip irrigation system. Water was applied daily using an automated system Yield -- tons/A $/A 10 8 6 4 2 0 89-D 178-D 267-D 89-0 178-0 219-0 267-0 89-W 178-W 267-W N rate -- lbs/A (D=Dry, O=Optimum, W=Wet) Figure 1. Marketable yield and net return for broccoli in response to N x water treatments, Doerge, et al., University of Arizona, 1994-95. Yield $/A 2150 1850 1550 1250 950 650 Figure 2. Marketable yield and net return for cauliflower in response to N x water treatments, Doerge, et al., University of Arizona, 1994-95. Yield -- tons/A $/A 10 8 6 4 2 0 89-D 178-D 267-D 89-0 178-0 260-0 267-0 89-W 178-W 267-W N rate -- lbs/A (D=Dry, O=Optimum, W=Wet) 1700 1400 1100 800 500 200 Yield $/A
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