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Nitrogen and Water Interactions in Subsurface Drip-Irrigated Cauliflower

I. Plant Response

^a Dep. of Soil, Water, and Environmental Sci., Univ. of Arizona, 429 Shantz Building, Room 38, Tucson, AZ 85721 USA
^b Pioneer Hi-Bred International, Inc., P.O. Box 1150, Johnston, IA 50131 USA
^c Western Farm Service, 24730 Ave. 13, Madera, CA 93637 USA

View larger version (28K): [in a new window]   Fig. 1 Normalized yield response variables for cauliflower, 1993–1996 growing seasons. Contour lines represent relative response (%), SWT is soil water tension (kPa), N = N rate . The intersection of the arrows indicates the point of maximum predicted response. (A) Relative yield = -28 + 3.58 x SWT + 0.45 x N - 0.083 x SWT2 - 0.0036 x N x SWT - 0.0004 x N2, model R2 = 0.75; (B) relative curd weight = -13 + 2.91 x SWT + 0.42 x N - 0.054 x SWT2 - 0.0036 x N x SWT - 0.0004 x N2, model R2 = 0.70; (C) relative curd diameter = 37 + 0.75 x SWT + 0.27 x N + 0.003 x SWT2 - 0.0017 x N x SWT - 0.0003 x N2, model R2 = 0.78

View larger version (31K): [in a new window]   Fig. 2 Nitrogen accumulations for cauliflower receiving the medium irrigation treatment and 340 kg N ha-1 (1993–1994) or 300 kg N ha-1 (1994–1995 and 1995–1996). (A) Cumulative N uptake; (B) daily N flux