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

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