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Table 2 ANOVA, regression coefficients, and summary statistics for percentage fresh weight increase and dry weights of nonembryogenic tissue.

From: The effects of nitrogen and potassium nutrition on the growth of nonembryogenic and embryogenic tissue of sweet orange (Citrus sinensis(L.) Osbeck)

Source Nonembryogenic tissue
  Fresh Wgt.a Dry Wgt.a
  F Value p-values Regression coefficientsc F Value p-values Regression coefficientsc
Model 87.23 < 0.0001   22.18 < 0.0001  
Linear Mixture 279.34 < 0.0001   50.77 < 0.0001  
   NH4    + 15.24    - 0.98
   K    + 2.63    - 1.20
NH4 * K 290.91 < 0.0001 + 70.70 64.35 < 0.0001 + 1.60
NH4 * [NO3] 7.72 0.0148 - 1.72 2.53 0.1326 - 0.049
K * [NO3] 15.50 0.0015 + 8.34 1.49 0.2409 - 0.035
NH4 * K * [NO3] 10.37 0.0062 + 9.99 0.54 0.4754 + 0.11
NH4 * [NO3]2 0.16 0.6979 + 0.41 0.20 0.6593 + 0.023
K * [NO3]2 0.53 0.4771 + 0.93 0.29 0.5950 - 0.034
NH4 * K * [NO3]2 70.53 < 0.0001 - 44.15 12.10 0.0034 - 0.89
K * [NO3]3 24.16 0.0002 - 11.45 - -  
Lack of Fit p = 0.2641 p = 0.3634
R2 0.98 0.92
R2 adj 0.97 0.88
R2 pred 0.95 0.78
Std. Dev. 1.28 0.06
Mean 13.32 -1
C.V. % 9.63 6.33
Model type reduced quadratic × cubicb quadratic × quadratic
  1. a Data transformation was determined by a Box Cox plot analysis – fresh weight data were transformed by square root and NE dry weight by log base 10.
  2. b Model reduction by backward elimination.
  3. c Presented in coded form. Coding normalizes the factor ranges by placing their low and high range value between -1 and +1 and can thus, be directly compared.