highly significantp < 0.0001
Y 1 = 6.119 + 1.815 A - 4 .626B - 18 .608C + 0.436AB + 0.580AC - 0 .887BC - 0 .633A 2 + 3.269 B 2 + 15.650 C 2 Y 2 = 18.883 + 13.360 A + 49.779B - 186 .192C - 9 .063AB + 7.010AC - 24 .790BC - 3 .289A 2 - 13.194 B 2 + 150.865 C 2 The yield model (Y 1 ) had an F-value of 105.270, indicating highly significant level differences ( p < 0.0001).