Feb.4.i9i8 Variability of Yields of Fruit Trees and Field Trials 275 



discarded from the calculation. This left 32 "treated" plots whose 

 "normal" yields were computed. The arrangement of these plots and 

 their yields are given in Table XI. 



Table XI. — Arrangement and yields of lo-tree plots of the navel-orange grove 



{Arlington) 



[Yield expressed in tens of pounds] 



108G 84* 



150* 88B 



112 control 119* 

 124* 146 control 



121F 151* 



159* 174C 



142E 132* 



148* 182 D 



139 control 166* 

 153* 174 control 



177D 180* 



179* 169E 



176C 131* 



188* 162F 



183 control 183* 

 178* 147 control 



203B 188* 



182* 168G 



206A 223* 



199* 201H 



219 control 191* 

 191* 228 control 



Computing the normal yields of these plots by the five formulas above 

 described gives the results shown in Table XII. 



Table XII. — Value of different formulas for computing the coefficient of variability and 

 probable error of yields of oranges in lO-tree plots in Arlington grove 



* Guard row. 



