462 Mineral Nutrition of Plants 



encouraging. Discrepancies between items in the columns means that 

 more work has to be done toward achieving greater accuracy. However, 

 the results are sufficiently good to justify projecting the equation to 

 several of the plantations with which I am associated to determine what 

 yields ought to be obtained at each. 



In arriving at these estimates I used the temperature and light 

 measurements as obtained at each place. Age would, of course, be the 

 same for all the estimates. For the moisture values I used first that level 



TABLE VIII 

 Actual vs. Calculated Growth Units 



Plots Actual Calculated 



A 15 80 M54 



B 1951 1882 



C 2149 1938 



D 2124 2045 



RA 1 194 J 35 8 



RA 1123 1251 



RB 1841 199° 



RC i7 T 7 x 739 



RD 1689 1695 



Average 1708 1706 



which is near the ideal, and second, levels which were actually obtained 

 at each place. 



The conversion of growth units to tons-cane-per-acre was accom- 

 plished by multiplying the average growth unit per day for the crop 

 by the age of the crop, that is, 24.0 months. The resulting value was 

 converted to tons-cane-per-acre by multiplying by the conversion factor 

 0.065. The results are shown in Table IX. In the first column are given 

 the theoretical yields for the light and temperatures actually experienced 

 at the nine places listed, using the same normal moisture curve for 

 each. In the second column the same local light and temperature records 

 were used but the actual moisture level measured on a good crop at 

 each place was used. In parentheses, after each of these yields is the 

 actual yield obtained on the field from which the moisture levels were 



