81 



beginning Sept. 6 is higher than would be expected from the 

 low temperature value due possibly to a relatively high sun- 

 shine intensity during the last tro-weeks of growth. 'R'or 

 the four-week periods beginning Sept. 22 and Oct. ? both stin- 

 light and temperature index values are low for both of the two- 

 week periods constituting eadh four-week period. 



?or Monrovia, the dry weight graph rises to a high value 

 for the second period of the growing season in spite of high 

 evaT)oration rates throughout the ^oeriod. From the second per- 

 iod to the third period the graph of dry weight descends, 

 probably following a corresponding decrease in sunshine inten- 

 sity shown by the four-week graph. The still lower v:-.lue 

 of dry weight for the period beginning June 29 m'-.y be explained 

 by the high evaporation ra+"e for the two-week period beginning 

 J;ly 13. The minimum in the dry weight gra^h at the period 

 beginning July 13 would be expected from the low temoerature 

 index value and high evaporation rate for the last two weeks 

 of this period fperiod beginning July 27 on the two-week graph). 

 The rise in the dry weight from the peridd beginning July 13 

 to the period beginning July 27 is r)robably related to the 

 relatively high temiierature index value during the last two 

 weeks of the period beginning July 27 although evaporation is 

 also high and light a little below the ^easo-^al average fsee 

 the period beginning Aug. 10 on the two-week graph). ?'or 

 the four-week period beginning Aug. 10 dry 7;ei;;;'ht shews a 

 relatively lew value as woiald b-^ expected from the very lov; 

 light value of the two-week period beginning Aug. 24 which is 

 the last two weeks of four-week period in question, fi'or the 

 four-week period beginning Aug. 24 dry weight rises in spite 



