6S! 



practically;- three times ^'^•^^ ■ >-'■■ ^■"■r ^'^e state. It -ill he 



observed that this period has high values of sxmshine and of 

 the physiological temperature index and a Io-a' value of evapora- 

 tion, s, ^combination o-?' r^n ■■-,'\ ' ■^.: r.-- c. -•■^•-.'o — r^iild be expe'?t'-'' *<- '^p- 

 optimal for plant grov/th. Tiie iiigii value of leaf-product for 

 the oeriod beginning -June 13 as compared to those beginning 

 May ?n pr^"! ra''' ^"^ i" ■'^'••^"cbably related to the r-"; m*: ' v^iy low 



evaporation rate luring the ■)eriod beginning J'une_ 13, The 



sWovj Similar- o<vvvvd*t\"a-',aVfi^a£<e^ bt^T"ti^4, pJa^rr c'.ccrSi 

 periods beginning 'July 10 and Aug. 7 for f-e latter are lacking 



and no r>c- t \--.r * p^^r^ o-^* ^hp rerio-lK • :^ !'p,P8ible. ""or Col^inan, 

 the leaf-pi-oduot follov/s the graph of temioerature values in gen- 

 eral from the period beginning May 13 to .the period beginning 

 July 22. The relafivoly lovv values of t^'- l^--^"^"-n-,-oduo t- for the 

 periods beginning Aug. 5 and Aug. 19 cannot be Scv'-isfactorily 

 correlated with the climatic dati. For Saston, high values of 

 the temper -ture indices seem to account for th^^ iii gh values of 

 tibe leaf-product for the periods beginning Jtily 6, July 20, 



r 



Aug. 3, and Aug. 17. The graph^leaf-product lies well below the 

 grai-^h of •^er'-»-^'^"!"«+^nr'= values dur J - - ^'-^^e last part of t^"^ 

 T!be period beginning Aug. 17 would be oxoeoted to ehow a higher 

 value for th'3 plant grovth r.i, te than is actually found but the 

 lOY/ value of simshine for this period --- explain the xu, plant 

 value. For Princess Anne the leaf-product graph follows the 

 temperature grar)h practically throughout the season. Evapora- 

 tion and sunshine intensity are both lor,- '' - ^'-\s stat ' 

 evaporation would therefore not be expected to influence the 

 plants. '^he low sim?.h5r aes for the periods beginning 



June 23, July 7, .;,.:„, .x, .. ,- ' .-. ay be related to 



the fact thaJt leaf-product aues not show values as high for 



