5IJ 



expected to ahov.- certain relations to the cliiaatiG vcLxaes. 

 If the asswoed relation holds it would be supposed, that the 

 plants woiild show a high growth ra-*"e Thenever the temperature 

 value is high unless at the sane tir.-: " ' ' -r light iu v'ery 

 fi.e. shovinp- a value of 80 or less) or the evaporation very 

 hisrhfi.e. shoTTing: a value of IS 5 or .Tiore), V/hen the temnera- 

 turs index is Ic^^/, the plant gro\7t!:i would be expected to 

 o'lov/ low values, the amount by v/hioh it is depressed being less 

 in *"hose r^eriods for which -^he other climatic conditions are 

 favorable .than in the periods fur 7;:-ica they are unf avoi-able. 

 "High" and "low" vrill be used, in general, as above and belov: 

 ■'rh''' seasonal avera^re for the sta''"e, since it is obviourl^' im- 

 juLbj/ole ill :::.■■: i^uali tative method of treatment used in -^his 

 study to assign any definite values to these terms. Also the 

 correlation betv;een the riant and climatic data for the two-week 

 periods will take into c..o';jount only the leaf-product. This is 

 done for the reason that the leaf-product, ie approximately 

 proportional to the leaf area anl dry weight for soy-beans 



V Hildebrandt, ^. ". , Leaf-product as an t nder of growth 

 in soy-bean. Johns Hopkins T^niv. ']irc. Inarch, 1917. 



as has been sho-Ti by Mclean md by t'-.e wr'ter in a r;revioiis 

 paper; and ,:it ^r^ 7.yj.gnt of plan's is ^as most generally 

 accepted criterion of their growth. The previous discussion 

 of the relation bet^reen leaf-product and ? tem height, has shown 

 tha-^ they - ■ ■ ' • - .'• -_ ■ .. ^ aultur-^^^, 



to the same extent. A considerr" ' of the stem height in 



