38 



N. H. AGE. EXPERIMENT STATION. 



[BuUetin 183 



The following experiments were undertaken in order to arrive 

 at some notion of the proportion of spray material that will fail 

 to lodge on the tree. 



The plan of the experiment involved using large squares of 

 cloth beneath trees to catch the drip, weighing these squares 

 before and after spraying. It was necessary, therefore, first to 

 determine the amount of evaporation that would take place from 

 the cloth during the time that the tree was dripping. 



Preliminary tests showed that 5 minutes covered the time that 



Table No. 10. Result of Evaporation Tests. 



Rccovereit 



j^ppUciU 

 Recov«Te<il 



AopLiccb. _ 



IXoy 



yApplied-. m 

 K«covere(tLi 



ApipLred,.  



^ppLbed/ I 

 Re coireted. L 



Affile.^. I 

 Recov«re<^ L. 



^ppL.e*  

 Kccoirerett. L. 



9S« 



Rtcovere<l'.L 



y-r 



lOS ly 



J izao/ 



J liOiof, 



^veca.)e ix- Sun: 



, In SKade. 



IZt.ef-. 



il^cjt 



tlJ. cj. 



Loss -55.^% 



Lo96.29.bto 



Lo6f2 7.3% 



Loss-ys;% 

 yfi/Hi 



Loss-/ ^8% 



Los&'35./% 



Lo4i.j?.8r„ 



^m 



Loss'Sdyy. 



B3?53 



Loss= /r.ar. 



 



Loss 32.7% 



^ 



Loss 33.7% 



Left-hand column shows amounts applied to ground cloths (in black) with 

 amounts recovered by weight at the end of five minutes (in white). Right- 

 hand column shows the same reduced to a percentage basis, the white indicat- 

 ing percentage recovered on cloth and the diagonal shading indicating per- 

 centage lost by evaporation. 



