28 N. H. AGR. EXPERIMENT STATION. [Bulletin 12 



in practically every case where the growth is checked the tem- 

 perature dropped noticeably and vice versa, but even here we can 

 see an occasional case which is exactly opposite. The maximum 

 and minimum temperatures are given above and below the broken 

 line, respectively, the latter representing the mean temperature. 

 The broken line above is the mean humidity curve. The instru- 

 ments recording these data are located in the orchard. 



By examining the data in Tables Nos. 9, 10 and 11, it will be 

 seen that the plots behave differently, depending somewhat upon 

 the type, of treatment they receive. In Table No. 11 (1916) it 

 will be observed that Plot 1 shows cessation of growth first while 

 Plot 2 soon follows, neither of these plots were cultivated that 

 season but Plot 2 is in a better condition for growth than Plot 1 

 since it is tilled every other year while the latter plot is contin- 

 uously in sod. Plot 3 next ceases to grow followed by Plot 4, 

 while Plots 7, 8, 9 and 10 grow up until after July 17th. The 

 rainfall doubtless explains this since the seasons 1913 and 1914 

 both being dry in July they ceased to grow at a much earlier date. 

 Of these fertilized plots which also run higher in moisture, Plot 

 9 showed the greatest growth up until the last and this one re- 

 ceives a heavier application of nitrogen fertilizer than the others, 

 which may explain it. 



In Table No. 10 (1914) it is striking to notice how Plot 4 con- 

 tinued to grow after the plots on either side of it had ceased 

 growth. This plot is cultivated until September 1, while in the 

 others the cultivation is stopped on July 10 when they are seeded 

 to a cover crop. 



GRAND PERIOD OF GROWTH. 



It will be seen from the charts that the grand period of growth 

 in this orchard lasts about 25 days, beginning somewhere between 

 the 20th and 25th of May and practically ceasing the latter part 

 of June, depending on the treatment of the plot and the season. 

 " Grand period" as here used refers to the period in which prac- 

 tically all the growth is made, but does not include the second 

 growth which under certain conditions may continue the period 

 somewhat. 



