GdG EXPERIMENT STATION RECORD. 



the nortli slope, a change 8.02° g-reater for the south thau for the north 

 slope. Similarly, the change in the north side of the tree trunks was 

 1.89° (8.19 — 6.30) greater for the south slope. 



The maximum change occurring in any one clay in the south side of 

 the trees was 52.1o for the tree on the south slope, and 36.6° for the one 

 on the north slope, a difference in the amount of change of 16.5°. 



"It is evident from these data that in orchards which are planted on southern 

 exposures the trunks of the trees must be subjected to much widfr changes of tem- 

 perature during eacli 24 hours than where they are planted on northward slopes. 



"It will be noticed that tlio table shows, not simply that the temperature of the 

 south side of the tree trunk on the south side of the hill becomes much warmer at 

 midday, but also that it is the coldest in the coldest part of the day, and it will be 

 seen that this is true, not simply in the average for the four months, but that it is 

 also true for the mean of each individual month. On the north slojie of the hill 

 there is a slight tendency for the north side of the tree trunk to be coldest in 

 the morning, while at the summit of the hill the two sides have still more nearly the 

 same'temi^erature in the morning when it is coldest. These small dilferences are due 

 to the fact that the radiation of heat from the groiind on the ujihill side against the 

 tree trunk is stronger than it is on the downhill side." 



The records of air thermometers for the three months in 1895 were 

 platted in the form of curves, and show "that for each of the three 

 months the diurnal range of temperature is least on the summit, it 

 being colder there in the middle of the day and warmer in the night, 

 the difference increasing from January to March, where it is very 

 marked . . . and that the south side of the hill is colder than the 

 north side in the latter part of the night, just as was indicated by 

 the thermometers placed in the tree trunks." 



Irrigation of stra^vberries, E. S. Goff ( Wisconsin Sta. Bpt. 1895, 

 jpp. 289-292, figs. 2). — A continuation of work reported in the Annual 

 Eeport of the station for 1894 (E. S. E., 8, p. 310). Three plats, each 

 comi)rising 12 50-foot rows of Warfield and 4 rows of Wilson berries, 

 were used in the test. The first plat had been well irrigated the 

 previous season, received 3 ajJiilications of water between May 25 and 

 June 22, and yielded 561.3 boxes; the second plat had been well irri- 

 gated in 1894 but was left without watering in 1895, and yielded 111.6 

 boxes; while the third plat, which had never been irrigated, yielded 

 66.2 boxes. The results are shown graphically and by illustrations of 

 the yields from single pickings of irrigated and unirrigated rows. 



"Late summer irrigations, however beneficial they may be in pro- 

 ducing plenty of vigorous plants, will be rendered nearly futile unless 

 supplemented by timely irrigations when the fruit is forming and 

 maturing." 



Experiments in strawberry culture, E. S. Goff ( Wisconsin Sta. 

 Rpt. 1895, pp. 279-288).— X table is given showing the yield for 3 con- 

 secutive seasons of a plat of 47 varieties. The plants were grown in 

 matted rows, received good culture, and were well protecttd in winter. 

 After gathering the first and second crops the matted rows were nar- 

 rowed to 12 in., the remaining plants well thinned, and a top-dressing 



