14 



N. H. AGR. EXPERIMENT STATION. 



[Bulletin 203 



intervals of one week during the active growing season and then at inter- 

 vals of two weeks and finally at intervals of one month. Analyses are being 

 made of these samples to determine moisture, total nitrogen, free reduc- 

 ing sugars, sucrose, maltose, starch and acid hydrolyzable material, ash, 



Tj'pe of screen used in experiment in study of shading horticultural plants 



total sulphur and total phosphorus. Leaf areas from the spurs were measured 

 to determine the correlated synthesizing area at each period. The seasonal 

 growth of and per cent, of bloom formed by each tj-pe of spur investigated 

 will be determined in the spring of 1922; and with this information it is be- 

 lieved that the light investigation can be more advantageously prosecuted. 

 Effects of Girdling xi-pon Fruit Production. The girdling experiment con- 

 ducted in 1919 was repeated in 1920 using another set of trees. At the 

 time of girdling on June 1, samples showed practically no difference in com- 

 position; but on July 8 and Sept. 4 the samples from the girdled trees were 

 lower in total nitrogen and moisture and higher in free reducing sugars and 

 sucrose. This corresponds to the results of the previous year. The gird- 

 ling of the trees in both years increased fruit bud formation. 



Winter Injury op Apple Roots. 



The subject of winter injury to apple trees is a serious one to fruit growers ; 

 and an investigation along this line has been started at this Station dur- 

 ing the past year by Mr. Potter in continuation of previous studies made 

 by him at the University of Wisconsin. The object of the study will be four- 



