Periodical Literature 517 



The dtiration of growth on the average was from middle of May 

 to middle July. Early cessation occurs in young (four-year-old) 

 and with poor weather conditions. Total growth in young spruces 

 increases from year to year, hence strictly even-aged stands are 

 necessary for comparison. For securing an accurate average on a 

 site, 25 spruces sufBce. The best time for comparative measure- 

 ments is when the maximum growth occiirs, beginning of June, 

 when differences are greatest. A dry site which warms up more 

 quickly produces early beginning, rapid increase with increased 

 temperatiire and early close of growth. With elevation, the shoots 

 remain shorter, but the beginning of sprouting occurs at very 

 nearly the same time. 



In undergrowth conditions only ^/s to ^/^ of the increment in 

 the open stand was secured. 



For a continuation of such investigations, the author suggests 

 as desirable still greater uniformity in age, height, growth, habit, 

 measuring of the progress, temperature, etc., in aU stands on the 

 same day, and more frequency, especially with weather changes. 



Der Gang des Hohenwachstums in jungen Fictenbestanden im Jahr 1913 und 

 die begleitenden Bedingungen. Forstwissenschaftliches Centralblatt, March 

 1916, pp. 55-75, 131-50. 



Rusnov reports from the Austrian Experi- 



Fertilizers ment Station experiments in the use of ferti- 



in lizer in growing pine and spruce, especially 



Nurseries the effect of phosphoric acid additions. The 



first trials were made with deglutinized bone 



meal and Thomas slag, both of which are slowly soluble and should 



therefore, be of more persistent value. The result in general was 



very moderate, greatly varying quantities of fertilizer (from 100 



to 800 kg. P2O2 per ha.), producing no demonstrable differences in 



the development of the plants. Evidently, the conifers cannot 



make use of phosphoric acid in not easily soluble form. 



Fertilizing in comparison with a combination of potash, ammonia 

 sulphate and superphosphate showed very variable results, and it 

 was learned that the character of the locality, the site, and weather 

 had a great influence on the effectiveness of the fertilizer. The 

 plants were left two years in seedbed and then transplanted for one 

 year, being measured in height after two and three years from seed. 

 The actual average and the percentic increment, the latter based on 

 the results of the imfertilized plats, are given in tables. 



