826 EXPERIMENT STATION EECORD, 



added at the rate of 100 ks. nitrogen per hectare. When only one-half of this 

 amonnt was applied nearly identical yields were obtained in the case of pots 

 receiving nitrite and those to which no nitrite was applied. An impurity of 

 even as much as 20 per cent of nitrites in the nitrate therefore appeared to act 

 as a stimulant instead of injuring the crops experimented with. 



On the content of food materials in root erops at different dates of harvest. — 

 Trials were conducted during three seasons, 1004-1906, with fodder beets, sugar 

 beets, and mangels, samples being harvested twice a month during September 

 to November, and subjected to chemical analysis for dry substance, sugar, and 

 total and albuminoid nitrogen. Out of 10 cases 5 showed a maximum content 

 of dry matter on November 1, 3 on October 15, and 2 on October 1. The maxi- 

 mum and minimum sugar content, as a general rule, corresponded to the dry 

 matter in the roots, while the nitrogen content showed but small and irregular 

 variations in the different samples. The maximum yields of roots and of dry 

 matter, on the other hand, occurred once at October 1, 6 times at October 15, 

 and 3 times at November 1. While the best time of harvesting root crops will 

 vary from year to year with different factors, like character of soil, climatic 

 conditions, kind of seed, etc., it may be said that the results of the trials made 

 so far indicate that the absolute increase in the dry matter of root crops, es- 

 pecially of mangels, under the agricultural conditions of Sweden, is completed 

 about the middle of October, or shortly after this period. 



Culture trials to determine in hoiv far the effects of nitrogenous fertilizers 

 depend on the character of the simultaneous phosphatic fertilization. — The 

 strong chemical reaction occurring when certain new nitrogenous fertilizers, 

 especially calcium cyanamid and nitrogen lime, are mixed with superphosphate 

 suggests that the nitrogenous compounds are radically changed in this mixture, 

 and that their fertilizer value might thereby be reduced. Trials with oats 

 grown in glass cylinders filled with sandy soil were therefore made to study this 

 question, a series of cylinders being fertilized with different forms of nitroge- 

 nous fertilizers with either superphosphate or Thomas phosphate, one set receiv- 

 ing lime In addition and the other no lime. The results obtained at harvest 

 showed that the superphosphate was in some cases somewhat more, in other 

 cases somewhat less effective than Thomas phosphate. It was not found disad- 

 Aantageous, therefore, to use the former fertilizer with the new nitrogenous 

 fertilizer materials, like calcium cyanamid or nitrogen lime. 



Culiure trials ivith oats and harley to determine in hoiv far the effect of phos- 

 phatic fertilizers depends on the character of the simultaneous nitrogenous 

 fertilization. — This is a report of progress in continuation of an investigation 

 commenced in 1905 (E. S. R., 17, p. 1052), precipitated tricalcium phosphate 

 being in this series applied in the place of bone meal for oats, and bone meal 

 applied for barley, instead of for oats as in the first year's trials. 



Cooperative fertilizer trials in Malmohus County, Sweden, 1906, M. Wei- 

 bull and G. Nokdin (Malmo. Ldns K. HushuU. Siillsk. Kvrtlsskr., 1907, No. 1, 

 pp. 197-265). — The report contains the usual account of the cooperative fer- 

 tilizer trials with small grains, roots, and hay crops conducted during the year 

 by the Malmohus County Agricultural Society at 52 different farms In south- 

 ern Sweden. The following subjects are discussed in the report: The value 

 of different potash fertilizers for small grains and root crops, trials with cal- 

 cium cyanamid and nitrate, ammonium sulphate v. sodium nitrate for potatoes, 

 and further trials on the effect of artificial fertilizers on the quality of root 

 crops. 



Report on cooperative fertilizer trials conducted by the Swedish Moor Cul- 

 ture Association, 1906, A. Bauman and H. von Feilitzen (Svenska Mosskul- 



