1917] SOILS FERTILIZERS. 819 



differ greatly and stood between the tankage and dried blood. Of the nonle- 

 guiues, timothy stood ahead, but all were low, the yields with green wheat and 

 rye being only a little more than the check. The percentages of nitrogen in the 

 dry matter were fairly constant, the lowest being 0.85 per cent, and the highest 

 1.117 per cent. The highest recovery of nitrogen was 66 per cent with nitrate 

 of soda. The ammonium sulphate, dried blood, and tankage followed in the 

 order named. The highest recovery with the green legumes was 39 per cent, 

 with Canada field peas, and the lowest 35.1 per cent, with alfalfa. The highest 

 recovery with the nonlegumes was 19.3 per cent, with timothy, while both the 

 others fell below 5 per cent. 



" The results emphasize the desirability of the legumes as a green manure 

 crop rather than the nonlegumes, for not only do the legumes furnish more 

 nitrogen but that which they do furnish is far more available." 



Further experiments on sandy loam soil showed that the percentages of nitro- 

 gen recovered were lower in all cases than in the first experiments. Nitrate of 

 soda stood first with ammonium sulphate second. The recovery with Canada 

 field peas was almost equal to the recovery from ammonium sulphate, while the 

 recoveries from the blood, tankage, alfalfa, and vetch were somewhat lower but 

 ran very close together. There was no recovery from rye and less than 1 per 

 cent from wheat. 



Nitrogen utilization in field and cylinder experiments: The influence of 

 the mechanical composition of the soil on the availability of nitrate of soda 

 and dried blood, J. G. Lipman and A. W. Blaib (New Jersey Stas. Rpt. 1915, 

 pp. 213-223, pis. 4). — This is an account of a continuation during 1915 of ex- 

 periments begun in 1911 (E. S. R., 34, p. 130). 



" For the first crop, the cylinders to which nitrate of soda and dried blood 

 were applied invariably gave higher yields of dry matter than the check cyl- 

 inders. Likewise nitrate of soda invariably gave a higher yield of dry matter 

 and a higher recovery of nitrogen than dried blood. The percentage of nitro- 

 gen in the dry matter ran quite uniformly for the different treatments and 

 throughout the different series. The average recovery of nitrogen from nitrate 

 of soda for all series, first crops, was 54.89 per cent, and the average for 

 dried blood 43.28 per cent. The highest recovery from nitrate was 64.09 per 

 cent from cylinders containing 20 per cent of sand, and the highest from dried 

 blood was 49.93 per cent from cylinders containing pure shale soil. Taking 100 

 as representing the availability of nitrate nitrogen, on the same basis the 

 availability of dried blood nitrogen was 79.11. 



" With the second or residual crop the average yield of dry matter with dried 

 blood was somewhat greater than the average with nitrate of soda or the 

 average on the check cylinders. The average on the check cylinders was almost 

 as great as that from the nitrate cylinders. ... In three out of the ten series 

 there was no recovery of nitrogen from the nitrate cylinders, and in most cases 

 the recoveries from the other seven were low. There was some recovery from 

 dried blood for all series, the average being 6^2 per cent. In spite of the fact 

 that the dried blood shows a higher recovery in the residual crop than nitrate 

 of soda, when the combined recoveries are considered it is found that the nitrate 

 stands first in all series except [one]. The average combined recovery for 

 nitrate was 57.02 per cent and for dried blood 49.6 per cent. Again taking 100 

 as representing the availability of nitrate nitrogen for the combined crops, the 

 availability of dried blood is represented by 86.36." 



Lime as a factor in the utilization of nitrog'en, J. G. Lipman and A. W. 

 Blair {Neiv Jersey Stas. Rpt. 1915, pp. 204-213, pis. 2). — Experiments on the 

 influence of liming on the utilization of nitrogen in acid soils showed that " with 

 an abundant supply of organic matter and carbonate of lime a crop is obtained 



