126 EXPEEIMENT STATION RECORD. [Vol.35 



manure crop (none of the crops were large) will supply 70 to 80 lbs. of 

 nitrogen per acre, which is equivalent to about 450 to 520 lbs. of nitrate of 



soda." ,. ^ r J 



Lime nitrogen fertilizer experiments in 1915, Ahr {Mitt. Deut. Landio. 

 Gesell., 30 {1915}, No. fS, pp. 732-737).— Sixteen series of experiments, com- 

 paring lime nitrogen with ammonium and nitrate fertilizers when added as a 

 top-dressing to rye and wheat and before seeding to oats, potatoes, and beets 

 in amounts equivalent to 15, 15.5, 20, 22.5, 30, 45, and 60 kg. of nitrogen per 

 hectare (13.35, 13.8, 17.8, 20.025, 26.7, 40.05, and 53.4 lbs. per acre), are reported. 



It was found that with few exceptions the nitrogen additions favorably 

 Influenced the yield. In fourteen of the series ammonium sulphate had in 

 general a considerably more favorable influence than lime nitrogen. Lime 

 nitrogen when added before seeding was, however, slightly more favorable to 

 beets and potatoes than was ammonium sulphate. In one series lime nitrogen 

 when added before seeding gave as good results as ammonium nitrate and better 

 results than any of the other nitrate forms u.sed. The results with lime 

 nitrogen as a top-dressing for potatoes were very poor, and lime nitrogen was 

 much less favorable for beets than was ammonium nitrate. The results as a 

 whole are taken to indicate that the action of nitrogenous fertilizers is influ- 

 enced by local environmental factors, especially soil and climatic conditions 

 and kind of crop grown. 



It was found in further experiments that mixing lime nitrogen with pulver- 

 ized bog iron ore increased the fertilizing action of the lime ntrogen for winter 

 wheat and rye, but not for oats. The results of experiments with a mixture 

 of lime nitrogen with superphosphate were inconclusive. 



Experiment on the effectiveness of some new ammonium salts as com- 

 pared with sodium nitrate, ammonium sulphate, lime nitrog'en, liquid 

 manure nitrogen, and some organic nitrogenous fertilizers, P. Wagneb {Mitt. 

 Deut. Landw. Gesell., SO {1915), No. 47, pp. 114-120, fios. 3).— Pot culture ex- 

 periments on loam and sand soils with sodium nitrate, ammonium sulphate, 

 sodium-ammonium sulphate, ammonium carbonate, ammonium chlorid, blood 

 meal, liquid manure, castor-bean meal, powdered and granulated lime nitrogen, 

 a wool fertilizer, and an organic fertilizer, when added in amounts equivalent 

 to 0.5, 1, and 1.5 gm. per 20 kg. of soil to summer rye, summer wheat, and 

 white mustard, are reported. 



Considering the effectiveness of ammonium sulphate as 100, with reference 

 to both yield and nitrogen utilization, the effectiveness of sodium-ammonium 

 sulphate was 93 for both, of ammonium carbonate 102 for yield and 103 for 

 nitrogen utilization, of ammonium chlorid 104 and 98, of lime nitrogen 104 

 and 105, of blood meal 98 and 100, of liquid manure 91 and 94, of castor-bean 

 meal 72 and 63, of the organic fertilizer 49 and 48, and of wool fertilizer 21 and 

 25. No difference was observed in the results obtained with lime nitrogen of 

 different degrees of fineness. 



Potash supplies during the war {Bd. Agr. and Fisheries [London^, Spec. 

 Leaflet Jf2 {1915), pp. ^).— This leaflet points out briefly the importance of the 

 preservation and use of potash in barnyard manure, crop residues, seaweed, and 

 wood ashes during the coming year, and discusses the liberation of soil potash 

 by liming and applying sodium salts. Suggestions for the treatment of par- 

 ticular crops are given. 



Potash: Review of the present position, A. Bruce {Trap. Agr. [Ceylonl, 45 

 (1915), No. 1, pp. 4-14).— This is a review of the present potash situation, with 

 special reference to its effect on tropical agriculture. A table showing the ash 

 and potash contents of various tropical plants is included. 



