860 EXPERIMENT STATION RECORD. 



FERTILIZERS. 



A treatise on manures, A. l\. GiuKirriis {London: U'liitldLrr ii- Co.; New York, 

 1903, S. I'd., rev. and ml., }>p. XVI-'r4-'i-h l''""- -h .fiil^- -'")■ 



Green manuring- on the better class of soils, W. .Schneidkw ind {Dad. Landw. 

 Piruxe, 31 [1904), Xo. 7, pp. 4J, 40). — A l)rief iiccount <if the results of experiments 

 uuuk' at Lauc-listiiflt. 



The preparation and use in agriculture of lime nitrogen, M. Gkkl.vcii [Mill. 

 Deut. Landw. (kselL, 10 {1004), Xo. S, pp. 45, 40).—A brief account is given of 

 methods of preparing this substance and of field experiments to test its fertilizing value. 

 Earlier experiments by Wagner and the author (E. S. R., 15, p. 2.5), showing that 

 tlie availability of this form of nitrogen is very nearly the same as that of nitrogen in 

 form of ammonia salts and nitrate, are referred to. It is pointe<l out, however, that 

 more recent farm trials have not shown so high a degree of availability, being on an 

 average only about three- fourths of that of nitrogen in form of nitrate. It was found 

 also that later applications were more effective than earlier applications, and that on 

 certain soils (for example, moor soils) the lime nitrogen had an injurious effect, due, 

 it is suggested, to the formation of dicyandiamid, which is ajiparently poisonous to 

 vegetation. 



Sulphate of ammonia or nitrate of soda? Lilienth.\l {Fuldinr/s Landw. Zty., 

 53 {1004), Xo. 4, pp. I.:!0-lo4). — Comparative tests with jjotatoes on light sandy soil 

 of nitrate of soda and sulphate of ammonia, with and without the addition of lime, 

 are reported. The results with the sulphate were equal to and in some cases superior 

 to those with the nitrate. 



Under w^hat conditions and by ■what means may ammoniacal nitrogen be 

 made most effective ? 1'. Wagnek {Jahrh. Deut. Landw. GeselL, 18 {1003), pp. 

 37-40). — A general discussion of the fertilizing value of the nitrogen of aumionium 

 salts under various conditions. 



Pot experiments on the influence of liming and marling on the yield of 

 serradella, 1\. Ulhricht {Londir. VerK. Stat., 30 {1004), Xo. 5-6, pj). 4,.'.5-43J, 

 pis. 2). — The method used in experiments during 1900 and 1901 was tlie same as that 

 followed in earlier experiments (E. S. R., 14, p. 129). Burnt lime and niagnesite, 

 marl, and ground limestone were experimented with. Ajiplications of lime in all 

 forms decreased the yield, showing that the growth of serradella, like that of lujiines, 

 is injuriously affected by this substance. The addition of magnesia to the lime still 

 further decreased the yield. 



On precipitated superphosphate as a substitute for Thomas slag, A. E.mmek- 

 LiNG {Deut. Landw. I'resse, 31 {1904), Xo. 14, JU'- l'J''\ lOS) . — Yari<jus methods of 

 preparing precipitated phosphate by mixing superphosphate with calcium carljonate 

 (chalk) and combining this mixture with jiotash and nitrogen salts are described. 

 Analyses and field experiments with the various mixtures are reported. The results 

 show that very effective fertilizers may be jjrepared in this way. 



The use of crude potash salts in German agriculture in 1898 and 1902, 

 G. SiEMssEN (Arh. Deut. Landw. GeselL, 1904, Xo. SS, pp. 24, map i).— Detailed sta- 

 tistics are given. The total amount used in 1898 is reported to l)e 7,604,754 kg. 

 (8,365.23 tons); in 1902, 10,788,625 kg. (11,867.49 tons). 



Progress in the potash industry in 1903, M. Hacjen {CJiein. Ztg., JS {1004), 

 No. IS, pp. 206-JOO). — A brief review with referencesto literature. 



FIELD CROPS. 



Field experiments, F. C. Burtis and L. A. INlooRuorsE {OUalioma Sta. Bui. 01, 

 pp. 22).— The results obtained in 1900 with sugar beets and mangels showed the 

 value of soaking beet and mangel seed before planting. Two varieties each of sugar 



