FERTILIZERS. 39 



Comparative tests during 1893 and 1894 of sulphate of am- 

 monia and nitrate of soda, 11. Gkahl (Juhrh. dent, landic. Ges., 10 

 [1895)^ pp. 18:2— 187). — A brief review i >s given of experiments by jNI a rcker, 

 whicli indicated that with small applications nitrate of soda and sul- 

 phate of amnioniai were about equally effective but with larger applica- 

 tions the nitrate was superior to the sulphate; by Wagner, which 

 indicated that the efiectiveness of the nitrogen in sulphate of ammonia 

 as compared Tvith that in nitrate of soda was as 90 : 100 ; and by Schultz- 

 Lupitz in the summer of 1890, which showed that the effectiveness of 

 the nitrogen in botli nitrate of soda and sulphate of ammonia Avas 

 increased by the application of lime, the benefit being more marked in 

 the case of the latter. 



The experiments reported in this article were carried out on 12 ten- 

 are (119. G sq. yds., or nearly | acre) i^Iats, to each of which Avere applied 

 a basal fertilizer of 60 kg. (132 lbs.) of Thomas slag and 80 kg. (ITGlbs.) 

 of kainit. Two plats received in addition 20 kg. (44 lbs.) of nitrate of 

 soda; 2 plats, 1") kg. (33 lbs.) of sulphate of ammonia; 2 plats, 200 kg. 

 (440 lbs.) of lime in addition to 20 kg. of nitrate of soda; and 2 plats 

 the same amount of lime in addition to 15 kg. of sulphate of ammonia; 

 while 2 plats received lime without nitrogen. Crops of wheat and rye 

 were raised on these plats during both 1893 and 1894. 



The yields of grain and straw are tabulated in detail. The results in 

 1893 are too variable to admit of definite conclusions. Those obtained 

 in 1894 indicate that the relation between the effectiveness of nitrogen 

 in nitrate of soda and sulphate of ammonia is as 100 : 93 as regards ])ro- 

 duction of grain and 100 : 95 as regards production of straw. The 

 addition of lime increased the effectiveness of the nitrate of soda 8 

 I)er cent and the sulphate of ammonia 4J per cent, so that in this 

 case the relation between the effectiveness of the 2 forms of nitrogen 

 was the same as that reported by Wagner, namely, 100 : 90. 



Pot experiments "with refuse lime from beet-sugar factories, 

 G. Faye {Ugcslr. Landm.^ 11 [lsO(i),p. 138). — Experiments were made 

 with oats grown in pots holding about 11 lbs. of soil. The soils used 

 were different mixtures of (1) garden soil and washed sand; (2) garden 

 soil and heavy clay; and (3) clay, sand, and refuse lime from beet-sugar 

 factories. Three series of exiieriments with 9 or 10 pots in each were 

 conducted. The addition of sand to the garden soil increased the yield 

 of oats, the highest yield (at the rate of 12,944 lbs. of grain, roots, and 

 straw per acre) being obtained with a mixture of 7 parts of sand and 

 3 parts of garden soil. The pots to which refuse lime was added 

 showed a very marked increase in tlie yields obtained; the mixture of 

 3i parts of clay, 3i parts of sand, and 3 parts of lime yielded at the 

 rate of 13,895 lbs. of total crop per acre (4,520 lbs. of grain and 9,375 

 lbs. of roots and straw), against a total yield of 5,673 lbs. (1,153 lbs. 

 of grain and 4,520 lbs. of roots and straw) from a mixture of 4f^ parts 

 clay, 4| parts sand, and h part of refuse lime. — f. \v. woll. 



