FIELD CROPS. 227 



alone. The nitrate of soda plat is undergoing a gradual diminution in yield. 

 Ammonia salts applied with mineral manui-es gave a higher yield than nitrate 

 of soda, but when the heavier dressings of the salts were used the ammonia 

 salts showed the same signs of failure as they did when applied alone and in 

 quantities furnishing 50 lbs. of ammonia per acre. 



The rape cake plat did not give as good yield as the barnyard manure plat. 

 Ten cvrt. of lime per acre gave a good increase in yield, while 5 cwt. effected n<» 

 change, and applications of 1 and 2 tons per acr^ seemed to retard the cro]). 



In 190(!. the rape calve plat yielded :^4.5 bu. per acre, as compared with Ki.'J 

 bu. for the barnyard manure plat. Rust was most marked on the nitrate of soda 

 plats. The unmanured plat yielded 11.5 bu. per acre, and the plat receiving 

 nitrate of soda with minerals produced 35.2 bu., the highest yield secured. The 

 plat receiving ammonia salts and minerals, including 10 cwt. of lime, gave a yield 

 of 34.7 bu. per acre. Ammonia salts alone, in quantities fiu'nishing 50 lbs. of 

 ammonia per acre, produced only 3.5 bu. i)er acre, as compared with 2<i.l bu. 

 for the plat receiving 2 tons of lime in 1897. The results of this year also 

 indicated that the influence of a dressing of 2 tons of lime per acre will last 

 with cereals for at least 9 years. 



In both years the crop grown with nitrate of soda was characterized by a 

 large quantity of screenings and a low bushel weight. Rape cake and ammonia 

 salts with lime gave the best weight per bushel, lime seeming generally to be 

 beneficial in this respect. 



In 1905, in the barley-growing tests, the unmanured plat yielded 19.35 bu. 

 per acre, while barnyard manure produced 42.G bu., and a dressing of minerals, 

 ammonia salts, and lime 40.6 bu. Mineral manures alone gave 23.3 bu. per acre, 

 while ammonia salts alone gave no crop, and ammonia salts with lime but no 

 minerals 23.7 bu. per acre. Nitrate of soda with minerals gave a yield of 30 bu., 

 while ammonia salts with minerals and lime gave 40.6 bu. With rape cake, a 

 yield of 34 bu. was secured. Barnyard manure excelled in yield and quality, 

 while nitrate of soda produced the poorest quality of grain. 



In 1906 the crop of barley was a distinctly heavy one, the unmanured plat 

 yielding 15 bu., the plat receiving minerals alone 18.8 bu., barnyard manure 45.6 

 bu., rape cake 45.8 bu., nitrate of soda and minerals 47.5 bu., and ammonia salts 

 with minerals, including lime, 44.3 bu. per acre. Nitrate of soda alone gave a 

 yield of 36.3 bu., and a heavy dressing of this substance with minerals 60.8 

 bu. of grain and 42 cwt. of straw per acre. In the case of barley, the continuous 

 use of nitrate of soda has apparently not been detrimental. The plats receiving 

 ammonia salts alone, or ammonia salts and minerals without lime, gave practi- 

 cally no crop at all, but where 5 cwt. of lime were given, 11.6 bu., where 1 ton 

 was used, 3.''>.9 bu., and where 2 tons were applied last in 1897 to 2 different 

 plats, 25.4 bu. and 44.3 bu. were secured. The further use of 2 tons of lime in 

 1905 resulted in an additional increase of 13 bu., though no minerals had been 

 put on. Nitrate of soda reduced the quality slightly this season. The best 

 weights per bushel were obtained from the barnyard manure plat and the plats 

 fertilized with ammonia salts and minerals, including lime. 



In a rotation experiment, sheep were fed per acre 12 tons of swedes, 4* cwt. 

 of clover hay chaff, and 920 lbs. of decorticated cotton cake, or the same quantity 

 of maize meal. The test was conducted on 4 plats, on the first of which the 

 swedes were fed off with decorticated cotton cake, on the second with maize 

 meal, and on the other 2 without cake or corn. The first plat produced 8 bu. 

 more barley and 7 cwt. more straw than the second plat, which yielded prac- 

 tically as much grain as plat 3, but 2 cwt. more straw per acre. 



In another rotation test, in which kohl-rabi were grown instead of swedes, 

 the decorticated cotton cake plat produced 6.4 bu more than the check plats, 



