FERTILIZERS. 



328 



are reported. These show that in every case there was a decided gain 

 in weight of dr}' matter due to application of the nitrogenous fertilizers. 

 There was also a considera])le but more varial)le gain of nitrogen. The 

 comparative availabilit}^ of the nitrogen in the different forms of the 

 manure as shown by these experiments was as follows: 



Comparative availability of nitrogen in coiu manure. 



Character of manure. 



Nitrogen 

 recovered. 



Increase in 

 dry matter. 



Increase in 

 dry matter 

 on basis of 

 nitrogen in 

 unleaehed 

 manures. 



Fresh manures: 



Solid 



Solid and liquid 

 Leached manures: 



Solid 



Solid and liquid 



Per cent. 

 7.44 

 22.04 



16.80 

 22. 36 



Per cent. 

 15.4 

 69.4 



33.0 

 36.1 



23. 2 

 36.1 



"The yields, when the various forms of yard manure are appUed, together with 

 nitrates in different quantities as well as with ammonia and dried blood, show one 

 thing very elearly, viz, that the total recovery of nitrogen is in every case greater 

 where the different materials are used together than when they are used singly. . . . 



"It is also shown that the losses are not very different when the manure is used 

 with the small or the large amount of nitrate of soda, which would seem to argue 

 that the nitrogen was not dissipated by denitrification, but that the losses were due 

 to other causes. ' ' 



The relative availability of the nitrogen in the artificial forms and in 

 the various kinds of cow manure, based iq)on recovery of nitrogen in 

 the crop, is shown in the following table: 



Relative availabilitj/ af nitrdf/ni. in different forrii!^. 



Per cent. 



Nitrate of soda , _ 100 



Sulphate of ammonia 99. 5 



Dried blood 95. 4 



Solid manure, fresh 16. 76 



Solid manure, leached 37. 86 



Solid and liquid manitre, fresh 49. 66 



Solid and liquid manure, leached 50. 38 



A summary is given of the results of experiments with nitrogenous 

 fertilizers in difierent parts of New Jersey, which have already been 

 publish(Ml in a bulletin of the station (E. S. R.. 11, pp. l-8!». 14(1.144). 



Experiments on the fertilizing effect of the phosphoric acid of 

 bone meal, O. Kellner and O. Bottcher {Bent. Lanchv. Presse, 27 

 {1000), No. 52, pj). 665, 666; ahs. in Chew. Ztg., 21^ {1000), No. 82, 

 Reperf.^ p. 22). — This Is an account of experiments with summer rye 

 grown in pots containing 6 kg. of a moderately compact loam soil with 

 l.t>l per cent of humus and a very small amount of lime. Ten samples 

 of partly degelatinized })one meal were compared in these experiments 

 with superphosphate and Thomas slag with and without the addition of 

 lime (carbonate). The results indicate that on soils which are not 



