sou.- FEBTILIZERS. 229 



How can we maintain the fertility of our Colorado soils? W. P. Beadden 

 I < Colorado Sta. Bul. 99, pp. 16 ). — The purpose of this bulletin is stated to be "to pre- 

 sent to tlif farmers of Colorado some of the mosl patenl facts relative to the mainte- 

 nance of the productiveness of their lands." It discusses in a brief popular way the 

 origin of Colorado soils, their deficiences and the extent to which they have been 

 ixhausted, and various means of restoring and maintaining fertility, including the use 

 >f commercial fertilizers, barnyard manure, and green manures. 



It is .-tat ril thai tin- soils (if the eastern slope of the Rocky Mountain- in < lolorado 

 are for the mosl pari lighl sandy loams derived from the disintegration of the moun- 

 tain ro,k-. which are essentially granitic in character. They are nol particularly rich 

 in potash and phosphoric acid, bul oearly all of them contain as much as 0.1 percenl of 

 nitrogen, which is considered the standard fora fairly productive soil. The climatic 

 conditions, however, arc uot especially favorable to the formation of humus, the ten- 

 dency being toward a burning up of the organic matter rather than its humifaction. 



Considering the geographical position of the state and its remoteness from supplies 

 of the chemical fertilizers I potash salt.-, nitrate of soda, etc. I, then- is serious doubl 

 w aether these material- can he profitably used for maintaining or increasing the fer- 

 tility of the soils. The use of barnyard manure -- i< one of the mosl important and 

 at the same time available means for the maintenance of the productiveness. , . . 

 The next best method is probably that of green manuring, ami for this purpose we 

 have no better plant than alfalfa." 



Soil fertility, \V. ('. Welborn ([Philippine] />'"/•. Agr. Bul.6,pp. 18). — A popular 

 ili-cussion of means of maintaining soil fertility, with suggestions as to the specific 

 fertilizer requirements of the principal Philippine crops and the need of fertilizer laws 

 in the Philippines. 



Fertilizers registered for sale in Arkansas during- 1905, A. M. Muckenpuss 

 [Arkansas Sta. Bul. 86, />/>. 58-51 (.—Actual and guaranteed analyses of ~'l samples of 

 fertilizers examined by the State chemist are reported. 



Analyses of fertilizers, ( !. A. Goessmanh ( Massachusetts Sta. Bul. 108, pp. 

 This bulletin includes directions for sampling fertilizers; instructions to manufac- 

 turers, agents, etc.; a discussion of trade values of fertilizing ingredients for 1905; 

 and analyses of miscellaneous fertilizing materials, including wood ashes, nitrate of 

 soda, cotton-seed meal, dried blood, sulphate of ammonia, clover roots, potash salts, 

 acid phosphates, lish fertilizers, oyster-shell lime, paper-mill dustings, wool dustings, 

 wool waste, cotton waste, cotton-waste compost, sewage-bed sludge, sewage, sheep 

 manure, tobacco -tern-, tobacco dust, wood charcoal, salt-marsh mud. muck, peat, 

 and soils t IS miscellaneous samples |. 



Analyses of commercial fertilizers and manurial substances, C. A. Gosss- 

 M\w i Massachusetts Sta. />'"/. 104, i>i>- 28). — Analyses are reported of Licensed fertil- 

 izers and miscellaneous fertilizing materials, including wood ashes, potash salts, 

 German peat moss, river mud, wool-mill refuse, charcoal, boneblack, nitrate of soda, 

 cotton-seed meal, barnyard manure, hen manure, and soils | 19 miscellaneous samples). 



Report on official inspection of commercial fertilizers and agricultural 

 chemicals during the season of 1904, C. A. Goess m axx ( Massachusetts Sta. Rpt. 

 1904, pp. 94-108). — The result- of examination- of 525 samples representing 295 

 brands are summarized. Tables show the average composition of the different 

 classes of all fertilizers analyzed, and the maximum, minimum, and average compe- 

 tition of special crop fertilizers. A schedule of trade values of fertilizim: constitu- 

 ents and a list of licensed manufacturers and dealers are given. 



Analyses of miscellaneous fertilizer materials, M. S. McDowell Pennsylva- 

 nia Sta. Rpt. 1904, />/'■ IS4-1S6). — Analyses of the following materials are reported 



and discussed: Muriate of potash, sulphate of potash, kainit, sylvinit. w 1 ashes, 



nitrate of soda, nitrate of potash, sulphate of ammonia, dried blood, ground bone, 



