274 ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



LICENSED COMMERCIAL FERTILIZERS AND FEEDING STUFFS. 



By F. W. Woll and Geo. A. Olson, Wisconsin Experiment Station. 



This bulletin is published in accordance with Wisconsin 

 statutes of 1898, sec. 1494d, and gives the results of analyses 

 of the commercial fertilizers licensed for sale in this state dur- 

 ing the current calendar year. Under Chap. 377, laws of 1901, 

 commercial concentrated feeding stuffs have also been licensed 

 for sale in the state during the present year, and a list of feed- 

 stuffs for which licenses have been taken out by the manufact- 

 urers or agents up to April 1, 1907, are given in the second 

 part of this bulletin. Samples of concentrated feeding stuffs 

 sold by feed dealers in different parts of the state have been 

 collected during the past three months by authorized agents of 

 the Station; these examples are now being subjected to chemi- 

 cal analysis and microscopic examination in our laboratory, 

 and the results obtained, with the analyses of other samples 

 of feeding stuffs, collected during the year, will be given in 

 the regular feed bulletin published toward the end of the year. 



A^LIcensed Commercial Fertilizers. 



The general subject of commercial fertilizers has been fre- 

 quently discussed in earlier publications of our Station, and 

 the explanations there given as to the main principles govern- 

 ing the application of fertilizers, will doubtless be of service 

 to those who are not already familiar with this subject. It 

 has been thought well to repeat in this place some brief ex- 

 planatory remarks concerning certain technical terms met with 

 in statements of fertilizer analyses, and to say a few words 

 about the fertilizing elements on which we have to depend for 

 maintaining or restoring the fertility of our land. 



The main fertilizing ingredients which it may be necessary 

 to supply in growing crops under the conditions present in 

 this state are nitrogen, phosphoric acid, potash and lime. 



