/ 



o 



Circular No. 12 



(c) A good supply of decayed organic matter, humus, indicated by a dark 

 color, is essential to the normal New York soil. Stable manure and green 

 manures give this condition. 



(d) Deep, careful plozcing, thorough, clean, lei'el tillage, and the use of 

 the dust mulch on hoed crops are essential. Where these conditions are 

 fully met the use of fertilizers is minimized and often rendered unnecessary. 



The only reliable method to determine the fertilizer needs of a soil is by 

 field plot tests, using different materials in different combinations over 

 several years. 



The follo\\'ing books will be found to contain much useful infonnation 

 for the average farmer, on the character and composition of soils, ferti- 

 lizers, and manures, and on the handling of the land: 



The Soil. S. W. Fletcher. Doubleday, Page & Co. $2.00. 



Soil Fertility and Permanent Agriculture C. G. Hopkins. Ginn & Co. 



S2.25. 

 First Principles of Soil Fertility. Alfred M\-ian. Orange Judd Company. 



$1.00. 



