MAM RK. YIKI.I) AND SOLUBLE SALTS IN SOILS. 61 



effort lias been made to apply a moderate amount of manure, 

 by distributing it unevenly over the surface. When manure is 

 applied directly beneath t % he row, in the bottom of a furrow, 

 much greater care is required not to get results which, in effect, 

 so far as the relations of manure to soil are concerned, are not 

 equivalent 'to 30 to 50 tons per acre. In such cases, not only 

 may normal nitrification be interfered with, but concentration 

 of the plant roots within a small volume of soil where the plant 

 food has been made overabundant may result in such a defi- 

 ciency of soil moisture that, for this reason alone, the manure 

 becomes comparatively inefficient. 



