MAXriCK. YlKI.ii ANJ) SOLI l:I-E SALTS IN SOILS. 



The increase in total dry matter was: 



The increase of yield of dry matter in the form of shelled 

 corn is 



37.01 X 36 = 2072.56 Ibs. 



This leaves the dry matter in the form of stalks, leaves and 

 cobs 



3993.50 - 2072.56 = 1920.94 Ibs. 



so that the gain here is at the rate of 64.03 Ibs. of dry matter 

 per ton of manure applied. It thus appears that the major 

 effect of the stable manure has been in the direction of increas- 

 ing grain rather than stalk, leaves and cob, the ratio being 



69.10 of kernel to 64.03 of stalk, leaves and cob. 



It is not an infrequent experience that the addition of potash 

 to soils increases the yield of shelled corn more than it ' does 

 stalk and foliage. It ha,s been shown, in Bulletin "C", also, that 

 the recovered amounts of potash bore a close relation to the 

 yields of shelled corn from these soils and the relation here 

 pointed out is quite in accord with the view that the larger 

 amounts of soluble potash shown to be present in the soils giv- 

 ing the largest yields has been an influential factor in deter- 

 mining those differences of yield. 



At various times during the season photographs were taken 

 of both corn and potatoes on the same date for all of the soil 

 types. Some of these photographs are here reproduced to ex- 

 actly the same scale, so that they give to the eye a quantitative 

 expression of -the differences in growth as the observer would 

 recognize them. There have been reproduced on pages 10, 11, 

 12 and 13 photographs of corn taken on August 14 at the four 

 stations which represent the appearance of the corn upon four 

 of the soil types where 15 tons of stable manure had been ap- 



