SOIL SESSION. 



IJ9 



Value of increase and cost of treatment 



1903. 



1904. 



1905. 



Total 



for 3 



years. 



Cost 



for 3 



years. 



For legume 



For lime 



For phosphorus 

 For potassium . 



$6 30 



3 50 



12 10 

 8 40 

 2 10 



$3 50 

 4 20 

 8 40 

 2 80 



$3 50 

 6 £0 



23 10 

 2 80 



$1 50 

 7 50* 

 7 50 



*In steamed bone-meal. 



Notice now, if you will, the effect of treatment on the gray silt loam. 

 (See plates 4 and 5.) The particular field, the results of which are 

 given here, is located at Odin. A four-year rotation of corn, oats, wheat 

 and cowpeas has been followed. For legume treatment catch crops of 

 cowpeas are seeded in the corn at the last cultivation and after the oats 

 and wheat, to be plowed under for the benefit of the land. It should be 

 slated that 1903 was a very poor wheat year, but notwithstanding that 



Plate 4.— Wheat Crop with Legume and Lime Treatment. 



fact, phosphorus increased the yield nine bushels. In 1904, and again in 

 1905, where lime had been applied to destroy the sourness in this soil, 

 legumes did better, and there was more organic matter to plow under, 

 and the increased yield shows the effect. But phosphorus added to this 

 treatment gave a very decided additional increase (12 bushels in 1904 

 and 12 bushels in 1905). 



A-9 



