BuBEAXJ OF Ageioultube. 167 



ments are not of practical application ia farming, al- 

 thougli they furnish valuable scientific data. 



The results of these older experiments are valuable 

 in showing that on poorly drained "crawfishy" soUs 

 potash is profitable. However, such soils form a, re- 

 stricted area. On soils of this nature tile drainage 

 would no doubt render the use of potash unnecessary, 

 besides greatly improving them in other ways. 



At the time the above mentioned results were ob- 

 tained the Experiment Station conducted ten co-opera- 

 tive experiments on com with farmers living chiefly in 

 the western part of the State. An average of all these 

 experiments shows the following yields : 



Nitrogen and potash 40.1 bus. per acre 



Nitrogen and acid phosphate 44.7 bus. per acre 



Nitrogen, acid phosphate and potash 43.6 bus. per acre 

 (See annual report for 1890.) -^ 



The results on the new experiment fields in the 

 western part of the State tend in-the same direction. The 

 fields have been in operation only two years, both of 

 which have been unusually dry. The soils of all these 

 fields are badly worn and quite deficient in organic mat- 

 ter. While it would not be safe to base final conclusions 

 upon them, the results from such crops as have not been 

 severely affected by the dry weather show decided re- 

 sults from acid phosphate and rock phosphate, while pot- 

 ash has shown little or no results. 



At Greenville* on rather poorly drained soil on one 

 wheat crop (1914) potash treatment, as compared with 

 plots similarly treated except for potash, gave an aver- 

 age increase of 1 bu. per acre, while acid phosphate gave 

 an increase of 3.7 bus. per acre. 



Limestone, acid phosphate and potash gave 2,955 

 lbs. of clover hay per acre (1914) while limestone and 

 acid phosphate gave 2,800 lbs. Yet this soU is quite de- 

 ficient in organic matter. Clover absolutely faUed where 

 limestone and potash were used without phosphate. 



*These experiments and all others cited will be given In detail In a 

 bulletin to be issued later. They are used here as a basis for a state- 

 ment of the principles of soil fertility which the Experiment Station Is 

 teaching in the State. 



