422 Report of the Department of Field Crops of the 



Potash Test Formula No. 4. 



This formula is identical with the L. I. Formula and need not 

 be restated. The ingredients and composition of the mixture are 

 similar to No. 4 under the head of L. I. Formula. 



GENERAL COMPOSITION. 



It was intended that approximately one-fourth of the nitrogen 

 furnished by these mixtures should be nitric, and three-fourths 

 organic nitrogen. The manufacturers who mixed the fertilizer 

 were also instructed that the phosphoric acid should be as largely 

 soluble as possible. The analyses of the four mixtures showed 

 that these conditions were secured. 



THE AREA AND ARRANGEMENT OF PLATS. 



The total area under experimental treatment is twelve acres, 

 divided into 120 plats of one-tenth acre in size. 



This area is distributed equally on four farms, the arrangement 

 of the plats and amounts and kinds of fertilizers being the same 

 in each case. 



Fertilizers Applied on Plats. 



Potato Formula. 



Plat No. 1, no fertilizer. 



Plat No. 2, 500 lbs., Mixture No. 1. 



Plat No. 3, 1,000 lbs., Mixture No. 1. 



Plat No. 4, 1,500 lbs., Mixture No. 1. 



Plat No. 5, 2,000 lbs., Mixture No. 1. 



Plat No. 6, no fertilizer. 



Plat No. 7, 500 lbs., Mixture No. 2. 



Plat No. 8, 1,000 lbs., Mixture No. 2. 



Plat No. 9, 1,500 lbs., Mixture No. 2. 



Plat No. 10, 2,000 lbs., Mixture No. 2. 



L. I. Formula. 



Plat No. 11, no fertilizer. 



Plat No. 12, 500 lbs., Mixture No. 3. 



Plat No. 13, 1,000 lbs., Mixture No. 3. 



Plat No. 14, 1,500 lbs., Mixture No. 3. 



Plat No. 15, 2,000 lbs., Mixture No. 3. 



Plat No. 16, no fertilizer. 



Plat No. 17, 500 lbs., Mixture No. 4. 



Plat No. 18, 1,000 lbs., Mixture No. 4. 



Plat No. 19, 1,500 lbs., Mixture No. 4. 



Plat No. 20. 2,000 lbs., Mixture No. 4. 



Plats 21 and 26. 

 Plats 22 and 27. 

 Plats 23 and 28. 

 Plats 24 and 29. 

 Plats 25 and 30. 



Potash Test Formulas. 



No fertilizer. 

 Formula No. 1. 

 Formula No. 2. 

 Formula No. 3. 

 Formula No. 4. 



