422 Report oF THE DEPARTMENT OF FIELD CROPS OF THE 
PotasH Test FormuLta 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. L. I. Formula. 
Plat No. 1, no fertilizer. Plat No. 11, no fertilizer. 
Plat No. 2, 500lbs., Mixture No.1. Plat No.12, 500 1bs., Mixture No. 3. 
Plat No. 3, 1,000 lbs., Mixture No.1. Plat No. 18, 1,000 Ibs., Mixture No. 3. 
Plat No. 4, 1,500 lbs., Mixture No.1. Plat No. 14, 1,500 lbs., Mixture No. 3. 
Plat No. 5, 2,000 lbs., Mixture No.1. Plat No. 15, 2,000 lbs., Mixture No. 3. 
Plat No. 6, no fertilizer. Plat No. 16, no fertilizer. 
Plat No. 7, 5001bs., Mixture No.2. Plat No.17, 500J]bs., Mixture No. 4. 
Plat No. 8, 1,000 lbs., Mixture No. 2. Plat No. 18, 1,000 lbs., Mixture No. 4. 
Plat No. 9, 1,500 lbs., Mixture No.2. Plat No. 19, 1,500 lbs., Mixture No. 4. 
Plat No. 10, 2,000 lbs., Mixture No. 2. Plat No. 20, 2,000 lbs., Mixture No. 4. 
Potash Test Formulas. 
Plats 21 and 26. No fertilizer. 
Plats 22 and 27. , Formula No. 1. 
Plats 23 and 28. Formula No. 2. ipod 
Plats 24 and 29. Formula No. 3. eee 
Plats 25 and 30. Formula No. 4. 2S 
