FORTY-SECOND ANNUAL CONVENTION 43 



In 19 ID we had our first corn crop on that field. The 

 untreated land produced 24.1 bushels of corn to the acre on one 

 plot, 24.9 on the second, and 26.8 on the third. Those are 

 three plots that had no treatment. They are nearly uniform — ■ 

 about 25 bushels to the acre — it was a good corn year. Where 

 we put on ground limestone we got 40.1 bushels of corn; ground 

 limestone and green manure, 42.8 bushels; and when we added 

 phosphorus, 44.5 bushels. 



The next year, 191 1, we grew corn on a different field 

 that we had different kinds of treatment on. The untreated land 

 produced 28 bushels on one plot, 24.9 bushels on the second, and 

 17.8 on the third, thus showing variation, but we had a-i average 

 of 25 bushels the same as before. Now we got our manure 

 for the first treatment from the 1910 crops and instead of 25 

 bushels on untreated land, we got 41 bushels of corn on the 

 manured land; manure and limestone produced 45.8 bushels of 

 corn, and with the phosphorus added, 46.7 bushels of corn. 

 Where we had the crop residues turned under, clover, straw, 

 stalks, etc. ,and limestone applied, we got 36.8 bushels. 



The next year, 1912, we had corn on still a different held 

 and the first untreated plot produced 20.5 bushels of corn; 

 with farm manure, 36.5 bushels; farm manure and limestone, 

 55.1 bushels, and when we added phosphorus, we got 58.9 

 bushels, no increase. We usually get a larger increase when 

 we add phosphorus with clover and corn stalks than with 

 manure. If we sell the grain, the wheat and corn from the 

 farm and only return the residues, we don't get back as much 

 phosphorus as we do with the manure. Another untreated 

 plot in the middle of the field produced 20.4 bushels of corn ; 

 where we had turned under the crop residues the yield was ^g.g ; 

 crop residues with limestone, 45.2 bushels, and where we added 

 phosphorus with the limestone and residues, 55.1 bushels of 

 corn. That is the third year' and with corn on the third 

 field. 



1913. — The first untreated plot, 5.7 busntls; with manure, 

 we get 12.9; manure and limestone, 17.2; maaure, limestone and 

 phosphorus, 17.1 bushels. The next plot yielded 4.5 bushels 

 untreated; 9.4 with residues; 17.5 with residues and limestone; 



