356 EXPERIMENT STATION RECORD. 



91 lbs. in the yield of hay from medium red clover and from a mixed crop of clover 

 and timothy. 



Red clover also gave promise of good seed production, while clover from southern- 

 grown seed or from most of the foreign sources was less satisfactory. Red clover 

 alone and grown with timothy as a mixed hay crop gave in 10 trials an average 

 yield of 3,376 lbs. of hay per acre. The average yield of hay from Mammoth clover 

 for 2 years was 3,635 lbs. 



Notes are given on trials with alsike and white clover, berseem, and melilotus. 

 Alsike proved more resistant to the winter than Mammoth clover. 



Corn. Field tests, J. N. Harper {Kentucky Sta. Bui. 118, pp. 19, pis. 13). — The 

 results with 15 varieties of corn grown in 1903 and 1904 are reported. 



With a few exceptions, the same varieties were grown each year. In 1903 the 

 yields ranged from 27.9 bu. per acre for Iowa Silver Mine, to 35.7 bu. for Boone 

 County White obtained from Indiana. Boone County White from Tennessee yielded 

 33.5 l)ii. per acre. Cocke Prolific, which stood second in yield, and Mosby Prolific 

 ranking next to the lowest, were the latest varieties, ripening September 28, while 

 Iowa Silver Mine was ripe September 10. Mosby Prolific led in the yield of fodder 

 with 5,994 lbs. per acre. 



In 1904 Champion White Pearl stood last with a yield of 34.6 bu. per acre, and 

 Boone County White from Indiana first, with 50.6 bu. Boone County White from 

 Tennessee produced 46.7 bu. per acre this season. Champion White Pearl, Iowa 

 Silver Mine, Riley Favorite, and Learning Yellow began to tassel July 12, while 

 Mosby Prolific, Sanders Improved, Cocke Prolific, and Hannah did not begin to 

 tassel until July 23, and Roseland White not until July 27. In yield of fodder Rose- 

 land White, which stood second in yield of grain, ranked first with 4,222 lbs. per 

 acre, being followed by Mosby Prolific with 4,171 lbs. A general discussion is given 

 on the culture of corn and the different varieties tested are described. 



Experiment station work in corn culture, J. I. Schulte (U. S. Dept. Agr., 

 ({flier Eocpt. Stas. Rpt. 1904, pp. 493-544)- — A summary of experiments in corn cul- 

 ture by the different experiment stations of the country. 



Soil improvement for the Illinois corn belt, C. G. Hopkins (Illinois Sta. 

 ( ire. 96, pp. 16, Jigs. 5) . — The experiments reported were conducted on a dark-brown 

 silt-loam prairie soil, which had been in pasture from 1876 to 1894, and in corn from 

 1895 to 1897. The land had been divided into 7 strips or series of 10 one-tenth -acre 

 plats each, and the 3 series numbered 100, 200, and 300 were irregularly cropped 

 but chiefly with clover, oats, and cowpeas, from 1898 to 1900, while the other series 

 continued in corn. 



The following systems of cropping were begun in 1901: A 3-year rotation of corn, 

 oats, and clover on series 100, 200, and 300; a 2-year rotation of corn and oats on 

 series 400 and 500; and corn only on series 600 and 700. The different plats receive 

 different fertilizer treatment. Lime is given in the form of ground limestone at the 

 rate of 2,000 lbs. per acre once every 6 years. Nitrogen in the form of dried blood is 

 applied annually to certain plats in series 600 and 700 at the rate of 100 lbs. per acre. 



On the series 100 to 500, nitrogen is supplied only by growing leguminous crops or 

 catch crops, or by the use of barnyard manure. To supply phosphorus 600 lbs. of 

 steamed bone meal is given once in 3 years in the 3-year rotation, and 400 lbs. every 

 2 years in the 2-year rotation and also in the continuous corn series. This furnishes 

 annually 25 lbs. of phosphorus per acre. On some plats an equal money value of 

 rock phosphate is substituted for the bone meal. Potassium sulphate or chlorid is 

 given in quantities supplying 40 lbs. of potassium per acre each year. 



The tabulated results show that, in 1904, 4 duplicate plats in the 3-year rotation 

 gave an average increase of 31.5 bu. per acre over the corresponding plats in the 

 2-year series. On the plats growing corn continuously lime produced a gain of 5 bu. 

 per acre, lime and nitrogen of only 4 bu., but lime, nitrogen, and phosphorus a gain 



