732 EXPERIMENT STATION RECORD. [Vol.40 



Medium red clover alone, mixtures of medium red clover and timothy, and 

 of timothy, and medium red and alsike clovers are said to have given the 

 heaviest yields per acre in tests of various seedings of grasses and legumes. 

 A large tonnage also resulted from a mixture of meadow fescue and medium 

 red and alsike clovers. 



It is stated that studies of high protein content in corn seem to show that 

 a high protein strain can be immediately isolated by self-fertilization. 



Yields of potatoes amounting to 306, 322, 350, and 266 bu. per acre, re- 

 spectively, were scecured from whole seed tubers weighing 2, 3, and 4 oz., and 

 from 1-oz. cut pieces. The average number of stalks per hill was 3, 3.82, 4.73, 

 and 1.5, respectively. One-ounce seed pieces from the stem, middle, and seed 

 ends resulted in yields of 258, 276, and 294 bu. per acre, respectively. Plant- 

 ing 1-oz. seed pieces of Green Mountain in hills IS in. apart and rows 3 ft. 

 apart resulted in an average of 1.646 stalks per hill and 266 bu. per acre, as 

 compared with 240 bu. from the same sized seed pieces with the stalks 

 thinned to 1 per hill. Green Mountain seed planted two weeks later, owing to 

 wet weather, produced about 100 bu. per acre less. In the later plantings 

 1-, 2-, and 3-oz. cut seed pieces produced 1S3, 22S, and 214 bu. per acre, respec- 

 tively. These results are believed to corroborate the opinion that the size of 

 the seed piece that can be profitably used depends directly upon the fertility 

 and condition of the soil, together with the price of the seed. 



Early Ohio seed potatoes grown on various types of soil and in different 

 parts of the State were planted at University Farm and on the Duluth, Grand 

 Rapids, and Crbokston substations. The tubers produced on University Farm 

 are said to have averaged larger than those grown on the substation farms, 

 and also exhibited large papilla?, small knobs, and numerous scab Injuries. 

 The Duluth tubers had indistinct papilla' and exceptionally smooth skin. The 

 tubers grown at Crookston were the least mature, had a redder skin, and a 

 marked tendency to be elongated and tapering toward the proximal end. The 

 Grand Rapids tubers possessed a more flaky skin than the others and were 

 slightly Infected with Khizoetonia. The Duluth and Grand Rapids tubers 

 retained the shape of the parental stock much better than the others. 



Potato varieties exchanged with the substations mentioned above are said 

 to have shown a marked degree of rejuvenation in one season, although cer- 

 tain varieties required a longer period. Seed potatoes from plants sprayed 



Potato varieties exchanged with the substations mentioned above are said 

 the following season. 



[Report of field crops work at the Crookston substation, 1917], C. G. Ski vn; 

 {Minnesota Sta. Rpt. 191S, pp. 75-78, 79-81).— This describes the progress of 

 work along the same general lines as previously noted (E. S. R., 39, p. 336), 

 embracing variety, cultural, rotation, and fertilizer tests with various farm 

 crops for the year ended June 30, 1918. The precipitation during 1917 is said 

 to have been the lowest recorded during the 37 years that observations have 

 been taken at Crookston, amounting to 9.44 in., as compared with an average 

 precipitation of more than 22 in. The crop season was also 35 days less than 

 the average. 



The highest yielding varieties of wheat, barley, and oats, respectively, were 

 Pentad with 27.7 bu. per acre, Hannchen with 33.3 bu., and Minnesota No. 

 533 with 66.4 bu., as compared with average cheek yields of 18.3, 24.4, and 27.:* 

 bu. per acre, respectively. Minnesota No. 2 rye produced 19.1 bu. per acre and 

 all other varieties an average of 13.S bu. North Dakota No. 155 wilt-resistant 

 flax was highest with a yield of 10.8 bu. per acre, Canadian White held peas 

 were first with 12 bu. 



