1916] FIELD CEOPS. 229 



showed that clean summer fallow had not been very profitable, especially with 

 oats and barley. 



Sixth annual report of the Williston substation for the year 1913, E. G. 

 ScHOLLAXDEB {North Dakota Sta., Rpt. Williston Suhsta., 1913, pp. 48, figs. Jjf). — 

 The results are reported of tests conducted in 1913, mainly, with varieties of 

 spring and winter wheat, oats, barley, emmer, spelt, rye, millet, potatoes, sugar 

 beets, and alfalfa. Cultural exi^eriments with wheat, oats, and potatoes, prin- 

 cipally with reference to rate and time of seeding and planting, are also reported, 

 together with a study of hardiness in different sptecies and varieties of medicago, 

 including alfalfa, and meteorological observations at Williston, N. Dak., during 

 1913 as to temperature, precipitation, and evaporation. 



[Work with field crops in 1915] (Rhode Island .^ta. Rpt. 191-5, pp. 26. 21). — 

 Tests of varieties of potatoes showed that Clyde was not superior to Norcross 

 and that Enohla was as early as Irish Cobbler and more productive. Norcross 

 potatoes grown at the station did not prove as good for seed as those grown 

 in Jilaine, and nothing was gained by selecting the seed from the most productive 

 hills, although potatoes selected for two years were superior to unselected 

 stock. The use of 2-oz. potatoes for seed planted 18 in. apart in the row gave 

 about the same yield as planting 1-oz. pieces 9 in. apart but the yields decreased 

 successively when ounce pieces were dropped 12 and 15 in. apart. 



Among several varieties of sweet corn planted April 28, a si)ecial strain of 

 Early Cory produced the first pickings August 6 and 9 and yielded about 50 

 per cent more than commercial seed. The number of dozen ears secured on a 

 given area by the different varieties on and before August 13 was as follows: 

 Golden Bantam, 8 ; Crosby Early. 41 ; Quincy Market, 75 ; Early Cory, 99 : Early 

 Cory, special strain, 129. Experiments vn.th. three strains of White Cap corn 

 showed no decided difference in yield between the three strains and three crosses 

 from the same. 



A yield of 30 bu. of Red Chaff winter wheat was recorded. Mammoth White 

 Rye from Canada was not found superior to Excelsior. Sudan grass planted 

 May 11 in drills 2 ft. apart grew fairly well on acid soil, and when allowed to 

 stand until September 3 yielded 11.5 tons of green material. Mixing a liberal 

 amount of hydrated or slaked lime with the surface .soil and subsoil gave no 

 larger yields of alfalfa than where such lime was mixed only with the surface soU. 

 Alfalfa cut on June 1. July 19. and September 14 yielded a total of 4.24 tons of 

 hay per acre as compared with 4.5 tons cut on June 24, August 14, and Septem- 

 ber 14. A mixture of orchard grass and alfalfa seeded in 1912 yielded 4.2 tons 

 of hay as compared with 4.34 for alfalfa alone. 



Crop rotations for upper Wisconsin, E. J. Delwiche (Wisconsin Sta. Bui. 

 222 (1916), 2. ed., pp. 20, figs. 16). — The first edition of this bulletin has been 

 noted (E. S. R., 28, p. 40). The additional statements presented point out that 

 pasturing the first crop of clover for about two weeks in early spring, or until 

 June 10, retards the time of cutting but without greatly affecting the yield, that 

 in a 3-year rotation for dairy farms manure may be applied on new clover fields 

 in the fall or winter, and that in other rotations corn and potatoes .should not 

 follow each other. 



Experiments with com, C. F. Noix (Pennsylvania Sta. Bui. 1S9 (1916), pp. 

 23, fig. 1). — These experiments included trials of varieties grown for grain 

 and for silage, tests of selection and care of seed, and breeding work, mainly 

 ear-to-row selection, inbreeding and crossing inbred strains, and crossing varie- 

 ties. The results of the variety tests are regarded as applicable only to sec- 

 tions of the State with conditions similar to those existing at the station. 



For central Pennsylvania, the northern counties with an altitude not quite 

 so great as that of the station, and for the higher altitudes of the southern 



