228 EXPERIMENT STATION EECOED. [Vol.37 



the best early white potato tested. Carmen No. 1, Green Mountain, and Carmen 

 No. 3 are considered the best late varieties. In cultural tests to determine the 

 size of seed pieces, the double eye and quarter sizes have given the highest 

 yields per pound of seed. A planting rate of 16 bu. per acre gave an average 

 yield of 140.25 bu. as compared with a yield of 78.26 bu. from a 10-bu. planting 

 rate. Hill-selected seed gave an average yield of 184.92 bu. per acre, as com- 

 pared with a yield of 134 bu. from cellar-selected seed, 64.75 bu. from field run, 

 88.72 bu. from run-out seed, 136.15 bu. from tuber-unit selection, 75.4 from little 

 field-run stock, and 144.6 bu. from little-selected stock. Tests with various 

 treatments for seed potatoes and spraying tests for tuber and leaf diseases and 

 insect pests are also reported. 



Twenty-four varieties of rutabagas, mangels, carrots, and stock turnips have 

 been tested. The highest-yielding varieties were the White Half Sugar mangels, 

 24.86 tons ; Sweet Russian rutabagas, 488.6 bu. ; Cowhorn turnip, 504 bu. ; and 

 Mastodon carrots, 355 bu. per acre. 



[Keport of field crops work at the Crookston substation] {Minnesota Sta. 

 Rpt. 1<J16, pp. 68-70, 72).— Field crops work for 1915, as noted above, is brietly 

 reviewed. 



[Report of field crops work at the Duluth substation] (Minnesota Sta., 

 Rpt. Duluth Substa., 1916, pp. 5, 6, 7, 9; abs. in Minnesota Sta. Rpt. 1916, pp. 

 79, 80). — In variety tests the average oat yield for the season was 42.5 bu. 

 per acre and the time required for maturity from 93 days for Sixty Day oats 

 to 113 days for the White Russian side oats. The early-maturing strains are 

 considered the best yielders. The average barley yield was 20 bu. per acre, 

 with Minnesota No. 105, a 6-rowed variety, highest. The 2-rowed barley. 

 Princess, required 93 days to ripen, while all others required 87 days. The 

 Alaska variety of peas is recommended because of its early maturity (84 days). 

 Minnesota No. 95 required 112 days. Twenty-two varieties of corn were tested, 

 the following giving the most promise for fodder : Minnesota No. 13, North- 

 western Dent, Longfellow, and King Philip Flint. 



Flax sown June 1 matured in 101 days. Rutabagas planted in May were 

 harvested the middle of October, little difference being noted between three 

 standard varieties. 



Fertilizer tests under a 3-year rotation plan, using rock phosphate manure 

 and acid phosphate, are reported. The crops grown were potatoes and ruta- 

 bagas. 



Three methods of seeding grass on cut-over land were compared. Harrowing 

 with a spring-toothed harrow before and after seeding proved more satisfactory 

 than harrowing before seeding, and this in turn was superior to harrowing 

 after seeding. 



[Report of field crops work at the Grand Rapids substation {Mintiesota 

 Sta. Rpt. 1916, pp. 75, 76, 77). — The crop yields secured in 1915 and the projects 

 in progress are briefly noted. • 



The average yield for all oats was 76.9 bu. and the average of 13 varieties, 

 91.7 bu., with Sixty Day highest with 110.6 bu. The wheat average was 26.9 bu. 

 per acre. The average of 13 varieties was 26.6 bu., with Prelude highest with 

 30.6 bu., followed by Marquis with 30.5 bu., and Haynes Bluesteni with 30.3 bu. 



The average barley yield was 42.6 bu. per acre, with an average for 10 

 varieties of 54.6 bu. O. A. C. No. 21 gave the highest yield, 63.9 bu. for the 

 6-rowed varieties, and Champion of Vermont, 55.6 bu. for the 2-rowed varieties. 



Average yields were .secured of corn for silage 3.4 tons ; potatoes. 130.6 bu. ; 

 clover and timothy (first cutting), 2.42 tons; and rutabagas (toppedK 24.47 

 tons per acre. Potato trials indicated homegrown seed to be superior to ini- 



