1918] FIELD CROPS. 431 



In field plat tests with flax varieties, yields were obtained amounting to 

 6.4 bu. per acre for Select Russian (C. I. No. 3), 5 bu. for Smyrna (C. I. No. 30), 

 4.7 bu. for North Dakota Resistant No. 114 (C. I. No. 13), 2.3 bu. for Punjab 

 (C. I. No. 20), and for Soddo White (C. I. No. 36), with estimated stands 

 of 75, 30, 95, 20, and per cent, respectively. Eight of 12 additional varieties 

 grown in single nursery rows sustained a loss in stand of from only 5 to 10 

 per cent, with yields estimated to vary from 10.2 to 5.7 bu. per acre. Arranged 

 in order of higliest yield these varieties were C. I. Nos. 18, 19, 25, 3, 12, 16, 27, 

 and 14. In date-of-seeding tests with flax, seedings of 25 lbs. per acre of North 

 Dakota resistant No. 114 were made at 15-day intervals beginning October 15 

 and ending January 5. The yields varied from for the January 5 planting to 

 9.3 bu. per acre for the November 15 planting. 



In variety tests with field peas the Kaiser and Gray Winter were the only 

 varieties to withstand successfully the winter temperatures of 1915-16. The 

 former yielded at the rate of 2,100 lbs. of cured hay and 3.8 bu. of peas per 

 acre and the latter at the rate of 1,800 lbs. of hay and 1.25 bu. of seed per 

 acre. Kerrville, although severely injured by frost, yielded at the rate of 

 900 lbs. of hay and 2.5 bu. of seed. 



[Report of field crops work at the Umatilla experiment farm, Oreg., in 

 1915 and 1916], R. W. Allen (U. S. Dept. Agr., Bur. Plant Indus., Work Uma- 

 tilJa Expt. Farm., 1915-16, pp. 16-18, 22-27, 32-37).— This reports the results 

 of crop rotation experiments by H. K. Dean and numerous variety tests with 

 corn, grain sorghums, and miscellaneous forage crops. 



The crop rotation experiments begun in 1915 were planned to study the effect 

 of the combination of crop, manure, and cover crops on crop yield and on the 

 physical condition of the soil. The plats are irrigated by an underground pipe 

 system. Applications of manure amounting to 8 and 32 tons per acre resulted 

 in very pronounced increases in the yields of alfalfa and feterita grain and 

 fodder for 1915 and 1916, with the plats receiving 8 tons yielding more in pro- 

 portion to the manure used than those receiving 32 tons. 



Crops for soil improvement, the harvesting of hairy vetch for seed, and 

 variety tests with soy beans, field peas, vetches, and minor leguminous crops 

 are briefly noted. Variety tests with soy beans in 1915 resulted, in yields of 

 hay amounting to 4,823.5 and 4,654 lbs. per acre for IMediurj- Yellow and 

 Auburn, respectively. The highest-yielding variety of field peas in 1915 was 

 Canadian with 4,409 lbs. of hay per acre. 



In variety tests with corn for silage during 1913-1915, inclusive. Pride of the 

 North has given the largest yield, although Reld Yellow Dent proved equally 

 as good in 1915. Silver King, with 980 lbs. of grain on the cob, showed the 

 highest grain yield in 1915. Of the sorghum varieties tested in 1915, Red 

 Amber was first in yield of forage with 19,658 lbs. per acre green weight and 

 10,653 lbs. of stover. Dakota Amber was first in yield of grain, with 1,502 lbs. 

 per acre, and Dwarf hegari second with 1,401 lbs. For new land or coarse land 

 without a high-water table these last are deemed much more desirable than 

 corn, although for productive land corn is regarded as a more satisfactory 

 crop. 



Sudan grass sown in 3 ft. rows in 1916 and irrigated at intervals of one, two, 

 and three weeks showed yields amounting to 1.500, 2,800, and 3,000 lbs. of 

 cured hay per acre, respectively, and when sown broadcast yields amounting to 

 2,200, 2,300, and 3,900 lbs. per acre, respectively. Sown in rows in 1915 Sudan 

 grass gave a yield of 2,228 lbs. of cured hay per acre, including 500 lbs. of 

 seed. A plat from which a soiling crop was taken in .July yielded at the 

 rate of 1,757 lbs. of cured forage per acre and 137 lbs. of seed. 



