1917] 



FIELD CBOPS. 



631 



of fallow, spring wheat, field peas, and spring wheat yielded 15.7 bu. per acre. 

 Wheat after peas yielded 22.3 bu. and after fallow 23.5 bu. New field-poa and 

 wheat rotations begun in 1916 on land sown to field peas continuously since 1912 

 gave average yields of 40.2 bu. of spring wheat after field peas, 27.4 bu. of field 

 peas after field peas, and 38.5 bu. of wheat after summer fallow. 



An attempt was made to determine the relative amounts of soil moisture used 

 by field peas, wheat, and corn, as compared with the amount con.served by sum- 

 mer fallowing. The following average results were secured from two determi- 

 nations : After spring wheat yielding 39.4 bu., 7.5 per cent moisture ; after corn 

 yielding 27.1 bu., 8 per cent ; after field peas yielding 27.7 bu., 9 per cent ; and 

 after fallow, 13.4 per cent. 



Numerous alfalfa varieties have been tested and produced excellent yields of 

 forage but, with the exception of Baltic and Grimm, have failed to produce seed. 

 Results obtained with sweet clover indicate that it may be equal to or even 

 superior to alfalfa as a hay crop. Several varieties of vetch have been tested, 

 with the best results -being secured from fall-sown hairy vetch. 



In variety tests with corn Northwestern Dent, with a 4-year average yield 

 of 23.2 bu. per acre, was highest and Minnesota No. 23 lowest with 14.4 bu. 

 Walla Walla White Dent and IMinnesota No. 13, with average yields of 22.5 and 

 19 bu., respectively, are especially reconunendetl for silage purposes. 



Green Mountain, with a 4-year average yield of 184 bu. per acre, was first in 

 potato variety tests, with Early Ohio lowest with 100.2 bu. Early Rose. Bur- 

 bank, and Irish Cobbler gave average yields of 155.5, 150.3, and 141.8 bu., 

 respectively. 



In the tillage experiments, tests of methods for disposing of the wheat stubble 

 resulted as follows: 



Effects of various treatments of the stuhble on the yield of winter wheat grown 

 after fallow, 1913-1916, inclusive. 



Eate of 'flowing;. 



Disked in 

 fall and 



spring. 



Disked in 

 spring 

 only. 



Not 

 disked. 



April 1 

 iMay 1 . 

 June 1. 



Bvshels. 

 26.6 

 27.2 



Bushels. 

 29.9 

 29.0 

 25.9 



Bushels. 

 33.5 

 27.2 

 21.0 



Tests of the time and manner of plowing for winter and spring wheat showed 

 an average yield of 28 bu. per acre for early fall plowing, as compared with 25 

 bu. for late fall plowing and 29.9 bu. for early spring plowing (April 1). Disk 

 plowing gave an average yield of 25.7 bu., while moldboard plowing averaged 

 27.2 bu. In early fall plowing with a disk plow the average yield amounted to 

 26.5 bu. and with the moldboard plow to 29.2 bu., while in late fall plowing the 

 difference was negligible. The 4-year average yield of winter wheat on plats 

 plowed April 1 amounted to 7.8 bu. per acre more than the average yields of 

 plats plowed June 1, although these variations are said to be largely dependent 

 upon seasonal conditions. Spring wheat sown on plats plowed deep yielded 19.1 

 bu. and on plats plowed shallow 18.7 bu. per acre. 



Analyses of samples of wheat grown on land plowed April 1 and June 1 showed 

 a marked increase in yellow-berry on the late-plowed land, amounting to almost 

 84 per cent in 1915. The protein content of the kernel on the early and late 

 plowed lands amounted to 13.35 and 8.49 per cent, respectively. The moist 

 gluten content with early plowing amounted to 30.4 per cent and after late plow- 

 ing to 1S.7 per cent. 



