1917] FIELD CROPS. 829 



Experiments witli farm crops, F. App (New Jersey Stas. Rpt. 1915, pp. 181- 

 183). — Sudan grass seeded June 15 yielded 10.2 tons of green forage as com- 

 pared with 8.7 tons of Japan millet used as a check. Sudan grass did not prove 

 exceptionally palatable when fed to cows. A seeding of this grass May 15 did 

 not begin to make vigorous growth until late in June, while the later seeding 

 of June 15 was vigorous from the beginning. Sudan grass is not considered far 

 superior to the millets as a forage crop for New Jersey north of New Brunswick. 



In variety tests with corn, the highest-yielding variety (a Learning strain) 

 produced at the rate of 67 bu. per acre and the lowest-yielding variety 26.9 bu. 

 The variety giving the highest grain yield likewise gave the highest stover 

 yield, at the rate of 3.66 tons per acre. 



[Field crops work on county experiment farms in Ohio in 1915, C. W. 

 Montgomery et al. (Ohio Sta. Bui. SOS (1916), pp. 7S-102, 107-126, 129-1^7, 

 U9-152, 15S-166, 168-172, 174-176, 185-197, 200-207, figs. 17).— This reports 

 work in 1915 at the experiment farms located in Miami, Paulding, Clermont, 

 Hamilton, and Washington counties in continuation of that previously noted 

 (E. S. R., 33, p. 828), together with work in Hancock County last reported on 

 in 1911 (E. S. R., 28, p. 40) and in Trumbull and Mahoning counties, which 

 is reported here for the first time. The reports for the several farms include 

 the results of rotation tests, including corn, oats, wheat, clover, soy beans, 

 sugar beets, potatoes, and tobacco ; fertilizer and barnyard manure experiments 

 with the crops in rotation ; liming tests ; variety tests with corn, oats, wheat, 

 and soy beans ; fertilizing experiments with pasture lands and alfalfa ; early 

 and late sSeeding tests with wheat; a depth of plowing test with corn and soy 

 beans ; and a comparison of Sudan grass with German millet on the Paulding 

 County farm. The data obtained from the fertilizer and barnyard manure ex- 

 periments and the variety tests at all the stations are summarized in tabular 

 form, together with data showing the direct and residual effect of chemical 

 fertilizers and barnyard manure. 



In comparing Sudan grass with millet on plats in which both were drilled 

 solid, the Sudan grass exceeded the millet by an average of 1,250 lbs. of hay per 

 acre. 



In all cases, except on the Paulding County farm, acid phosphate has produced 

 profitable increases in crop yields. The larger quantities of acid phosphate 

 used in the more recent experiments have not yet produced increased yields 

 proportionate to the quantity applied, as compared with the results at Wooster 

 and Strongsville, the increases in these tests for the first five years amounting 

 to 4 bu. of corn in each case and less than 2 bu. of wheat at Wooster and 5i bu. 

 at Strongsville. 



The average increase of corn in the 12 tests has been 5i bu., obtained with 

 an average application of 152 lbs. of acid phosphate, and the average increase 

 of wheat 5§ bu., with an average application of 157 lbs. The addition of an 

 average of 50 lbs. of muriate of potash has increased the average yield of corn 

 in the 12 tests by a little more than 2^ bu. and that of wheat by IJ bu., sufficient 

 to cover the cost of the additional fertilizer in either case. 



The addition of 63 lbs. of nitrate of soda per acre on corn and of 83 lbs. on 

 wheat to the combination of acid phosphate and muriate of potash resulted in 

 average increases of only 1^ bu. of corn and 2 bu. of wheat, insufllcient to cover 

 the cost of the nitrate. 



In comparing the direct and residual effects of barnyard manures in a 5-year 

 rotation at Wooster, it was found that for the 20 years 1894-1913 the direct 

 effect of an 8-ton application to both the corn and wheat crops amounted to 

 increased yields conservatively valued at $23.74 per acre, while the residual 



