1918] FIELD CROPS. 229 



fertile soil. Thus, as nn average for two years, eqiial applications of sheep 

 manure to infertile, Intermediate, and fertile soils reduced the water require- 

 ments for ear corn production 42.6, 25.4, and 10.5 per cent, respectively. For 

 total dry matter these water requirements were reduced 28.9, 17.1, and 8.1 per 

 cent, respectively. However, the total water requirement per plant was in- 

 creased by an application of manure to infertile, intermediate, and fertile soil, 

 respectively, 106.7, 42.6, and 28.7 per cent. . . . 



" The water requirement for milo maize was the same as the average for 11 

 corn varieties, while' it was considerably higher for Black Amber sorghum. It 

 appears that the drought-resistant qualities of certain crops must lie elsewhere 

 than in a markedly low water requirement per pound of dry matter." 



In cereal investigations it was concluded that small seed when compared 

 in equal numbers with large seed appeared at a disadvantage, but when planted 

 in equal weights the yields were practically the same. When grown in compe- 

 tition plants from large seed appeared to have a slight advantage over those 

 from small seed. 



[Report of field crops work in Pennsylvania] {Pennsylvania Sta. Bui. 147 

 (Wn), pp. 25-31, figs. 4).— Continuing work previously noted (E. S. E., 38, 

 p. 34), a comparison of plowing depths of 7.5 and 12 in., both in the fall and 

 spring, for crops in rotation since the fall of 1909 has led to the conclusion that 

 fall plowing gave slightly better yields of corn than spring plowing, while with 

 all other crops the time of plowing made no significant difference in yield. Deep 

 plowing gave no greater yields than shallow plowing. 



In variety tests with wheat Dawson Golden Chaff has given the highest 

 average yield, 33.4 bu. per acre, for the period of 1911 to 1916, with 11 others 

 ranging from 30 to 30.7 bu. per acre. 



The range in average yield of marketable tubers of 43 varieties of potatoes 

 tested for the period of 1911 to 1916 was fi'om 88 to 177 bu. per acre. The lead- 

 ing varieties were Silver King, Pan American, Whiton White Mammoth, Petos- 

 key, Heath Late Beauty, Hamilton Early, Norcross, and Rural New Yorker 

 No. 2, in the order named. 



The leading oat varieties for 1911 to 1916 were Big Four, New Zealand, 

 Fourth of July, Joanette, Kherson, New Danish White, and Czar of Russia. 



In soy bean variety tests the leading varieties in order of yield for the four 

 years of 1913-1916, inclusive, were as follows : In seed — Ebony, Chestnut, Mon- 

 gol, Ito San, Ohio 10015, and Amherst; and in hay— Ohio 7496, Ohio 10015, 

 Chestnut, Medium Green, Ohio 9035, and Amherst. The average yield of seed 

 for the four-year period for the 20 varieties in the test amounted to 14.2 bu. and 

 of hay, 4,462 lbs. In experiments to test the value of soy beans in place of 

 oats in the rotation, it was concluded that the crops are of about equal value, 

 except possibly in southern Pennsylvania, where soy beans yield better and 

 where oats are less profitable. Soy beans planted with corn have resulted in 

 slightly increased yields of dry matter and of protein. 



The fertilizer treatments and yields from 1910 to 1916, inclusive, for a crop- 

 ping system of corn, wheat, and clover on depleted land are outlined, but nv 

 definite conclusions drawn. 



[Report of field crops work for 1915], J. B. Harrison, C. K. Bancroft, 

 and R. Ward {Rpt. Dept. Set. and Agr. Brit. Guiana, 1915, pp. 5-12, 13-15; 

 Jour. Bd. Agr. Brit. Guiana, 10 {1911), No. 2, pp. 62-19). — A number of variety 

 and hybrid tests with sugar cane and rice are reported, together with fertilizer 

 tests with sugar cane. 



Sulphate of ammonia resulted in a yield of 4.7 tons of cane per acre more than 

 nitrate of soda. Applications equivalent to 450 lbs, of ammonium sulphate 



