No. 3, October, 1921] AGRONOMY 179 



1145. Snkll, Karl. Das Kartoffelsorten Archiv des Forschungs-Institutes fiir Kartoffel- 

 bau. [Potato-variety records of the institute for investigations in potato culture.] Illus. 

 Landw. Zeitg. 41 : 74. 1 colored -pi., 1 fig. 1921. — A system of photographic records of charac- 

 teristic features of various varieties has been perfected and gives very satisfactory results 

 as a substitute for fresh specimens. — M. Shapovalov. 



1140. Stumpel, E. Verdoppelung der Kartoffelernten durch starke Stickstoffdiingung. 

 [Doubling potato yields by heavy nitrogenous fertilization.] Illus. Landw. Zeitg. 41 : flO. 1921, 

 — Attention is drawn to the advantages of using commercial fertilizers and lime for potato 

 fields. — .1/. Shapovalov. 



1147. Thompson, 0. A. Twelfth to eighteenth annual reports Edgeley Sub-station, 1914- 

 1920. North Dakota Agric. Exp. Sta. Bull. 145. 44 P-> 1 fid- 1921. — Yields are presented of 

 24 varieties of spring wheat for 190S-191G and for 10 varieties for 1920. The 1920 yields varied 

 greatly due to attacks of stem rust. The new rust-resistant variety of common wheat, Kota, 

 greatly outyielded all other common varieties and was exceeded only by Monad, Acme, and 

 "D-5," — rust-resistant durums. Flax variety yields are given for 1912-1916; but little varia- 

 tion is shown. The oat variety Siberian White, and the barley variety Oderbrucker. have been 

 consistent high yielders. — In a comparative trial of forage crops extending over 12 years, 

 brome-grass (Bromus inermis) yielded on an average 1.36 tons, alfalfa 1.04 tons, common red 

 clover 0.5S tons, and maize 1.98 tons per acre. Foxtail millets yielded an annual average of 

 about 2.5 tons of hay for 5 years. Notes are given on field peas, sweet clover, slender wheat- 

 grass {Agropyron tenerum), and rape. — Early Ohio and Early Six Weeks are said to be the 

 best-yielding potato varieties. Notes are given on potato culture. — In a trial covering 6 

 years, oats were seeded at 10 different rates, from 3 to 12 pecks per acre. The highest net 

 yield was secured from the 8-peck rate. In a similar trial with barley the 6-peck rate gave the 

 highest net yield. Similar trials were conducted for both common and durum wheats for a 

 period of 7 years with rates from 2 to 11 pecks per acre. With durum wheat the largest net 

 yield was secured from the 7-peck rate, closely approached by that of the 5-peck rate. With 

 common wheat the largest net yield resulted from sowing 8 pecks per acre, but seedings of 

 5, 6, and 7 pecks gave only slightly lower yields. — Early fall plowing produced better yields 

 in continuous wheat culture trials than later fall plowing. All spring methods, on the average, 

 outyielded all the fall methods, in preparing ground for continuous wheat culture, by 3.2 

 bushels per acre. — In continuous cropping experiments with common and durum w^heats, 

 oats, and barley, plowing 6 inches deep gave yields as good or better than those secured from 

 6-inch plowing accompanied by subsoiling alone or subsoiling and packing. Subsoiling was 

 done every 4th year. — Yields of grain are given for wheat, oats, and barley, and fodder of 

 maize when grown under methods of (1) continuous cropping and (2) alternate cropping with 

 clean summer tillage. Yields of wheat were increased by 14 per cent under alternate clean 

 summer tillage. Increased barley yield was but slightly better on the clean summer tillage. 

 Yields of oats were increased 52 per cent by alternate tillage. An absolute loss of maize 

 fodder resulted w^hen grown on clean summer tillage, the cleanly cultivated soil seeming to 

 have an inhibitory effect upon maize yields. — When wheat or oats followed fallow in a rotation 

 the increase in yield, compared with that secured from these crops following small grain in 

 rotation, w^s not over 20 per cent. — Averaging the results of 13 years, little or no advantage 

 was secured in plowing under a green manure crop of winter rye, field peas, or sweet clover 

 preparatory to growing wheat or oats, in comparison to the same crops grown after clean 

 summer fallow. In a 4-year rotation where wheat followed a clean-cultivated, manured 

 svunmer fallow, the increase in yields of wheat compared with unmanured trials was 1 .8 bushels 

 per acre, or 11 per cent. The increased yield of fodder of the succeeding maize crop was 877 

 pounds, or 25 per cent, and the increase in yield of the next succeeding oat crop 8.2 bushels, 

 or 24 per cent. In similar rotations, in which, however, oats followed manured fallow, the 

 increases in yield were: Oats, 1.3 bushels, or 3 per cent; maize fodder, 967 pounds, or 28 per 

 cent; and wheat, 1.7 bushels, or 10 per cent. These results are the averages of 12 years. — 

 In a series of 3-year rotations, wheat and barley jielded more following maize than when fol- 

 lowing clean summer tillage (average of 14 years' results). Oats yielded 4.9 bushels, or 12 



