I'JELU CROPS. 739 



Mined with Bliss Triuin|ih in I'.Ml^, uMiiicly ;iit4 l»ii. per acre. Irish Cobbler 

 yiekhnl l-'nO.oT bu. per aero in 1!»11. 



In the fertilizer tests the i)lat receiving a complete fertilizer aiiplicatlon in 

 which dried blood was usetl as a source of nitrogen i)rodncc<l the lar>,'est yield, 

 with cottou-seed meal plus acid phosphate, second. Of the single fertilizers 

 the hiirhest yield was obtained with cotton-seed meal, with dried blood second. 



Selection and preparation of seed potatoes, size of seed piece and bud 

 variation, A. N. Hume and I. S. Oaki.anu (Huuth Dakota Sta. Bui. 155 {19U). 

 pp. 100-llt. fifln. -J). — This continues (he report of work previously noted (E. S. 

 R.. 29, p. 37). 



A comparison of yields from seed i)ieces taken from selected tubers and from 

 culls of two varieties showed in an average of nine cases an increased -yield 

 of 5.53 bu. per acre in favor of the selectetl seed, the average total yield per 

 acre being 114.2 bu. In this test the tubers were cut into quarters, so that 

 the culls represented smaller seed pieces. Early Ohio selected tubers averagd 

 G.15 oz. and the culls l.SS oz. in weight. Carmen No. 3 selected tubers averaged 

 S.4 oz. and the culls 2.0s c.z. 



A test of the Influence of size of seeil piece on yield consisted in iilanting 

 small, medium, and largo seed pieces taken from the same tuber. 



It is noted that from Early Ohio seed, the average yield from seed pieces 

 of 0.35 oz. was 183.S bu. per acre, from pieces weighing 1.4 oz., 272.53 bu.. and 

 from seed pieces weighing 2.G0 oz.. 2ns.,59 bu. With Carmen No. 3 seed, the 

 use of seed pieces of 0.35 oz. weight protluced an average of 1G5.()(> bu., those 

 of 2.1 oz. weight produced 270.9 bu., and those weighing 4.4 oz. produced 

 298,23 bu. 



As a result of a snuly of the influence of culls and selected seed upon type 

 and size of progeny it is statetl that "under the conditions of this experiment, 

 the use of sizeable seed produced a greater proi)ortion of potatoes of desirable 

 size than the use of culls. The type of potatoes produced from culls used as 

 seed is measurably smaller in the first generation than those i)roduced from 

 selected seed tubers. The results of this experiment furnish quantitative 

 evidence that the use of ' culls ' for seed causes potatoes to ' run out.' " 



" Not only is the type of tubers produced from selected seed larger than 

 from culls, but also the average weight of tubers produced is greater." 



A table shows the comjiarison of frequencies and weights of tubers produced 

 from culls and from selected seed tubers. 



Sudan grass, R. E. Karpeh (Oklahoma Sla. Bui. 103 (1915), pp. 3-lJ,. figs. 

 3). — This bulletin describes metlnHls of production of Sudan grass suitable for 

 Oklahoma conditions, together with some data on cultural tests. The results of 

 planting on eleven different dates, between April 15 and July 6. 1914, show early 

 May. from the sixth to the fourteenth, to be the most favorable time to plant 

 Sudan grass for hay. 



" It will be observed from the data given that the 6-in. rows gave larger yields 

 than the 21-in.. and the 42-in. rows gave by far the largest yields. The increase 

 of the 6-in. rows over the 21-in. rows was due to the fact that the crab grass and 

 other weeds grew up on the 21-in. plat and the rows were not of sufficient width 

 to permit the use of the cultivator to keep them down, while the G-in. rows were 

 close enough together to smother out the majority of the weeds. The 6-in. and 

 21-in. plats did not come on again after the first cutting was made on account of 

 lack of moisture. The plats of 42-in. rows made two cuttings, which also helps 

 account for their larger yields." 



In testing the projier time to cut Sudan grass for seed production larger yields 

 were obtained by cutting on July 28 than on July 14, 17, or 22, the largest yield 

 9.3681°— No. 8—15 4 



