March, 1920] AGRONOMY 71 



475. Mullett, H. A. Minyip crop and fallow competition. Jour. Dept. Agric. Vic- 

 toria 17: 65-75. Fig. 7. 1919— See Bot. Absts. 3, Entry 860. 



476. Mullett, II. A. Garoke crop and fallow competition, 1918. Jour. Dept. Agric. 

 Victoria 17: 193-206. Fig. 7. 1919— See Bot. Absts. :'., Entry 862. 



477. Olin, W. H. Blood will tell in potatoes. Potato Mag. V: 7. 1 fig. 1919.— De- 

 scribes methods of a successful grower of seed stock. — Donald Folsom. 



478. Prescott, S. C. Dehydration of vegetables— past, present and future. Potato 

 Mag. I 9 : 6, 16-17, 20-23. 4 fig- 1919. — Describes development of the dehydration industry, 

 the methods employed, and discusses its importance. — Donald Folsom. 



479. Purvis, J. E. Bracken as a source of potash. Proc. Cambridge Phil. Soc. 19: 

 261-262. 1919. — Confirms report that in the summer months the bracken (Pteridium aqui- 

 linum (L.) Kuhn) contains more potash than in later months. The bracken ferns grown on 

 Welsh peaty soil yield more potash than those grown on Cambridge poor sandy soil. — Michael 

 Levine. 



480. Steinel, A. T. Story of the Skookum apple and its lesson for potato growers. Potato 

 Mag. I 9 : 5, 33-34. 1 fig. 1919. — Advocates better marketing methods. — Donald Folsom. 



481. Stewart, F. C. Missing hills in potato fields: their effect upon the yield. New 

 York Agric. Exp. Sta. [Geneva] Bull. 459: 45-69. Fig. 1-2. 1919. — An account of an experiment 

 designed to show how much of the loss due to missing hills or "skips" in potato (Solanum 

 tuberosum) fields is made up by the increased yield of adjoining plants. It was found that, in 

 the case of a "skip" containing a single missing hill, the two adjoining plants (one on either 

 side) together make up 46.4 per cent of the loss in total yield. From the data obtained, a 

 formula is evolved for use in computing the comparative yields of plats having different 

 percentages of missing hills; but it is pointed out that this formula applies only to a single 

 set of conditions, viz., such as obtained in the experiment. — Some data were obtained, also, 

 on the difference in the yield of the two members of a pair of plants from halves of the same 

 tuber when grown under conditions as nearly parallel as possible to field conditions. For 

 85 pairs of plants, the average difference, expressed in percentage of the mean yield of the 

 pair, was 20.7 per cent. — F. C. Stewart. 



482. Stuart, William. Commercial potato production in Florida. Potato Mag. I 8 : 

 6-8, 24-25. Fig. 1-9. 1919. — Discusses soil, location, varieties, importance of crop, irrigation 

 and other cultural practices, and marketing. — Donald Folsom. 



483. Tracy, S. M. Rhodes Grass [Chloris gaijana]. U. S. Dept. Agric. Farmer's Bull. 

 1048. 14 p., S fig. 1919. 



484. Waldron, L. R., and J. A. Clark. Kota, a rust resisting variety of common 

 spring wheat. Jour. Amer. Soc. Agron. 2: 187-195. Fig. 1-3. 1919. — A variety of bearded, 

 hard, red spring wheat designated as Kota (U. S. Dept. Agric, C. I. No. 5878) has been shown 

 to possess resistance to the form or forms of the stem rust of wheat present at Fargo, North 

 Dakota, Brookings, South Dakota, and St. Paul, Minnesota, in 1918. Some evidence of 

 such resistance had previously been secured in 1917. This resistance is decidedly greater 

 than that possessed by the common spring wheats and second only to the more resistant 

 durum wheats. Results secured at Fargo, North Dakota, in 1918 showed a capacity for 

 yield decidedly above the average of the common wheats and only slightly less than the aver- 

 age yield of the durum wheats. Milling tests conducted with Kota wheat showed it to pro- 

 duce somewhat less flour than the average of other wheats used in the same test. Baking 

 tests ranked it very high as a bread wheat, as it markedly exceeded the other common wheats 

 except Marquis, which it equaled. — F. M. Scherlz. 



