4 AGRONOMY [Bot. Absts., Vol. VI, 



21. Jenkins, E. H., andG. P. Clinton. Fertilizer experiments with potatoes. Connecti- 

 cut [New Haven] Agric. Exp. Sta. Bull. 214: 421-422. 1917 and 1918.— This is a series of ob- 

 servations on the yields of potatoes as affected by different fertilizers, especially potash. A 

 4-8-4 and a 2-9-4 each on duplicate plots gave rather uniform yields in 1917. The addition of 

 1000 pounds wood ashes to the Essex 4-10-0 fertilizer increased the yield somewhat in one 

 case, but was without effect in another. The addition of 2000 pounds wood ashes to the 

 same fertilizer increased the yield somewhat in the first case and in a more pronounced degree 

 in the second. The ashes induced scab. The 4-10-0 fertilizer in 1917 gave as good yields as 

 4-8-4 when each was applied at the rate of 1000 pounds per acre. In 1918 on other land a 

 3-8-3 formula in comparison with a 4-10-0 formula each applied at the rate of 1800 pounds — 

 800 pounds before the first harrowing, 400 pounds in the planter and 600 pounds at the second 

 cultivation — gave 50 bushels the greater yield for the potash. — Henry Dorsey. 



22. Juhlin-Dannfelt, H. Oversikt av ograslagstiftningen i utlandet. [Review of weed 

 legislation in foreign countries.] K. Landtbr. Akad. Handl. och Tidskr. 58: 166-174. 1919. — 

 Summary of laws affecting weeds and weed control in European countries, United States, 

 Canada, and Australia. — E. G. Anderson. 



23. Kiessling, L. Die Leistungen der Wintergerste und deren Zuchterische Beeinflussung. 

 [The yields of winter barley and their significance in breeding experiments.] Illustr. Landw. 

 Zeitg. 39 : 310-311 . 1919. — A popular discussion, the importance of the subject being empha- 

 sized. The writer's own experiments, carried on since 1911, gave no positive results. — John 

 W. Roberts. 



24. Kleberger, [ ]. Die wissenschaftliche und praktische Bedeutung der Priifung 



des Anbauwertes unserer Oelpfianzen. [The scientific and practical significance of the testing 

 of the agricultural value of our oil-producing plants.] Illustr. Landw. Zeitg. 39: 249-250. 1919. 

 — The writer discusses chiefly the possible financial returns which may be obtained from the 

 culture of oil-producing plants. — John W. Roberts. 



25. Kling, M. Die Diingung des Tabaks. [The fertilization of tobacco.] Illustr. Landw. 

 Zeitg. 39: 473-474. 1919. — The tobacco plant needs a rather large amount of potash, but 

 should receive as little chlorine as possible. It is well, therefore, to grow tobacco after 

 beets. Crude potash salts should not be used. Stable manure comes first as a fertilizer for 

 tobacco and should be used at the rate of 600 Dz. per hectare. Usually it should be applied 

 in the autumn, but on light soils half should be applied in the spring and half in the autumn. 

 Potassium sulphate at the rate of 4 Dz. per hectare should be applied in the spring. Usually 

 70 kgm. of ammonium sulphate or better, 35-10 kgm. of urea per hectare are needed. When 

 stable manure is used, phosphoric acid is not necessary. Too much phosphoric acid causes 

 early maturity and poor quality. Calcium should be applied to soils in which it is lacking. — 

 John W. Roberts. 



26. Lenart, G. H. Neue Verarbeitungsweise der Zichorie. [New manufactured prod- 

 ucts from chicory.] Illustr. Landw. Zeitg. 39: 479-480. 1919. — The new products are: (1) 

 inulin, from which levulose and a liquid sugar-dye are obtained; (2) chicory sirup, from which 

 may be obtained a coffee substitute, a sugar-dye in dry form, and alcohol; (3) dry shreds, 

 which may be used as feed for animals. — John W. Roberts. 



27. Maiden, J. H. Chats about the prickly pear. Agric. Gaz. New South Wales 31: 325- 

 332. 4 fig- 1920. Discusses the use of Opuntia spp. as a feed for stock. — L. R. Waldron, 



28. Mundy, H. G. Improvement of Rhodesian pastures. Rhodesia Agric. Jour. 17: 113- 

 117. 4 pl- 1920.— Encouraging results have been obtained with grasses indigenous to Africa, 

 which have in general proved more successful than exotic species. — E. M. Doidge. 



