BOTANICAL ABSTRACTS 



A monthly scrinl f urnishinR abstracts and citations of publications in the international field of 



botany in its broadest sense. 



UNDER THE DIRECTION I 1 



THE BOARD OF CONTROL OF BOTANICAL ABSTRACTS, INC. 



Burton E. Livingston, Editor-in-Chief 

 The Johns Hopkins University, Baltimore, Maryland 



Vol. IV JULY, 1920 No. 1 



ENTRIES 1-1853 



AGRONOMY LIBpapy 



C. V. Piper, Editor 

 Mart R. Burr, Assistant Editor 



1. Amos, Arthur. The difficulties of growing red clover. Clover sickness, and other 

 causes of failure. Jour. Roy. Agric. Soc. England 79: 68-88. 5 fig. 1918. — Failure of 

 red clover crops commonly known as "clover sickness" is held to be due to one of two 

 diseases, either eelworm disease or stem rot disease of clover. These two common diseases 

 are described and leguminous crops attacked by each given. The remedy advised is to 

 avoid all susceptible crops for a period of years. The author states that the evidence in 

 support of toxic substance being excreted by the previous clover crop and causing clover sick- 

 ness, is scant. — J . J. Skinner. 



2. Anonymous. The food value of the potato crop. Jour. Bd. Agric. [London] Supplem. 

 18:23-27. 1919. — Analyses of the composition of 247 samples of potatoes grown in the 

 United Kingdom in 1917 gave the general averages of 22.09 per cent dry matter and 0.327 

 per cent nitrogen. These are appreciably lower than the Continental averages as quoted 

 by Konig, viz., 25.0 per cent and 0.336 per cent respectively, and slightly higher than the 

 average dry matter content (21.7 per cent) commonly given for American potatoes. — No 

 significant difference in composition was indicated between the late or maincrop varieties 

 and the early varieties. A consistent difference representing probably, in the main, the 

 effects of difference of rainfall was found between the potatoes grown in the eastern and 

 in the western halves of the country as arbitrarily divided by longitude 2 AY, the averages 

 being 22.72 per cent and 0.331 per cent, and 21.79 per cent and 0.337 per cent respectively.— 

 M. B. McKay. 



3. Anonymous. Peat soils in Iowa. Jour. Amer. Peat Soc. 12:201-202. 1919.— There 

 are two classes of peat soils in Iowa, the shallow (not over 3 feet) and the deep. Drainage by 

 tiling is recommended. Corn and small grain crops usually do not do well on new I; ■ ed 

 peat. For forage a mixture of timothy and alsike clover is best. — G. B. Rigg. 



3 4. Anonymous. Wart disease of potatoes order, 1918, and inspection of immune crops. 



Jour. Bd. Agric. [London] Supplem. 18: 114-115. 1919— See Bot, Absts. 4, Entry 1232. 



5. Anonymous. Agricultural possibilities of the Sahara. Sci. Amer. Supplem. 87: 297. 

 , 1919. 



BOTANICAL ABSTRACTS, VOL. IV, NO. 1 



