191G] FIELD CROPS. 529 



as secured in plat tests although the season was unfavorable on account of 

 prevailing low temperatures. 



Studies made of the influence of freshly turned under green manures like 

 clover on the germination of seeds rich in oil indicated that germination is 

 injuriously affected by a soil fungus, Rhizoctonia, which is given most favorable 

 conditions of growth through the incorporation of organic matter. 



Investigations on the relation of sulphur to plant nutrition w^ere extended to 

 oats and barley which were materially helped, especially in seed production, 

 by an increased supply of sulphates, but the effect was not so marked as with 

 rape and clover. The influence of elemental sulphur, while sometimes beneficial, 

 was found often to exert a poisonous effect. 



Relative water requirement of corn and the sorg'hums, E. C. Miller ( TJ. S. 

 Dept. Agr., Jour. Agr. Research, 6 (1916), No. 13, pp. 473-484, pis. 3. fig. 1).— 

 In work carried on by the Kansas Experiment Station, the water requirement 

 was determined for four varieties of corn and two varieties of sorghum in 1914, 

 and for three varieties of corn and five varieties of sorghum in 1915. The work 

 was carried on at Garden City, Kans., where the plants were grown in large, 

 sealed, galvanized-iron cans containing approximately 110 kg. of soil, having a 

 wilting coefficient of 13 and a moisture content maintained at from 20 to 21 per 

 cent on the dry basis. Three plants of corn were ;'rown in each can during both 

 seasons, and 6 sorghum plants were gi'own in each can in 1914, but only 3 in 1915. 

 A summary of the data secured in the experiments, which are tabulated in de- 

 tail, show^s the follow'ing relative standing as to water requirement of the differ- 

 ent crops and varieties for the two years : In 1914, Blackhull Kafir corn 1, 

 Dwarf Milo maize 1.04, hybrid corn 1.09, Sherrods White Dent corn 1.22, and 

 Pride of Saline corn 1.24; in 1915, Blackhull Kafir corn 1, Dwarf Blackhull 

 Kafir corn 1.02, Dwarf Milo maize 1.12, feterita 1.14, hybrid corn 1.17, Pride of 

 Saline 1.23, Sherrods White Dent corn 1.27, and Sudan grass 1.41. 



Sorghum and millet, F. A. Welton (Mo. Bui. Ohio Sta., 1 (1916), No. 6, 

 pp. 168-174, fiffs. 2). — This article discusses briefly the culture and value of 

 sorghum and millet, and reports the yields secured in comparative tests with 

 these crops. 



A comparison of corn and sorghum during the four years beginning with 1912 

 showed that such late varieties of corn as Blue Ridge, Hickory King, and Boone 

 County White produced larger yields of green forage per acre than were ob- 

 tained from sorghum, while two early varieties, Darke County Mammoth and 

 Leaming, yielded less than sorghum. For the same period average yields of 

 10, 14, 9.1, 9.9, and 7.6 tons of green forage per acre are reported for Amber 

 sorghum. Orange sorghum, Red Kafir corn. White Kafir corn, and Yellow milo 

 maize, respectively. The average production for seven noncousecutive years of 

 Hungarian, German, Red Siberian, and Japan barnyard millet tested on the 

 station farm was 2.6, 4.4, 2.8, and 4.8 tons of dry forage per acre, respectively. 



Concerning' the growth and composition of clover and sorrel (Rumex aceto- 

 sella) as influenced by varied amounts of limestone, J. W. White (Pennsyl- 

 vania Sta. Rpt. 1914, pp. 46-64, pis. 13). — Studies on the general fertilizer plats 

 of the station, supplemented by pot experiments, were made wath reference to 

 the growth of sorrel as influenced by soil acidity. Work related to this subject 

 by other investigators is briefly reviewed and the results presented in tabular 

 form are discussed. Some of the plats on which the investigation was conducted 

 received ammonium sulphate as the source of nitrogen and showed an increasing 

 tendency to failure of clover and to a less extent of corn and wheat. 



In 1912-13 sorrel grew on plat 32 having an acid soil at the rate of 1 ton per 

 acre. In areas where the soil acidity required from 3,500 to 3,800 lbs. of 



