1018] FIELD CROPS. 441 



" Summer tillage has given the highest average yields of any method under 

 trial at 11 of the 13 stations. However, on account of its high cost, due to extra 

 lahor and alternate-year cropping, it has not netted tlie largest returns except 

 at Huntley. 



" Green manuring is the most expensive method under investigation. It has 

 given the smallest net returns of any of the methods at all of the stations ex- 

 cept Huntley, where the profit from it is slightly greater than from either fall 

 plowing or subsoiling. 



" In comparison with spring wheat, winter wheat shows a greater response 

 to summer tillage and is the more profitable crop to grow on land so prepared. 

 This appears to be true at all stations studied except possibly Garden City 

 [Kans.], Dalhart [Tex.], and Tucumcari [N. Mex.], where large average losses 

 attend the growth of either crop." 



Extending the area of irrigated wheat in California for 1918, F. Adams 

 (California Sta. Circ. 182 (1917), pp. Jf). — This briefly outlines the possibilities 

 of increased wheat production in the Sacramento, San Joaquin, and Imperial 

 Valleys of California by a judicious use of available irrigation facilities. 



More wheat (Arkansas Sta. Circ. 31 [1917], pp. 4)- — A brief, practical out- 

 line on wheat growing in Arkansas. 



Agricultural seed: Concerning the germination of seed, C. P. Burns, A. K. 

 Peitersen, and L. H. Flint (Vermont Sta. Bui. 205 (1917), pp. 3-48, pis. 4).— 

 This reports the results of purity and germination tests of 3G5 official samples 

 of agricultural seed collected throughout the State during May, 1917, together 

 with a discussion of the Vermont agricultural seed law. Approximately one- 

 twelfth of the samples analyzed were not guaranteed as required by law and 

 about 2 per cent of those that were guaranteed were found to be seriously de- 

 ficient in purity. 



The importance of the home determination of the viability of seed is em- 

 phasized and simple devices for determining the germinability of seed briefly 

 described. 



Seed Beporter (U. S. Dept. Agr., Seed Rptr., 1 (1917), No. 2, pp. 8).— This 

 number contains statistical information and tabular data on the supply of clover 

 and alfalfa seed held by large dealers November 15, 1917, and on the preliminary 

 garden seed survey of November 1. 



Market conditions and seed movements are noted as follows : Sorghum seed 

 and German millet in Kansas and Missouri ; cowpeas in the cotton States ; sweet 

 clover, Sudan grass, and alfalfa in Kansas; clover an." timothy at Toledo, Chi- 

 cago, and Milwaukee ; Kentucky bluegrass in Missouri and Iowa ; and soy beans 

 in Mississippi and Louisiana. The seed corn situation throughout the corn 

 belt is briefly reviewed and the seed sweet corn situation noted. Thresher re- 

 ports of clover and timothy in Michigan are given, and tabular data presented 

 on imports of forage plant seed permitted entry into the United States during 

 November. 



Special articles include Clover Seed Production, by A. J. Pieters, and The 

 Lespedeza Seed Production and Movement for 1917, by H. S. Coe. The necessity 

 of a reserve supply of cottonseed for 1918 plantings is emphasized. Suggestions 

 relating to the labeling of field crop seeds, as adopted by the U. S. Department 

 of Agriculture and representatives of the seed trade, and later approved by 

 the seed trade associations, provide that lots of 10 lbs., or over, of field crop 

 seeds shall be so labeled as to show the name of the seedsman, the kind of seed, 

 the viability of the seed, and the origin of the seed. 



