FIELD CROPS, 631 



that it will soon die; A. repens withdraws abundantly available plant food in 

 proportion to the fertility of the soil, but without appreciable increase in growth 

 of its top. A crop of good stand (oats) prevented A. repctu from withdrawing 

 appreciable large quantities of plant food from a fertile soil and was little in- 

 jured by its presence, and scarcely any more plant food was removed from the 

 soil by the association than by oats alone. 



Cultivation and composition of conifrey (Symphytum asperrimum) (C///- 

 /»;■«. 2^; (IDlJf), Xo. .Uf), pp. .JG2-3GG). — This article briclly discusses the culti- 

 vation of this crop, and gives analyses and yields of a Caucasian variety, har- 

 vested at different dates throughout the season. The results of this work, per- / 

 formed at the seed-control station at Wageningen, are given in tabular form. // 



Corn judging', R. A. Moore (Wisconsin 8ta. Circ. 8 (1913), 2. rev. eel., pp. "* 

 23. figs. J J). —A revised and enlarged edition (E. S. R., 22, p. 233). 



Variety work with corn and cotton, C. K. McClelland (Georgia Hfa. Bitl. 

 lis (1915), pp. 2^/9-256, figs. 2). — Data showing the number of 2-eared stalks, 

 number of barren stalks, and the yield and percentage of corn to ear from 14 

 varieties of corn for 1914 are given and briefly discussed. The yields ranged 

 from 16.1 to 23.9 bu. per acre, and the percentage of corn to ear from 80.5 to 

 90.9. The highest yielding variety. Velvet Cob, produced ears averaging 88.5 

 per cent corn. 



The results of testing 32 varieties show yields of seed cotton per acre ranging 

 from 842 lbs. to 1..295 lbs. and the percentage at first picking from ,33 to 77. The 

 variety Sawyer Improved, producing the highest yield of lint. 442 lbs. per acre, 

 showed 37 per cent lint and 56 per cent at first picking. The variety Perry Im- 

 proved, showing the highest percentage at the first picking, gave a yield of only 

 278 lbs. of lint per acre. 



Cowpeas in the cotton belt, W. J. Morse ( U. 8. Dept. Agr., Off. 8ec. 8pec. 

 [C'/y-f.], 1915, Feb. 13, pp. 5). — This gives cultural methods and uses. 



The dasheen, a root crop for the South, R. A. Young (U. 8. Dept. Agr., Bur. 

 Plant Indus. Doc. 1110 (191Jf), pp. 11, pis. Jf). — A revision and extension of a 

 paper previously noted (E. S. R., 29, p. 336). 



Report of experiments with oat varieties at the Stockholm experiment 

 fields for the period 1908—1912, S. Rhodin (Meddel. Ccntralanst. Forsoksr. 

 Jordhruksomnnlet, No. 100 (1914), PP- 16; K. Landtbr. Akad. Handl. och 

 Tidskr., 53 (19U), No. 6, pp. 435-J, 48). —This article gives results obtained with 

 15 varieties of early, medium, and late maturing oats. Tabulated data include 

 the yield of grain and straw, days to maturity, dry weight, green weight, weight 

 per hectoliter, and percentage of hull. 



The average yields of grain for the different varieties for the period ranged 

 from 2,835 kg. (2,523 lbs. per acre) to 3.779 kg. per hectare, while the per- 

 centage of hull varied from 25 to 31.6 per cent. The percentage of hull showed 

 no correlation with the grain yield. The best yielding variety showed the 

 highest percentage of hull, thus making It in actual value the most inferior of 

 all the varieties tested. 



Hom.e-mulched vs. northern seed potatoes for eastern Nebraska, R. A. 

 Emerson (Nebr(i.ika Sta. Bui. 146 (1914), PP- 5-36, fig. 1). — " Exiwriments car- 

 ried on at this station show clearly that it is possible to increase the produc- 

 tiveness of potatoes by proper methods of breeding. But potato breeding can 

 not be carried on successfully unless the same stock of potatoes can be kept 

 indefinitely. This can not be done in southern and eastern Nebraska with 

 ordinary methods of culture. The importance of producing improved strains 

 of potatoes for this region makes it desirable to devise a method of producing 

 strong seed tubers at home. 



