824 EXPERIMENT STATION RECORD. [Vol.40 



69, flg. 1). — These reports note the progress of investigational work at this 

 station, and are supplemented by tabulated data showing the treatment and 

 yields per acre of the experimental plats for each year of the period indicated. 

 Recent papers based on work done at Rothamsted and published elsewhere are 

 briefly reviewed. 



[The Woburn field experiments, 1917], J. A. Voelckek (Jour. Roy. Agr. 

 Soc. England, 78 (1917), pp. 220-231; Wobum Expt. Sta. Rpt., 1911. pp. 2-1S).— 

 This describes the continuation of work previously noted (E. S. R.. 30, p. 529). 

 The season of 1916-17 is said to have been very unfavorable for practically all 

 crops grown in the experiments. 



The highest wheat yield in the continuous wheat experiments was obtained 

 from the plat receiving mineral manures and nitrate of soda and amounted to 

 30 bu. of grain and 2,043 lbs. of straw per acre, the average yield for the un- 

 treated checks being 11 bu. of grain and 714 lbs. of straw. The next best re- 

 sults were obtained with mineral manures and in alternate years, nitrate of 

 soda, with a yield of 28.5 bu. of grain and 1,S43 lbs. of straw per acre, while 

 barnyard manure was next in order with 27.0 bu. of grain and 2,062 lbs. of 

 straw. With mineral manures alone there was produced 13.0 bu. of grain and 

 993 lbs. of straw. The sulphate of ammonia plats continued to show the need 

 of lime for profitable crop production. Nitrate of soda showed markedly bet- 

 ter results than sulphate of ammonia. With potash without phosphate there 

 was produced 2.3 bu. more than with phosphate without potash. 



The highest yield in the continuous barley experiments amounted to 27.2 bu. 

 of grain and 1,568 lbs. of straw, bom the plat receiving mineral manures and 

 sulphate of ammonia with applications of one ton of lime made in 1005 and 

 again in 1016. The barnyard manure plat with a yield of 26.7 bu. of grain and 

 2,020 lbs. of straw, and the plat receiving mineral manures and in alternate 

 years, nitrate of soda, with a yield of 26.7 bu. of grain and 1.620 lbs. of straw 

 per acre were next in order. The average yield for the untreated clucks 

 amounted to 15.8 bu. of grain and 1,069 lbs. of straw. With mineral manures 

 alone there was produced 18.5 bu. of grain and 1.104 lbs. of straw, and with the 

 addition of one ton of lime in 1915, 21.5 bu. of grain and 1,340 lbs. of straw. 

 Nitrate of soda failed to show any superiority over sulphate of ammonia this 

 season, while the usual failures with the latter when used without lime were 

 observed. With potash about one bu. more grain was produced than with 

 phosphate. 



Further observations on the comparative manurial value of unexhausted 

 residues from so-called cake and corn feeding on the rotation plats are said to 

 indicate that cake feeding La not necessarily superior to corn feeding as meas- 

 ured by increases in the yields of wheat and barley grown on the respective 

 plats. 



Green manuring experiments with wheat failed to give conclusive results. 

 An application of four tons of magnesia per acre made in 1915 resulted in a 

 yield of 10.2 bu. of wheat in 1017 as compared with 6.5 bu. from the untreated 

 check. A similar application made in 1917 also gave 10.2 bu. of era in. 



In the improvement of old pasture land the highest yield, 3,558 lbs. of hay 

 per acre, followed an application of 12 tons of manure made in 1013. Buxton 

 lime and magnesium lime with yields of 3,052 and 3,024 lbs. per acre, respec- 

 tively, proved best for grass land in a comparison of different sorts of lime. 

 Comparing different forms of lime, ground chalk with a yield of 3,528 lbs. Of 

 hay per acre and ground limestone with 3380 lhs. were best. A grass plat 

 always harvested for hay produced 2,788 lbs. per acre as compared with 2384 

 lbs. from a plat alternately mown for hay and grazed. A botanical examine- 



