FIELD CROPS. 831 



moderate density. On tbe other baud, some showed themselves very sensitive 

 either (1) by chemotactic movements, as Boehtneria utilis, B. polystachya, 

 Impatiens parviflora, and Parietaria officinalis; (2) by anomalous development 

 of leuticels, as Goldfussia glomerata, 8aUx rubra, and Samhuous nigra; (3) by 

 fall of leaves, as in case of Mimosa pudica and others; or (4) by limitation of 

 anthocyauin-formation in Strohilanthes dyerianus. 



A case of chronic poisoning of fruit trees by factory smoke, R. Nasini, 

 G. CuBONi, and O. Mattieolo {Pcrizia Giudiziaria. Torino, 1911, pp. 82+3; 

 rev. in Internat. Inst. Agr. [Rome], Bui. Bur. Agr. Intel, and Plant Diseases, 3 

 {1912), No. Jf, pp. 1 J/5-1 0Jt9).— This is a study of the cumulative effects on the 

 sweet orange (Citrus sinensis) of poisoning by sulphur dioxid in factory smoke. 

 Details of the injuries are given, also recommendations for the protection of 

 the trees. 



FIELD CROPS. 



The Woburn field experiments, 1910, J. A. Voelckeb {Jour. Roy. Agr. Soc. 

 England, 71 {1910), pp. 322-343). — This continues work previously noted (E. S. 

 R., 23, p. 632). The season of 1910 was unfavorable, tbe land wet and cold, 

 and germination much delayed. 



On the plats on which wheat and barley have been grown continuously the 

 thirty-fourth year's yields on the check plat averaged 14.1 and 13.5 bu. per 

 acre, respectively, as compared with 25.1 and 11.7 bu. after rape dust equiva- 

 lent to 25 lbs. of ammonia ; 24.1 and 20.3 bu. after mineral manures and sul- 

 phate of ammonia equivalent to 25 lbs. of ammonia on the plats to which 1 ton 

 of lime had been added in 1905 ; and 27.8 and 31.5 bu. after mineral fertilizers 

 and nitrate of soda equivalent to 50 lbs. of ammonia. 



In rotation tests, the plat of swedes fed off by sheep that received decorti- 

 cated cotton cake in addition produced a little more barley than tbe check 

 plats, but the plat on which sheep were fed corn meal produced the lowest 

 barley yield in this portion of the test. When cattle were similarly fed, there 

 was little difference in yield on the cotton cake and corn meal plats, but each 

 produced 4 or 5 bu. more than the check plats. In another rotation, the wheat 

 yield following mustard during the fourth year after the cotton cake and corn 

 meal had been fed on the land indicated that the residual effects of the manure 

 had been practically exhausted by this time. With a third rotation, using 

 sheep the yield of swedes after wheat was somewhat lower on the corn and 

 cotton cake plats than on the check plats, but with cattle the swede yield was 

 about 2i tons per acre greater on the cotton cake plat than on the check plats, 

 while the corn-meal manure apparently gave no profit. In a fourth rotation, 

 mustard after barley gave a lower average yield on the corn meal and cotton 

 cake plats than on the check plats. 



Mustard and rape plowed under as green manures were followed by much 

 higher wheat yields than were vetches and each of the three was followed by 

 a considerably higher yield when plowed under with lime than with mineral 

 manures. This difference in favor of lime had not been noted in the earlier 

 years of this test and may be due to the depletion of the lime content of the 

 soil. The indication of the superiority of mustard as green manure, however, 

 is in harmony with the results of earlier experiments. 



In 1910, as in each of the 4 previous years of the test, a Canadian alfalfa 

 seed gave markedly higher yields than did two other varieties designated as 

 Provence and American. 



An application of 2 tons of lime was followed by a yield of 38.1 bu. of wheat 

 as compared with 37 bu. on the no-lime plat, and 42.1 bu. on the plat which 

 received 10 cwt. of ground lime in 1907 and the same amount in 1909. 



