FIELD CROPS, 837 



Sulphate of ammonia gave 2.31 tous and nitrate of soda 1.31 tons of cane 

 more per acre than calcium cyanamid, when all were applied at such rates as 

 to supplying 60 lbs. of nitrogen per acre. 



Experiments conducted to ascertain the effect, if any, of cutting out dead 

 hearts resulted in a yield of 672 lbs. of sugar cane less when the dead hearts 

 were cut out than when they were allowed to remain. 



Seedling' canes and manurial experiments for the season 1909—1911 (Local 

 Dcpt. Agr., Barbados, Seedling-Canes and Manurial E.rpis., 190D-W11, pp. 65).— 

 This gives a fuller report of the sugar-cane work referred to above, and sum- 

 marizes the results of IS years' manurial experiments at Dodds. 



Better results- were obtained by planting cuttings made from plant canes 

 than when cuttings from first ratoon canes or seventh ratoon canes were used 

 or when the small cuttings were used from these 3 tests. 



[Variety and manurial tests with sugar cane], H. H. Cousins (Rpt. 

 Jamaica Sugar Expt. Sta., 3 (1908-1910), pp,. 1-107, i)Is. ii).— This is a report 

 of the results of manurial and variety tests conducted on a number of estates. 



Manurial experiments, F. Watts et al. (Imp. Dept. Agr. West Indies, Sugar- 

 cane E.rpts. Leeward Isl. 1909-10, pt. 2, pp. 35, pis. 2). — This is a detailed 

 report in tabular form of a continuation of manurial tests with sugar cane at 

 Antigua and St. Kitts, already noted (E. S. R., 21, p. 540). 



Experiments with varieties of sugar cane, P. Watts et al. (Imp. Dept. Agr. 

 West Indies, Sugar-cane Expts. Leeward Isl. 1909-10, pt. 1, pp. 81). — This is a 

 similar report of the results of variety tests with plant and ratoon canes, in 

 continuation of work already noted (E. S. R., 21. p. 540). 



Beport on field trials with varieties of swedes in 1909, T. Milburn (2Iid- 

 land Agr. and Dairy Col. Bui. 8, 1909-10, pp. 73-80).— This is a report of the 

 third year's results in a variety test of swedes. Ten varieties were tested in 4 

 different localities. The author does not regard any variety as having shown 

 special merit, although satisfactory yields were given by most of the varieties. 

 Their dry matter percentages ranged fi'om 7.95 to 9. 



Results of field trials on the manuring of swedes in the year 1910, E. E. 

 Stokes (Midland Agr. and Dairy Col. Bui. 7, 1910-11, pp. 43-47, table i).— Six 

 years' work have indicated that the most profitable fertilizer for swedes is 150 

 lbs. sulphate of ammonia, 500 lbs. superphosphate, and 60 lbs. sulphate of potash. 

 Sulphate of ammonia proved a more profitable nitrogen source than nitrate of 

 soda, and superphosphate proved more profitable than dissolved bones, bone 

 meal, or basic slag. Sulphate of potash excelled both kainit and muriate of 

 potash. 



A new series of experiments was conducted on the 11 plats at each of 5 centers 

 during 1910. One of its minor objects was the testing of nitrate of lime as a 

 nitrogen source. Although the author regards it as misleading to draw con- 

 clusions at this stage, he states in full the yields and other data secured in this 

 test. The greatest average profit per acre in 4 of the localities followed the use 

 of (1) 230 lbs. nitrate of lime, 500 lbs. superphosphate, and 60 lbs. sulphate of 

 potash, and (2) 250 lbs. Charleston phosphate alone. 



Results of field trials on the manuring- of swedes in 1909, T. Milburn 

 (Midland Agr. and Dairy Col. Bui. 4, 1909-10, pp. 41-49).— ThQ results of work 

 begun in 1904 are summarized, including the sixth year's work. 



Types of Cuban tobacco, H. Hasselbring (Bat. Gas., 53 (1912), No. 2, pp. 

 113-126, pis. 7). — The author finds that the tobacco grown in Cuba consists of a 

 mixture of a large number of forms which maintain their characteristics from 

 generation to generation. The crop in any one field lacks uniformity and the 

 plants show a bewildering variety of forms among which some types predom- 



