1910.] Summary of Agricultural Experiments. 311 



an almost equally good result was produced by i cwt. sulphate of 

 ammonia, 528 lb. superphosphate (33 per cent, soluble), 160 lb. sulphate 

 of potash, and 128 lb. nitrate of soda, the crop being 43 tons per acre. 



An experiment on the manuring of swedes was carried out at 

 Culmjohn, Rewe, on a medium loam soil. The whole of the field 

 was treated with farmyard manure produced by fattening bullocks, and 

 the addition of artificial fertilisers to this had but little effect. 



The value of calcium cyanamide for turnips was tested on four 

 plots. A mixture of 300 lb. superphosphate with 56 lb. calcium cyan- 

 amide yielded 16 tons per acre ; the same quantities of superphosphate 

 and sulphate of ammonia yielded 13 tons ; 400 lb. of basic slag and 

 56 lb. calcium cyanamide produced rather less than 13 tons. 



Feeding Value of Turnips manured with Basic Slag (Devon Agric. 

 Com., Report on Field Expts., 1907-8). — An experiment was arranged 

 to determine whether the results obtained in Scotland, showing 

 a superior feeding value for slag-grown swedes, would be confirmed 

 in this county. Two half-acres of land were dressed with | cwt. 

 sulphate of ammonia per acre, and one with 6 cwt. superphosphate (25 

 per cent, soluble) per acre, the other with 6 cwt. basic slag (26*3 per 

 cent, phosphate) per acre. The soil was deficient in lime, but had 

 been dressed with ground lime at the rate of half a ton per acre in 

 January, 1909. This liming would make the difference between the 

 acid superphosphate and the basic slag less important. The crops, 

 which were practically equal on the two plots, were fed to sheep, and 

 fifteen sheep fed for five weeks on the slag-grown swedes made a 

 total live weight increase of 80 lb., while fifteen fed on the super- 

 phosphate-grown swedes made 64 lb. The former roots suffered less 

 from finger-and-toe, and were eaten by the sheep with more relish. 



Manuring of Mangolds (Rothamsted Expt. Stat., Report, 1909). — 

 Mangolds have been grown on the Barn Field with the same systems 

 of manuring since 1876, and this report gives the yields obtained in 

 1909. The yield was generally above the average, especially on the 

 plots receiving dung or rape cake. The usual fungoid attack of 

 Uromyces betce on the plots receiving an excess of nitrogen was not 

 so prominent this year. 



Experiments with Potatoes. 



Experiments with "Seed" Potatoes (Univ. Coll. of N, Wales, Bangqr, 

 Bulls. 9 and 10, 1909). — An experiment to show the effect of change of 

 "seed" was carried out by former students of the College in fifteen 

 different districts. There were two plots at each place, Plot 1 being 

 planted with seed fresh from Scotland, and Plot 2 with seed grown 

 on the farm, in most cases for two years. The Up-to-date variety was 

 planted in every instance. 



On the average the new seed produced nearly 2 tons per acre more 

 marketable potatoes than that which had been previously grown on 

 the farms. It is concluded from this that the "seed" should be 

 changed every year, or at the most every other year. 



In 1908 and 1909 a series of experiments was begun with " seed " 

 obtained from various parts of the country, with the view of elucidating 



