304 The Wohurn Field Experiments, 1912. 



July 2-10 — and rape was drilled, but it grew very slowly, 

 and did not give enough crop to feed on ; so it was ploughed 

 in in October, and wheat was sown. 



{h) Series D. 1912, Swedes. 



This was the first crop of the new series on this land. The 

 general plan of the experiment was set out in the Report for 

 1911 (Journal R.A.S.E., Vol. 72, 1911, pp. 394-5). From May 20 

 to June 8 dung was carted out and applied to the land, at the 

 rate of 12 tons per acre. Three hundredweight of superphos- 

 phate and 1 cwt. of sulphate of potash per acre were then given 

 as artificial manure for the swedes, and on June 8 swede seed 

 (" Invicta ") was drilled. The plant came up well, and the 

 crop was singled and set out on July 6. On July 25 a top- 

 dressing of 1 cwt. per acre of sulphate of ammonia was given. 

 Through the wet autumn the crop maintained itself well, there 

 being a very even plant throughout. The swedes were pulled 

 November 26-27 and weighed, the results being : — 



Weight of roots 

 per acre 



T c. q. lb. 

 Half plot, swedes to be subsequently fed on with cake 14 2 24 

 Half plot, ,, „ „ „ „ corn 16 15 



These amounts were reduced so as to leave 12 tons per acre 

 to be fed on each plot, the surplus swedes being carted off. 



Green-manuring Experiments. 



(a) Stackyard Field. Series A. 



The two acres on which the green crops (mustard, rape, and 

 tares) had been grown in 1911 and fed on the land by sheep 

 (in contradistinction to Lansome Field, where the green crops 

 are ploughed in) were ploughed up October 23-25, 1911, and, as 

 the land still needed liming, 1 ton per acre of ground lime 

 (Buxton) was given on November 25 to the upper part, and 

 2 tons of lump lime (Buxton) to the lower half. On 

 December 4, 9 pecks of-" Square Head's Master" wheat per 

 acre were sown over the whole area, and on December 8, 

 4 cwt. of superphosphate and 1 cwt. of sulphate of potash 

 per acre were given. The wheat came up well and was quite 

 a fair crop for the year, though there was little difference 

 noticeable between the different portions. The wheat was cut 

 on August 13, 1912, carted and threshed on September 3. The 

 results are given in Table IV. As the upper and lower halves 

 of the field were kept separate, the individual weights are given, 

 the a plots (la, 2a, 3a) being at the lower end of the field and 

 the others at the upper end. 



