396 



The Woburn Field Experiments, 1911. 



Experiments with Nitrogenous Top-dressings on 

 Wheat, 1911. 



Series (Z>). Stackyard Field. 



Experiments of previous years had been concerned with 

 wheat, barley, mangolds, potatoes, and oats. In 1911 it was 

 decided to return to wheat, and to extend the inquiry by not 

 merely using nitrate of lime and cyanamide separately, but by 

 employing them also mixed in different proportions. The land 

 used for the purpose was the upper-half of the old Rotation IV., 

 where mustard had been the crop of 1910. The land, after 

 being ploughed, was drilled on October 18, 1910, with 9 pecks 

 per acre of " Square Head's Master " wheat. Along with it 

 was given 3 cwt. per acre of superphosphate and \ cwt. per 

 acre of sulphate of potash. The wheat came up fairly, but, in 

 the beginning of the year, did not look at all well, and the 

 subsequent drought affected it greatly. The different top- 

 dressings were applied on May 16, 1911, but there was little or 

 no rain to dissolve them, and they remained on the surface for 

 a considerable time subsequently. 



The wheat was cut on August 1, and carted on August 9. 

 The results are given in Table V. 



Table V. — Experiment with Nitrogenous Top-dressings 



on Wheat, 1911. 



Stackyard Field — Produce per acre. 



1 In quantity to supply as much nitrogen as that contained in 1 cwt. sulphate of 

 ammonia. 



It will be noticed that the plot which received no nitro- 

 genous top-dressing gave a yield of 16'2 bushels per acre, and 

 that the yield from sulphate of ammonia was one bushel below 

 this. 



