69 



K.\pcr'niie}its with Potassic Fertilisers on Potatoes 



(Lansome Field), 192^. 



Produce per acre. 



the crop, the actual removal from the heaps and sale only began in 

 the middle of March, 1922, and continued till the close of May. 

 Hence a division of the crop into the three sections would give no 

 fair comparison, as the shrinkage in weight owing to storage, 

 sprouting, etc., would vary with the time of keeping. 



It may, however, be said that there was, on the average, no 

 difference between sulphate of potash and muriate of potash either 

 in respect of "seed" — which worked out at 7% — or of "diseased" 

 — which did not exceed 1%. 



The duplicates, with the exception of plots 2 and 4, agreed very 

 fairly. Muriate of potash gave, on the average, 10 cwt. per acre 

 more yield than did the same amount of potash as sulphate. Also 

 the yield was 1 ton per acre more where, in place of farmyard 

 manure, additional superphosphate and sulphate of ammonia 

 were used. 



The crop all round was a splendid one ; it gave but few diseased 

 tubers, and, after being pitted, it kept well throughout the winter 

 and right on to May, 1923. 



POT-CULTURE EXPERIMENTS, 1922. 



Though the transference to Cambridge of the work hitherto 

 done at Woburn under the terms of the Hills' bequest, brought to 

 an end my official connection with this, yet the experience I had 

 derived during a period of 25 years, and the interest I felt in the 

 methods of enquiry pursued, determined me to carry on the ex- 

 periments so far as I found this possible. Similarly, the many 

 enquiries that had been initiated and were still in progress in 

 connection with the Woburn field experiments rendered it desirable 

 that these, too, should be continued. This I have succeeded in 

 doing, and the present is an account of the work carried on m 

 1921-22. 



