68 



[b] Great Hill. 



Simultaneously with the foregoing, an experiment on an 

 adjoining field of light sandy soil, but entirely on the Lower 

 Greensand formation, was carried out. A light crop of swedes 

 had been fed on this land by sheep, receiving also a little cotton 

 cake. It was desired to see whether mineral superphosphate 

 given in addition proved an advantage to the following barley crop. 



Two plots of |-acre were marked out, and to one of them super- 

 phosphate at the rate of 3 cwt. per acre was given previous to the 

 drilling of barley ("Plumage Archer") on April 25th. 



The crop was cut on September 16th, 1922, and threshed on 

 January 24th, 1923. 



The results were : — 



Malting Barley Experiments (Great Hill) , 1922. 

 Produce of Barley per acre, after Swedes fed off by Sheep. 



On this lighter soil the crop was lower than on Warren Field, 

 but was by no means a bad one for the land. The straw, however, 

 was much shorter, and only about half the yield of Warren Field. 

 The addition of superphosphate did not appear to have increased 

 the yield either of corn or of straw. 



7. Experiments with Potassic Fertilisers {Sulphate and Muriate) 



on Potatoes. 



In 1922, experiments were carried out at W^oburn, in common 

 with other centres, for the purpose of testing the respective in- 

 fluence of sulphate of potash and muriate of potash, on the yield, 

 quality, etc., of potatoes. The field selected at Woburn was 

 Lansome Field, and the variety "Kerr's Pink," the seed ha\ing 

 been obtained direct from Perthshire. 



The soil is a light sandy loam, very suitable for the growth of 

 potatoes. Spraying with Bouillie Bordelaise was carried out on 

 September 1st and 2nd, and a second time on September 20th, 

 though there was but little appearance of disease. It was noticed 

 during growth that the plots treated with muriate of potash were 

 lighter in colour than those with sulphate of potash, and also that 

 the tops were bigger where no farmyard manure had been given. 



The lifting of the crop began on November 15th when the 

 crops were weighed, and the returns are shown on page 69, In 

 this table the weights are recorded as taken when the crop was 

 lifted, whereas the separation into "ware," "seed," and 

 "diseased" was not made until several months later when the 

 potatoes were actually sold. Owing to difficulties in disposing of 



