THE INFLUENCE ON CROP AND SOIL OF 

 MANURES APPLIED TO PERMANENT MEADOW. 



By CHARLES CiROWTHER and ARTHUR G. RUSTON. 



(Department of Agriculture, The University, Leeds.) 



The observations which form the basis of the present communication 

 have been made in connection with a comparative test of different 

 systems of manuring meadow land which lias been carried on con- 

 tinuously and uiiifoi'mly since 1899 at the Manor Farm, Garforth^. 

 Precisely similar tests were made for several years at five other centres 

 in the West Riding of Yorkshire, the tests being continued at three 

 centres for eight years. At Garforth the plots still continue to be 

 manured in accordance with the original scheme. 



This scheme was designed to test the following points: 



(a) The effects of an annual dressing of dung. 



(h) The effects of a dressing of dung every two years. 



(f) The effects of alternate annual dressings of dung and various 

 artificial manures. 



{il) The effects of "complete" and "incomplete" mi.xtures of 

 artificial manures. 



(i?) The comparative effects of nitrate of soda and sulphate of 

 ammonia. 



The detailed scheme of manuring is given in Table I. 



The soil of these plots at Garforth is a dry, light loam, poor in lime, 

 resting upon sandstone in the Middle Coal Measures series. The plots 

 are each ^',yth acre in extent. Dimg is applied usually in March, but 

 occasionally earlier. Superphosphate and kainit are applied usually 

 in March, sulphate of ammonia in March to early May, and nitrate 

 of soda in late April or early May. 



• Experimoiital Farm of tlip University of Leeds and tlie Yorkshire Council for 

 Agricultural Education. 



