l')-21.] 



Improvement of Grazed Pastures. 



239 



IMPROVEMENT OF 

 GRAZED PASTURES BY MANURING. 



T. J. Jenkin, M.Scv, 

 IJtiircrsiti/ College of Wcdes, Ahenisiirijth. 



General conclusions obtained from the results of a series 

 of experiments on the improvement of hill and peaty pastures 

 laid down by the Department of Agriculture, University 

 College of North Wales, Bangor, have been published by that 

 Department in pamphlet form.* 



These experiments were made in 1918, 1914 and 1915, and 

 were all on a unifoiTn plan, as shown in Table I. 



Tabl3 I. — Plan oi Experiments. 



Manure yer Acre. 



Pl.)t I. 10 cwt. Basic Slag, 42 per cent, total phosphate, 33-G per cent, 

 citric soluble phosphate. 

 II. 10 cwt. Ground Gafsa Phosphate, G2 per cent, total phosphate, 

 22*4 per cent, citric soluble phosphate. 

 „ III. G cwt. Superphosphate, 30 per cent, phosphate. 

 „ IV. No Manure. 

 ^ V. Superphosphate as for Plot III, with the addition of 20 cwt. 



Ground Lime. 

 ., VI. 20 cwt. Ground Lime. 

 ,, VII. 3G cwt. Ground Limestone. 



The plots were also cross-dressed with a potassic manure, 

 viz., IJ cwt. sulphate of potash ]^er acre in the earliest experi- 

 ments and 6 cwt. of kainit per acre in the later experiments. 



These experiments were made at a num])er of centres 

 throughout North Wales. Although valuable results were 

 obtained, at most of the centres the ground was not sufficiently 

 uniform to give reliable results from botanical analyses. Only 

 at five centres, therefore, were botanical analyses of the 

 herbage made, all primarily in the fourth summer of the 

 experiments. At one of the centres, the 'csults were practi- 

 cally nil, while the botanical results only showed that 

 leguminous plants were entirely absent from the herbage. 



At a second centre, where the soil was a neutral peat and 

 the herbage approximately that oi the fen type, there was no 

 change which might be considered to be an agricultural 



* The latest ])amphlet, " The Improvement of Ron^h Pasture," was issued 

 early in 1920. The writer is indebted to Professor R. G. White for particulars 

 ot these experiments. Tlic work here recorded was done while the writer 

 was attached to the Department of Agriculture at Ran<;or. 



