C. Crowthp:r and A. G. Ruston 



L'(t3 



pronounced on the plots receiving "complete" artificials. Other well- 

 defined changes efiected by the application of dung are the encourage- 

 ment of Dactylis glomerafa, Ahpeairus jwatensis, Avena flavescens, 

 Broimis iHollis and the large umbelliferous weeds Heradeum sphondylium 

 and Anihriscus sylvestris. 



On the "artificials" plots (7-12) BadijJw glomerala and Agrostis 

 vulgaris are conspicuous grasses, whilst Runiex acetosa is a prominent 

 weed; Alopecurus pratensis and Bromus mollis have made no headway, 

 whilst Avena flavescens is prominent only on Plot 7 (nitrate, super- 

 phosphate, kainit) and Plot 9 (nitrate, superphosphate) ; the umbelli- 

 ferous weeds are practically absent. 



On comparing the nitrate plots (7, 9, 11) with the ammonia plots 

 (8, 10, 12) it will be seen that the use of nitrate has apparently 

 encouraged, or at least sustamed, Alopecurus pratensis, Dactylis glome- 

 rata, Avena flavescens, and Runiex acetosa and has repressed Agrostis 

 vulgaris. It is interesting to note that the use of ammonium sulphate 

 along with superphosphate (Plots 8 and 10) has very greatly checked 

 the growth of Rumex — a weed whose presence in appreciable amount is 

 commonly regarded as indicative of acidity or "sourness" in the soil. 



The general character of the herbage may perhaps be conveniently 

 summarised as follows, using a purely arbitrary classification of the 

 grasses : 



* See note to Table III. 



f Figures in brackets refer to samples taken in 1914. 



J Averages of Plots 1 and 13 in 1914 crop. 



