COMPETITION OF PLANIS IN CI.'ASS LAND i:,:{ 



deep 1)1' shalK)W root system will (U'ti'iiiiiiic lo wliicii iii.niiirt' 

 tlie grass will respond. The aspect of any meadow represents 

 the results of severe competition among the various sprciis 



Table LVIII. — Avcnufc prodiu-e of Hay per ncrc over (he four sii>,,s.-.tri- 

 lO-i/('(ir jxriods, and the suhscqticyif 8 years, from 1856 - 1003. 

 Rothamsted. First crops only. 



Abbreviated Description 

 of Manuring. 



4-1 



V Unraanured every year 



Ammonium-salts alone ; with Dung also first 

 8 years 



Superphosphate of Lime alone 

 Mineral Manure without Potash * . 

 Complete Mineral Manure . . . . 



17 I Nitrate of Soda alone = 43 lb. N. . 



4-2 SuperphosphateandAmmonium-salts^So Ib.N 

 10 Mineral Manure (without Potash),* and Am- 

 monium-salts =^o lb. N. . 

 9 Complete Mineral Manure and Araraoniura- 



salts = S6 lb. N 



11-1 Complete Mineral Manure and Ammonium- 

 I salts = 129 lb. N 



16 . Complete Mineral Manure and Nitrate Soda 



I =43 lb. N 



14 Complete Mineral Manure and Nitrate Soda 



I =86 lb. N 



Averages over 



Cwt. 

 22-6 

 2.T-1 



24-4+ 



33-6 



33-9 



34-3: 



39 -61 



52-8 



53-6 



61-7 



48-i; 



53-i: 



Cwt. 

 20-0 

 22-9 



21-3 

 26-6 

 36-8 



33-5 



30-5 



39-6 



48-4 



53-6 



47-6 

 60-5 



Si 



Cwt. 

 17-5 

 18-0 



19-1 

 21-8 

 32-3 



30-1 



30-4 



38-6 



50-5 



48-5 



41-0 

 53-8 



Including Potash, lirst 6 years. 



Seven years only (1859-65). 



J Eight years only (lSi8-65). 



represented; the dominant species are tho.sc most suited to 

 their environment, l.<\, to the amount and nature of the ])lant 

 food in the soil, the water supply, the texture of the soil, 

 and other factors. If any of these factors lie altered, as 

 is done in the case of the Rotham.sted i)lots l>y iiiaiiuriii;^ i" 

 dififerent fashions, the original equilibrium hetwccn I In- eon- 

 tending species is disturbed; some species are liivomcd, and 

 increase at the expense of the others until a new eciuilibrium 

 is attained, and the general character nf th.' herbage from 

 the botanical point (jf view is completely altered. Tt tlius 



