THE PARK 



17 



THE PAEK 



Grass Land Mown for Hay every Year 



The experiments upon grass at Rothamsted began in 1856, about 7 acres 

 of the park close to the house being set aside for the purpose. The land 

 has been in grass as long as any recorded history of it exists, for some 

 centuries at least. It is not known that seed has ever been sown, and at 

 the beginning of the experiments the herbage on all the plots was 

 apparently uniform. 



The plots, of which there are twenty in all, vary somewhat in size, 

 which lies between one-half and one-eighth of an acre. Up to 1874 in- 

 clusive the grass was only cut once, the aftermath being fed off* by sheep. 

 Since that time there has been no grazing, and the plots are generally cut 

 twice in the year. The grass is made into hay in the usual way, and the 

 whole produce of each plot is then weighed. 



Table X.— 



oj the Permanent Grass Plots per acre per annum, 

 1856 and since. 



Plot. 



4-1 

 8 

 7 



6 



15 



5 

 17 



4-2 

 10 



9 



13 



11-1 



11-2 



16 

 14 



Abbreviated Description 

 of Manures. 



VUnmanured every year 



Unmanured ; following Dung first 8 years . 



Ammonium-salts alone; with Dung also 



first 8 years 



Superphosphate of Lime .... 

 Mineral Manure without Potash . 

 Complete Mineral Manure .... 



As Plot 7 ; Ammonium-salts alone first 13 



years 



As Plot 7 ; Nitrate Soda alone first 18 years 



Ammonium-salts alone (to 1897) . 



Nitrate of Soda alone 



Superphosphate and Ammonium-salts 

 Mineral Manure (without Potash) and Am- 

 monium-salts 



Complete Mineral Manure and Ammonium- 



As Plot 9, and Chaffed Wheat Straw also 

 to 1897 



Complete Mineral Manure and Ammonium- 

 salts 



As Plot 11-1, and Silicate of Soda 



Complete Mineral Manure and Nitrate Soda 

 Complete Mineral Manure and Nitrate Soda 



Nitrogenous 

 Manures. 



II 



Lb. 



200 



400 



400 



400 



400 



400 



600 

 600 



^« 



Lb. 



275 



275 

 550 



Mineral Manures. 



Cwt. 



3-5 

 3-5 

 3-5 



3-5 

 3-5 



3-5 



3-5 



3-5 



3-5 



3-5 

 3-5 



3-5 

 3-5 



ai .£3 



Lb. 



500 



500 

 500 



500 



500 



500 

 500 



500 

 500 



Lb. 



*250 

 100 



100 

 100 



*250 



100 



100 



100 

 100 



100 

 100 





Lb. 



100 

 100 



100 

 100 



100 



100 



100 



100 

 100 



100 

 100 



^1 



Lb. 



400 



Reduced in 1905 to 100 lb. 



