THE PARK 



19 



THE PARK 



Grass Land Mown for Hay every Year 



The experiments upon grass at Rolhamsted 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. 



-Manuring of the Permanent Grass Plots per acre per annum, 

 1 856 and since. 



Plot. 



12 

 2 



5-1 



1 



5 

 17 



4-1 

 8 

 7 

 5-2 



15 



4-2 

 10 



11-1 

 11-2 



16 

 14 



Abbreviated Description 

 of Manures. 



^Unmanured every year . . . . 

 Unraanured ; following Dung first 8 years . 



(N. half) Unmanured; following Am- 

 monium-salts alone for 42 years 



Ammonium-salts alone ; with Dung also 

 first 8 years 



Ammonium-salts alone (to 1897) 



Nitrate of Soda alone 



Superphosphate of Lime .... 

 Mineral Manure without Potash 

 Complete Mineral Manure .... 

 (S. half) Mineral Manure following Am- 

 monium-salts alone for 42 years 

 As Plot 7; Ammonium-salts alone first 13 



years 

 As Plot 7 



Nitrate Soda alone first 18 years 



Superphosphate and Ammonium-salts 



Mineral Manure (without Potash) and Am- 

 monium-salts 



Complete Mineral Manure and Ammonium- 

 salts. 



Complete Mineral Manure and Ammonium- 



As Plot 11-1*, and Silicate oif Soda ! '. 



Complete Mineral Manure and Nitrate Soda 

 Complete Mineral Manure and Nitrate Soda 



Nitrogenous 

 Manures, 



Lb. 



II 



Lb. 



200 

 400 



400 



400 



400 



600 

 600 



275 



Mineral Manures. 



275 

 550 



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 



-a, 



Lb. 



500 



500 



500 

 500 



500 



500 

 500 



600 

 600 





GQ 



Lb. 



^250 

 100 



100 

 100 



*250 



100 



100 

 100 



100 

 100 



^4 



n 



o 

 Lb. 



100 

 100 



100 

 100 



100 



100 



100 

 100 



100 

 100 





Lb. 



400 



Reduced in 1905 to 100 lb. 



