GRASS FOR HAY 



19 



Table XI. — Produce of Hay per acre. Average over the period of 47 years 

 (1856-1902), the 10 years (1893-1902), and the individual year 1905. 

 Rothamsted. Total of first, and second crops {if amy). 



Plot. 



Abbreviated Description 

 of Manures. 



Averages over 



47 years 

 (1856-1902). 



10 years 

 (1893-1902). 



1905. 



4-1 



8 



7 



15 



5 

 17 



4-2 

 10 



13 

 11-1 

 11-2 

 16 

 14 



J- Unmanured every year \ 



Unmanured; following Farmyard Dung for first 

 8 years 



Ammonium-salts alone ( = 43 lb. N.); with Farm- 

 yard Dung for first 8 years .... 



Superphosphate of Lime 



Mineral Manure without Potash .... 

 Complete Mineral Manure 



Complete Mineral Manure as Plot 7 ; following 

 Ammonium-salts alone first 13 years 



Complete Mineral Manure as Plot 7 ; following 

 Nitrate of Soda alone first 18 years . 



Ammonium-salts alone =86 lb. Nitrogen 

 Nitrate of Soda alone = 43 lb. Nitrogen . 



Superphosphate and Ammonium-salts = 86 lb. N. . 



Mineral Manure (without Potash), and Ammo- 

 nium-salts = 86 lb. N 



Complete Mineral Manure and Ammonium-salts 

 = 86lb. N 



As Plot 9, and Chaffed Wheat Straw also to 1897 

 inclusive 



Complete Mineral Manure, and Ammonium-salts 

 = 129 lb. N 



As Plot 11-1, and Silicate of Soda .... 



Complete Mineral Manure and Nitrate Soda 

 = 43lb. N 



Complete Mineral Manure and Nitrate Soda 

 = 86lb. N 



Cwt. 

 21-9 

 24-5 



27-9* 



35 -41 



23 •3§ 



28-1 



38-8 



37-4t 

 37-011 

 (26-1)** 



35 -Sir 



35 •5§ 



49-3 



54-1 



62-5** 



65-5 

 72-0 



48-011 

 59-31F 



Cwt. 

 15-9 

 18-5 



17-4 



24-9 



17-8 

 21-6 

 36-5 



36-0 

 40-8 



30-6 

 28-3 

 38-1 



46-8 



64-6 

 68-0 



42-4 

 53-4 



Cwt. 

 19-4 

 24-7 



23-2 



26-3 



22-3 

 30-3 

 52-9 



46-1 

 51-9 



39-7 

 31-5 

 37-3 

 48-6 



59-0 

 74-5 



52-3 

 57-6 



* After the change. Before the change, 42*9 cwt. 



t „ „ 49-5 cwt. 



X „ „ 30-6 cwt. 



il „ „ 85-4 cwt. 



§ 44 years only (1859-1902). 

 ^ 45 years only (1858-1902). 

 ** 42 years (1856-1897). 



The Unmanured Plots 



Two of the plots have remained without manure during the whole of 

 the experiment. They are situated near the extremities of the field, and 

 show a slight but constant difference in crop. Taking the average of the 

 whole period, these unmanured plots have produced rather more than a 

 ton of hay per acre per annum. If we compare the successive ten-year 

 returns, there is no sign of approaching exhaustion or great falling-off in 

 crop from year to year. The impoverishment of these unmanured plots is 

 more to be seen in the character of the herbage than in the gross weight 

 of produce. Weeds of all descriptions occupy the land, and the relative 

 proportion they bear to the grasses and clovers has increased from year to 



