GRASS FOR HAY 



21 



Table XI. — Produce of Hay per acre. Average over the period of 57 years (1856- 

 1912), the 10 years (1903-1912), and the individual year 1912. Rothamsted. 

 Total of first and second crops (if any). 



Plot. 



3 



12 

 2 



5-1 



5 

 17 



4-1 



8 



7 

 6-2 



6 



15 



4-2 

 10 



11-1 



11-2 



16 



14 



Abbreviated Description 

 of Manures. 



Averages over 



57 years 

 (1866-1912). 



y Unman ured every year . . . . ^ 



Unraanured; following Farmyard Dung for first 

 8 years 



(N. half) Unraanured ; following Ammonium-salts 

 alone for 42 years 



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

 yard Dung for first 8 years .... 

 Ammonium-salts alone = 86 lb. Nitrogen (to 1897) 

 Nitrate of Soda alone = 43 lb. Nitrogen 



Superphosphate of Lime 



Mineral Manure without Potash .... 



Complete Mineral Manure 



(S. half) Complete Mineral Manure; following 



Ammonium-salts alone for 42 years . 

 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 . 



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



Mineral Manure (without Potash^), and Ammo- 

 nium-salts =86 lb. N 



Complete Mineral Manure and Ammonium-salts 

 r.86lb. N 



Complete Mineral Manure and Ammonium-salts 

 = 129 lb. N 



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



Complete Mineral Manure and Nitrate Soda 

 = 43 lb. N 



Complete Mineral Manure and Nitrate Soda 

 = 86lb. N 



Cwt. 

 20-9 

 23-9 



28-6* 



14-4tt 



35 -91 

 (26-1)** 

 33-71T 



21-611 



28-0 



40-9 



23-2tt 



37 -2^ 



36 •8§ 



33-511 



47-7 



54-3 



66-5 

 73-3 



46-311 

 56-91i 



10 years 

 (1908.1012). 



Cwt. 

 16-2 

 21-0 



20-2 



15-0 



26-8 



33-2 



21-0 

 27-4 

 50-9 



21-9 



45-3 



45-8 



34-5 



40-5 



54-7 



71-2 

 79-3 



48-1 

 57-7 



Season 

 1912. 



Cwt. 

 10-2 

 20-1 



15-4 



7-1 



23-6 



31-2 



17-2 

 22-5 

 46-4 



15-8 



37-8 



37-0 



25-1 



32-5 



36-0 



67-2 

 72-6 



40-7 

 52-9 



Including Potash first 6 years. 



After the change. 



Before the change, 42*9 cwt. 

 „ 49-5 cwt. 



„ 80'6 cwt. 



„ 85-4 cwt. 



II 54 years only (1859-1912). 

 ^ 55 years only (1858-1912). 

 ** 42 years (1856-1897). 

 tt 16 years (1898-1912). 



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 



B 2 



