GRASS FOR HAY 



27 



(slacked); and the western half, which had in 1883 received 2000 lb., 

 received another 2000 lb. per acre. 



In January 1903 the plots were divided transversely, and a 

 dressing of 2i'00 lb. per acre of quicklime (ground) was applied to 

 the south half of Plots 1 to 4-2, 7 to 11-2, 13 and 16, and this dressing 

 was repeated in January 1907. 



The results of the 1903 dressing are given in Tables XIII. and XIV., 

 and show that distinct improvement is effected on the unmanured plot 

 and those receiving sulphate of ammonia, viz.. Plots 2, 3, 4-2, 9, 10, and 

 11-1. The effect of the liming had largely worn off" in the fourth year 

 after the application, excepting on Plots 9 and 11-1. 



ROTHAMSTED PARK HAY 



Table XIV. — Effects of Lime and the ordinary Manures. Mean of 3 years^ 1904-6 

 {first crops). Produce and Botanical Composition of the Herbage. 



Changes in the Herbage following changes in Manuring. 



Plot 6 was up to 1868 manured with ammonium-salts alone, like the 

 adjoining Plot 5 ; the ammonium-salts were then replaced by a complete 

 mineral manure containing potash. The result is seen in the way 

 leguminous plants have gradually invaded the plot until they now 

 predominate, as they do on Plot 7, where mineral manures have been 

 used throughout. The southern half of Plot 5 has also been manured 

 with minerals instead of ammonium-salts since 1898, and the gradual 

 invasion of leguminous plants may now be seen in progress. The northern 

 half of Plot 5 has been unmanured since 1898, when the ammonium-salts 

 were discontinued, and the invasion of the leguminosae is much slower. 



On Plot 15 nitrate of soda was applied up to 1875, when a change to 

 a complete mineral manure was made, with the same result of the incoming 

 of the leguminous plants. 



Plot 18, which up to 1905 was in an impoverished condition, has 

 since been receiving a complete manure except that phosphates are 

 omitted. 



