8o BOARD OF AGRICULTURE. [Jan., 



ence in the power of the two cereals to resist acidity. Later ex- 

 periments showed, in full agreement with those in Rhode Island, 

 that oats could resist the conditions much better than either 

 wheat or barley. 



The two plats now shown were embraced in the Woburn 

 experiment with the ammonium salts. The plat at the right, 

 where little barley is to be seen, had not been limed, while that 

 at the left, where there is a fine crop, received two tons of lime 

 per acre, about three years before this view was taken. It will 

 he seen that the lime has fvdly corrected the ill effect of the am- 

 monium salts. 



Where certain mineral manures were used with the am- 

 monium salts the injury from the latter was longer delayed and 

 was slisfhtlv less serious than when it was used alone. Here 

 also the addition of lime corrected the condition. 



Recently A. D. Hall, Director of the Rothamstead Station, 

 mentioned the bad influence of the continual use of the two 

 ammonium salts which have just been mentioned, and says 

 that sorrel became abundant upon the plats which received 

 them, excepting where carbonate of lime had been applied. 



A more striking illustration could hardly be afforded of the 

 influence of soil conditions upon the relative amounts of sorrel 

 and clover than that afforded by the plats in the nitrogen ex- 

 periment at the Rhode Island Station. Where mineral 

 manures only were used there was no clover upon the unlimed 

 sections of the plats, but common sorrel was abundant. Where 

 lime was applied there was a full, splendid stand of clover, 

 with but traces of sorrel. The amount of the common sorrel 

 was less upon the unlimed plat where nitrate of soda had been 

 used than upon the corresponding plat receiving dried blood. 

 By the use of sulphate of ammonia, without lime, the amount 

 of sorrel was three and one-half times as great as with 

 dried blood used under the same conditions. In fact it fully 

 occupied the ground to the utter exclusion of clover and it was 

 nearly knee high. A more magnificent growth of sorrel than 

 was observed in that instance is hardly conceivable. 



