Agricultural Chemistry. 
473 
two leguminous crops (beans and clover) give a very considerable 
average increase ; though in individual years, it was very much 
greater than this Table of averages merely, would indicate. 
A mixture of potass, soda, and magnesia, gave with wheat a 
small average increase ; with the other cereal, barley, there was, 
taking the average, a slight deficiency. But, with beans and 
clover, this supply of alkalies produced a considerable increase, 
Supei'phosphate of lime has given with the cereals a small ave- 
rage increase ; with beans on the average there was a deficiency ; 
with clover a very small increase ; but with turnips, an average 
increase of total produce, of more than 7 tons. 
When to the superphospJiate of lime, potass is added, we get 
scarcely any increase with wheat ; a notable increase with beans, 
though less than when the potass is used alone ; a very consider- 
able increase with clover ; and with turnips, a considerable 
though less amount of average increase than when the super- 
phosphate of lime was used without the potass. 
Nitrate of soda gives with both the cereals, a very considerable 
increase. 
Ammonia-salts also gave with both the cereals a large amount 
of increase ; and in the case of wheat a large increase was ob- 
tained in other soils of very different quality, as well as at 
Rothamsted. These ammonia-salts, however, which with the 
comparatively speaking deficiently nitrogenised cereals, give 
such a large amount of increase — with the highly nitrogenous 
leguminous crops, give in the case of the beans an average of 
only 14 lbs. of increase, and with the clover an actual deficiency. 
And %vith turnips, we have with ammonia-salts alone, only a few 
hundredweights of increase, instead of more than as many tons 
with superphosphate of lime. 
The mixture of superphosphate of lime, with a large amount 
of ammonia-salts, gives a greater increase with botli wheat and 
barley, than the ammoniacal salts alone. With the leguminous 
crops, the mixture of ammonia-salts and superphosphate of lime, 
yields scarcely any beneficial result ; indeed with clover there 
was on the average a deficiency. It should be stated, however, 
that owing to the injurious effects observed on the use of much 
ammonia-salt with the leguminous crops, the quantities employed 
per acre in the cases in question, were much less tlian with the 
cereals. In the turnip experiments, also, much less of these 
salts was found to be appropriate than in the case of the grain 
crops, and less therefore was employed. Although when used 
alone, the ammoniacal salts gave no appreciable result with 
turnips, yet, when mixed with superphosphate of lime, they 
increased the efficacy of the latter manure. Thus, we have with 
the mixture 8j tons of increase of gross produce of turnips, 
