400 
Clover as a Preparatory Crop for Wheat. 
Avould have to be described as about the most exhausting crop in 
the entire rotation. 
Clover-hay on an average and in round numbers contains in 
100 parts :— 
Water 17-0 
*Nitrogcnous substances (flesh-forming matters) .. 15*6 
Non-nitrogenous compounds 59'f) 
Mineral matter (ash) 7*5 
100-0 
* Containing nitrogen 2*5 
The mineral portion or ash in 100 parts of clover-hay con- 
sists of — 
rhosphoric acid 7'5 
Sulphuric acid 4'3 
Carbonic acid 18-0 
Silica 3-0 
Lime 30-0 
Magnesia 8*5 
Potash 20-0 
Soda, chloride of sodium, oxide of iron, sand, loss, &c. 8'7 
100-0 
Let us suppose the land to have yielded 4 tons of clover-hay 
per acre. According to the preceding data we find that such a 
crop includes 224 lbs. of nitrogen, equal to 272 lbs. of ammonia, 
and 672 lbs. of mineral matter or ash constituents. 
In 672 lbs. of clover-ash we find : — 
I'hosphoric acid 51 5 lbs. 
Sulphuric acid 29 
Carbonic acid 121 
Silica 20 
Lime 201 
Magnesia 57 
Potash 134i 
Soda, chloride of sodium, oxide of iron, sand, &c. 58 
672 lbs. 
Four tons of clover-hay, the produce of one acre, thus contain 
a large amount of nitrogen, and remove from the soil an enor- 
mous quantity of mineral matters, abounding in lime and potash,, 
and containing also a good deal of phosphoric acid. 
Leaving for a moment the question untouched whether the 
nitrogen contained in the clover is derived from the soil or from 
the atmosphere, or partly from the one and partly from the other, 
no question can arise as to the original source from which the 
mineral matters in the clover-produce is derived. In relation, 
therefore, to the ash-constituents, clover must be regarded as one 
