Expenments with diffprcnt Top-Dressings upon IVIieaf. 105 
succulent than that on the uninanuretl plot, and, as the result 
showed, yielded a considerable increase of corn. 
Plot VII. — Top-dressed April 15th, at the rate of 2 cwt. of 
guano and 2 cwt, of salt per acre, produced : — 
cwt. qrs. lbs. 
Com, Head 53 5 
„ Tail 0 0 3i 
5 3 SJ 
Rtiaw 6 0 16 
Chair 0 2 m 
Cavings 0 1 3 
Produce per acre : — 
Com (head and tail) 43 bushels 30 Ib.s. 
Straw (including chaff and cavings) 1 ton S cwt. 8 lbs. 
The guano used in this and next experiment was {genuine 
Peruvian of superior quality, as will be seen by the following 
analysis : — 
Moisture 17'03 
'Organic matter and salts of ammonia .. .. 52*04 
Phosphates of lime and magnesia 19"61 
Alkaline salts 10-43 
Sand -89 
100-00 
*Containing nitrogen 14-94 
Equal to ammonia 18-14 
Plot VIII. — Top-dressed with Peruvian guano, at the rate of 
3 cwt. per acre, produced : — 
cwt. qrs. lbs. 
Corn, Head .. 5 2 24 
„ Tail 0 0 3 
5 2 27 
Stiaw 6 2 9 
Chaff 0 2 19 
Cavings 0 1 22 
Produce per acre : — 
Corn (head and tail) 42 bu.slicls 52 lbs. 
Straw (including chaff and cavings) 1 ton 10 cwt. 3 qrs. 4 lbs. 
The whole produce from each J acre under experiment was 
threshed out separately and carefully weighed. In stating the 
produce in bushels a uniform weight of 60 lbs. per bushel has 
been assumed ; but in reality the corn on all the plots was 
lighter, and with little variation on the different plots weighed 
58^ lbs. per bushel. 
To facilitate a comparison, the preceding results are embodied 
in the two following tables :—- 
