GUANO. 187 



regard to the produce yielded by guano, as a guar- 

 anty for the assertion that this manure has proved 

 profitable for all kinds of crops and on all kinds of 

 soil. The fact may suffice, that, according to expe- 

 rience, 1 cwt. of guano is capable of producing 

 in the first year 540 lbs. of rye, from 600 to 800 

 lbs. of barley, or from 820 to 330 lbs. of pota- 

 toes, etc. If the subsequent operation is added to 

 the calculation, it may be affirmed with certainty 

 that 1 cwt. of guano is able to produce 5 Saxon 

 bushels (at least 800 lbs.) of rye, with the corre- 

 sponding quantity of straw (at least 1800 lbs.), of 

 which some 60 per cent, must be reckoned for the 

 first year, 25 per cent, for the second, and 15 per 

 cent, for the third. 



The 30,000 cwt. of guano, which Saxon agricul- 

 ture annually consumes, lead accordingly to an in- 

 creased produce of 150,000 bushels (at 160 lbs.) of 

 grain and 500,000 cwt. of straw, or to a correspond- 

 ing quantity of other crops. 



In comparing- the fertilizing power of guano with 

 that of the excrements of cattle, it may be assumed, 

 from the results of practical experience in Saxony, 

 that 1 cwt. of guano is equivalent to from 65 to 70 cwt. 

 of the latter ; that is, to three full loads. Of bone- 

 dust, 2 to 2 1 cwt. furnished the same result ; guano, 

 however, excels the latter, which is not equally well 

 adapted to all soils, inasmuch as it has a decided 

 advantage in the first year, whilst bone-dust, on the 

 other hand, has a more enduring operation. Hence 



