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Note on the fertilizing efficacy oj Greensand, extracted from the re- 

 port on the Geology of New Jersey, by Professor H. D. Rogers ; 



" Mr. Woollcy, of Poplar swamp, Monmouth county, N. J., 

 manured a piece of land in the proportion of 200 loads of good 

 stable manure to the acre, applying upon an adjacent tract of the 

 same soil, his marl, in the ratio of about 20 loads per acre. The 

 crops, which were timothy and clover, were much the heaviest 

 upon the section which had received the marl, and there was this 

 additional fact greatly in favour of the fossil manure, over the 

 putrescent one, that the soil enriched by it was entirely clear of 

 weeds, while the stable manure had rendered its own crop extremely 

 foul. 



« There can be no doubt that 20 loads of marl per acre must be 

 regarded as an unnecessarily bountiful dressing, but computing the 

 relative cost of the two manures when employed in the ratio above 

 stated, we find a considerable disparity of expense in favour of the 

 greensand. Placing the home value of farm-yard manure at 100 

 cents for each two horse load, and that of the marl at 25 cents 

 per load, we have the expense of manuring one acre 20 dollars, of 

 marling the same 5 dollars. 



"Experience has already shown that land once amply marled, 

 retains its fertility with little diminution for at least 10 or 12 years, 

 if care be taken not to crop it too severely ; while with all practi- 

 cable precautions, the stable manure must be renewed at least three 

 times within that interval, to maintain in the soil a corresponding 

 vigour." 



