320 



On Guano. 



20 tons of 

 Farm-yard Manure. 



20 bushels 

 of Bones with 

 Ashes. 



6 cwt. of Guano 



mixed with 

 Chalk or Gypsum. 



6 cwt. of 

 Artificial Guano. 



10 tons do. 

 with 10 bushels of 

 Bone-dust. 



20 cwt. of 

 Rape with Ashes. 



10 tons of 

 Farm-yard Manure 

 with 

 3 cwt. of Guano. 



10 tons of 

 Farm-yard Manure 



with 3 cwt. of 

 Artificial Guano. 



10 tons do. 

 with 10 cwt. of 

 Rape-dust. 



10 cwt. of 

 Rape with 3 cwt. 

 of Guano. 



10 tons do. with 

 2 cwt. of Guano. 



10 tons do. 

 with 2 cwt. of 

 Artificial Guano. 



The practical farmer need not be deterred by the formidable 

 array of experiments above suggested. He may try any two or 

 three of them, and his results will be valuable in proportion to 

 the accuracy with which his land is measured and his manures and 

 crops weighed. I have taken 20 tons of farm-yard manure as a 

 standard, though in many highly farmed parts of the country no 

 more than 15 tons are usually applied. Twenty bushels of bones 

 are recommended by the Doncaster report, and I have lately 

 found that in the Lothians 1 cwt. of rape-dust is considered to 

 replace 1 ton of farm-yard manure. This proportion of course 

 will vary with the quality of the latter manure ; but, whatever quan- 

 tity of this latter we take as the standard of comparison, it is easy 

 to adjust the proportions of the other substances accordingly. I 

 have not recommended any trial to be made with more than 

 6 cwt. of guano, because, where farm-yard manure is valued only 

 at Qis. or 7s. per ton, 5 cwt. of the former would cost as much 

 as 20 tons of the latter. 



The above experiments are intended to be made with the 

 green crop and continued during an entire rotation any pair of 

 them, however, may be tried on single crops, whether of corn or 

 of turnips and potatoes. In this way it ought also to be tried 

 against nitrate of soda and against bones, upon seeds and upon 

 old grass-lands. The mode in which such experiments may be 

 made will readily suggest themselves to the intelligent farmer. 

 In all cases the results should be accurately recorded, and if pos- 

 sible published. 



I consider it of importance that an artificial mixture, similar to 

 that above suggested, of which the composition is known, and 

 which can anywhere and by any one easily be made, should be 



* By this I mean that the eflFect of these several manures, applied once 

 for all to the green crop at the commencement of the rotation, should be 

 traced on each successive crop through the entire course of cropping. 



