FERTILIZERS 81 



this manure is made twice a year, so that each plant 

 receives in all 100 grammes of the mixture (3| oz.). 



" To us this quantity appears too little, also that it would 

 be to the interest of the planter to strengthen still more 

 the proportion of potash in the complete manure by 

 giving the whole of the nitrogen under an organic form, 

 as oil-cake, guanos, fish-manure, farmyard manure, 

 composts, &c. 



" We advise the trial of a manure testing 



Potash . . . .20 per cent. 

 Phosphoric acid . . 10 



" This manure can be very easily prepared by mixing, for 

 manuring a hectare planted with 1500 plants (equal to 

 600 plants per acre) : 400 kilos of sulphate of potash, 

 containing 50 per cent, of potash, and 600 kilos of mineral 

 superphosphate, or the same quantity of basic slag, which 

 would furnish at the same time lime and phosphoric acid, 



" To reduce the expense of transport, there would be 

 equally an advantage in giving the phosphoric acid in the 

 form of superphosphate containing 45 per cent, of phos- 

 phoric acid ; there would then be required 240 kilogrammes 

 per hectare. 



" (These quantities, reduced to English weights and 

 measures, would be as follows : 400 kilos of sulphate of 

 potash per hectare are equal to 880 Ibs., and this is equal 

 to 344 Ibs. per acre. Six hundred kilos of mineral super- 

 phosphate are equal to 1300 Ibs. per hectare, and this is 

 equal to 530 Ibs. per acre ; and 240 kilos of the stronger 

 superphosphate, generally known as Professor Wagner's 

 'double phosphate,' are equal to 528 Ibs. per hectare, 

 represented by 211-2 Ibs. per acre.) 



"The mixture can be easily made without there being 

 any fear of loss of fertilizing materials. It should be 

 employed in the proportion of 400 or 600 grammes per 

 plant, according as the preference may be given to the 

 double superphosphate or to the common kind. (Equal 

 to 14 oz., and to 1 Ib. 5 oz., respectively.) Care must 



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