96 Report of the Acting Director and Chemist of the 



(6) Dissolved bone, contaming 15 per cent, of available pbos- 

 pboric acid and 3 per cent, of nitrogen. 



(7) Dissolved bone-black, containing 15 per cent, of available 

 phosphoric acid. 



(8) Dissolved rock, containing 12 per cent, of available phos- 

 phoric acid. 



(9) Muriate of potash, 80 per cent, pure, containing 50 per cent, 

 of potash. 



(10) Sulphate of potash, 90 to 95 per cent, pure, containing 50 

 per cent, of potash. 



(11) Kainit, containing 12 to 13 per cent, of potash. 



(12) Wood-ashes, containing 5 per cent, of potash. 



Alfalfa. 



Nitrogen 



Available phos- 

 pLoric acid. .. 



Potash 



Per cent. 



10 



Pounds for 

 one acre. 



5 to 10 



30 to 60 



40 to 80 



Pounds of different materials for one acre. 



30 to 60 lbs. nitrate of soda; or 



25 to 50 lbs. sulphate of ammonia ; or 



50 to 100 lbs dried blood ; or 



1,000 to 2,000 lbs. stable manure. 



300 to 600 lbs. bone-meal ; or 



200 to 400 lbs. dissolved bone-meal or 



bone-black ; or 

 250 to 500 lbs. dissolved rock. 

 80 to 160 lbs. muriate ; or 

 80 to 160 lbs. sulphate ; or 

 325 to 650 lbs. kaiuit ; or 

 800 to 1,600 lbs. wood-ashes. 



Suggestions. — Like clover, alfalfa needs only small applications 

 of nitrogen, because it can obtain nitrogen from the air. A liberal 

 supply of phosphoric acid and potash compounds needs to be ap- 

 plied from time to time, the application being made preferably in 

 the fall or early winter. Lime needs to be present in the soil in 

 liberal proportions. When deficient, it can be applied in the form, 

 of ground limestone, chalk or marl at the rate of one to three tons 

 an acre, and preferably two or three years before sowing crop. 



