Plant-Food and Use of Fertilizers. 



171 



PIEPLANT. — (Rhubarb.) 



Relative proportions available plant- 

 food. Pounds per acre, r 



Nitrogen 50 to 100 ] 



Phosphoric acid 75 to 150 



r 



Potash 100 to 200 .j 



I 



Pounds material for one acre. 

 300 to 600 nitrate of soda ; or 

 250 to 500 sulphate of ammonia ; 

 750 to 1,500 fish guano ; or 



10,000 to 20.000 stable manure. 

 600 to 1,200 acid phosphate ; or 

 180 to 360 double superphosphate : 

 750 to 1,500 ground bone. 

 200 to 400 muriate of potash : or 

 200 to 400 sulphate of potash ; or 

 800 to 1,600 kainite; or 



2,000 to 4,000 wood ashes. 



or 



or 



Well decomposed stable manure worlced into the soil gives excellent re- 

 sults. Parts of Oregon have considerable rain in the spring, so that if all the 

 nitrogen is applied early in the season as nitrate of soda, much of it may be lost. 



Plums. — Fertilizers same as for apricots. 



POTATOES. 



Relative proportions available plant- 

 food. Pounds per acre, r 



Nitrogen 30 to 60-^ 



Phosphoric acid 60 to 120 



Potash 75 to 150^ 



Pounds material for one acre. 

 180 to 360 nitrate of soda ; or 

 150 to 300 sulphate of ammonia : or 

 450 to 900 fish guano ; or 

 480 to 960 acid phosphate ; or 

 150 to 300 double superphosphate ; or 



600 to 1,200 ground bone. 

 150 to 300 muriate of potash ; or 

 150 to 800 sulphate of potash ; or 



600 to 1,200 kainite. 



For early potatoes quick-acting forms of plant-food should be used. 



For late potatoes the amounts of fertilizers used may be diminished some- 

 what. The nitrogen may be applied in a slow-acting organic form. 



Avoid the use of stable manure or wood ashes immediately before a crop 

 of potatoes is grown. They promote the growth of potato scab. Some advise 

 the use of sulphate rather than the muriate of potash. 



Prunes. — Fertilizers same as for apricots. 



Pumpkins. — Fertilizers same as for cucumbers. 



Quinces. — Fertilizers same as for apples. 



RADISHES. 



Relative proportions available plant- 

 food. Pounds per acre, f 



Nitrogen 20 to 40 -i 



Phosphoric acid 40 to 80- 



Potash 50 to 100. 



Pounds material for one acre. 



120 to 240 nitrate of soda ; or 



100 to 200 sulphate of ammonia ; or 



300 to 600 fish guano ; or 



4,000 to 8,000 stable manure. 



320 to 040 acid phosphate ; or 



100 to 200 double superphosphate : or 



400 to 800 ground bone. 



100 to 200 muriate of potash ; or 



100 to 200 sulphate of potash ; or 



400 to 800 kainite ; or 



1,000 to 2,000 wood ashes. 



