258 Fertilizers 



grow them year after year upon the same soil, and under 

 such conditions it is necessary to give special attention 

 to the fertilization. Because both crops are legumes, little 

 nitrogen is needed except during the early stages of 

 growth to start the plants well. For peas the nitrogen 

 should be derived largely from available sources, 75 

 pounds of nitrate of soda, 400 of acid phosphate and 100 

 of muriate of potash should supply the needed plant-food. 

 The beans which follow should thrive upon the residual 

 fertility elements, but it is often well to make an additional 

 application of 400 or 500 pounds of a mixture high in the 

 mineral elements and deriving its nitrogen almost entirely 

 from organic sources to prolong the period of growth. 

 It should be remembered that these crops thrive best upon 

 soils rich in organic matter, and it is a good plan to return 

 the vines to the soil. 



FIELD BEANS 



Field beans, often called white beans, are grown ex- 

 tensively for the food-stuffs market. This crop should 

 be given different treatment than the garden bean because 

 it is grown for the mature seed and the growing period is 

 much longer. When grown in a rotation of beans, wheat 

 and clover, little nitrogen need be used. When corn is 

 included in the rotation, more nitrogen should be applied. 

 In general, no less than 400 pounds of a mixture com- 

 posed of 



Nitrate of soda 200 Ibs. 



Dried blood 100 Ibs. 



Acid phosphate 1300 Ibs. 



Muriate of potash ..- '*.' 400 Ibs. 



should be used to the acre. 



