So 



CANAVALIA ENSIFORMIS (jACK BEAN) 



From these figures the amount of matter withdrawn from 

 the soil by the ripe pods may be calculated, and we see the 

 necessity of using the empty husks to obtain farmyard 

 manure. 



One hundred kilos of full pods contain : — 



Silica 



Chlorine... 



Sulphuric acid 



Phosphoric acid ... 



Lime 



Magnesia 



Potash 



Soda 



Oxide of iron 



Carbonic acid, &c. 



Total mineral matter 



Nitrogen 



Dry matter 



In the seeds 



0-039 

 0-032 

 o'077 



0-454 

 0"i36 

 0-158 

 0-794 

 0-088 

 0-008 

 0-192 



1-978 

 2-276 



49775 



Numerous as the other advantages of the Jack Bean are, 

 its value as a green manure outweighs them all, and it is 

 thus important to know the composition of the vegetable 

 mass which may be returned to the soil after a few months' 

 growth. 



When planted between the rows in December or January, 

 the Jack Bean is in full growth and flowers three months 

 later; this is the time for ploughing in. The leaves are large 

 and give good protection to the soil, but the amount of 

 foliage, though comparatively large, is hardly in proportion 

 with the general appearance of the plant, which is remark- 

 able. When planted later its growth is more vigorous, the 

 stems are less long and slender, being perhaps more stocky, 

 and its growth is less rapid. However, provided it escapes 

 too long a period of drought, this plant may be sown 

 throughout the year. 



In favourable circumstances, when planted along every 

 second inter-row, the plant mass produced may easily be 

 as much as 9,500 to 11, 850 kilos per hectare. Evidently, when 

 every row is sown the yield will be doubled, but in this 



