294 



CITRUS FRUITS AND THEIR CULTURE. 



continue cultivation after 

 sowing the seed, it may be 

 done for a time, but this will 

 have to be confined to the 

 tree rows eventually, culti- 

 vating one way only, and al- 

 lowing the beggarweed free 

 possession of the middles. 

 After having become well 

 established, so as to produce 

 plenty of seed, cultivation 

 may be carried on over the 

 whole surface from early 

 spring to about the middle of 

 June, after which the plants 

 will spring up and cover the 

 ground. 



This cover crop can easily 



B 



;1 



Fig 1 . 69. A, nodules on Beggarweed roots natural size. 



R. root system of Beggarweed, with an abundance of 



nitrogen nodules. 



