Cover Crops 39 



flower, and it should first be rolled down by short 

 intervals abreast of the plough, so that the plough 

 is able to turn the crop under. 



As the clean system of summer cultivation that is 

 necessary to practise under irrigation burns up the 

 humus in the soil, it is advisable to plough in green 

 crops in established orchards at regular intervals. 



