ROTATION OF CROPS 217 



May, but in the south swedes and common 

 turnips are not put into the land for a month 

 or six weeks after the time at which they are 

 sowed in the north of England and through- 

 out Scotland. This fact explains, to some 

 extent, the greater ease with which catch 

 cropping may be practised in the south as 

 compared with the north, though the harder 

 winters of the north are the main restricting 

 cause. There is not much chance of getting 

 a catch crop in between the mangolds, 

 swedes, or turnips, and the barley or other 

 cereal that follows ; nor is there the oppor- 

 tunity of catch cropping immediately after 

 barley, because that crop is usually sowed 

 down with " seeds." In a season of drought, 

 however, when the " seeds " fail, the barley 

 stubble may be broken up, as in the case 

 of the wheat stubble, and similar crops may 

 be made to follow. As regards the " seeds," 

 a catch crop may or may not follow, accord- 

 ing to circumstances. If the clover stubble 

 is broken up by the end of June it is possible 

 to cultivate at least one crop of mustard 

 before the time for sowing wheat, which is 

 the crop that generally succeeds " seeds." In 

 place of treating the clover stubble in this 

 way, it may be ploughed and, as it is called, 

 '* bastard fallowed " that is to say, left 



