WHEAT GIJOWX IN IJOTATloN .;:, 



fallow yielded 1757 11). against lOiT lit. on the coniiiuKuis 

 wheat plot, or a gain of 130 ll)s. only dne to t'allowinL;. 



It will be seen that the bare ftillow increased the wheat crop 

 coming after it by nearly 52 per cent, when a comparatively di y 

 autumn succeeded the fallow, but the increase was less than s 

 per cent, when there was much rain and percolation after the 

 summer fallow. 



It is interesting to compare these two plots, both without 

 manure, with the continuously unmanured plot in the Agdell 

 field, which comes into wheat once every fom* years in the 

 course of the rotation (see p. 100). The plot in question has 

 received no manure since 1852 ; it is cropped on a four-course 

 rotation, beginning with turnips which are completely removed 



Table XXVI. — Wlienf gwicn vnthouf Manure al liofliiniistnf. 

 (1) Grown continuously ; (2) In alternation v:ifh Fa / loir ; 

 (3) In Four-course rotation. Average for the 12 yearn 

 (1855, '59, '63, '07, '71, '75, '79, '83, '87, '91, '95, and 1899). 



from the land, after the turnips barley is taken, then comes a 

 season of bare fallow before the wheat. It will thu.s be seen 

 that three crops are removed in the course of the four year.'^, 

 but so very small is the turnip crop that practically the land i.s 

 cropped only every other year. For the twelve years during 

 which comparison is possible the average crop of wheat grown 

 thus in roUition on continuously unmanured land lia.s been 2s»; 

 bushels per acre, as against IS'l bushels for wheat afbr fallow 

 and 12"4 liushels for continuous wheat. 



It is diilicult to explain this superiority of the wheat grown 

 in rotation over the wheat atler fallow. There are lui ihoil' 

 residues in the land in the one case than in the other, the land 



