136 EFFECTS ON ACID SANDY SOILS. 



as injurious here, both on the new and old part, as those described 

 in experiment 10. No measurement of products made, owing to 

 my being from home when the corn was cut down for sowing wheat. 



1825. The injury from disease less on the wheat than on the 

 corn of the last year on the latest marling, and none perceptible 

 on the oldest application. This scourging rotation of three grain 

 crops in four years was particularly improper on marled land, and 

 the more so on account of its poverty. 



1826. "White clover had been sown thickly over forty-five acres, 

 including this part, on the wheat, in January, 1825. In the spring 

 of 1826, it formed a beautiful green though low cover on even the 



rrest of the marled land. Marked spots, which were so diseased 

 over-marling as not to produce a grain of corn or wheat, pro- 

 duced clover at least as good as other places not injured by that 

 cause. The square, which had been sown in the same manner, and 

 on which the plants came up well, had no clover remaining by 

 April, 1826, except on a few small spots, all of which together 

 would not have made three feet square. The piece not marled, 

 white with poverty grass, might be seen, and its outlines traced, at 

 some distance, by its strong contrast with the surrounding dark 

 weeds in winter, or the verdant turf of white clover the spring 

 before. 



1827. Still at rest. No grazing allowed on the white clover. 



1828. In corn the land broken in January, five inches deep. 

 October 14th, made the following measurements : 



In the square not marled (A), 105 by 104 feet (thirty-six square 

 yards more than a quarter of an acre), made one barrel of ears 



Bushels. Pecks. 



Or of grain to the acre . ... . 9 If 

 The same in 1821 81} 



Gain, 1 0* 



Old marling (in B) 105 by 104J feet 2J barrels, 22 

 The same in 1821 ...... 22 



Gain, 1} 



New marling, 105 by 104J feet, on the side that seemed to be tho 

 most diseased (D), 1| barrels or nearly 12 bushels to the acre. 



[1832. Again in corn. Since 1826, the mild four-shift rotation 

 had been regularly adhered to. Ploughed early in winter five 

 inches deep, and again with two-horse ploughs just before planting, 

 and after manuring the land above the dotted line D x. The ma- 

 nure was from the stable yard, the vegetable part of it composed 

 of straw, corn-stalks, corn-cobs, and leaves raked from wood-land, 

 had been heaped in a wet state a short time before, and was still 



