120 



To the lower, or even -numbered portions, nothing was 

 applied, but to each of the others, half a pint of gypsum at 

 different dates, with the following results in hay, compared with 

 the immediately adjoining plot. The whole was cut on the 

 18th of July : 



No. 2 gave 18j Ib. No. 1, dressed March 18, gave 19 lb., or f Ib. increase. 

 4 ... 221... Q t ... April 3, ... 25^ ... 3 



6 ... 211... 5, 16, ... 231 ... 21 



8 ... 21f ... 7, ... May 2, ... 22j ... f 

 10 ... 21^... 9, 18, ... 28 ... 61 



The plots here were too small ; but the point deserving of 

 remark, and for which chiefly I have inserted the experiment, 

 is the large increase on the portion top-dressed after the middle 

 of May. This certainly deserves further experimental inves- 

 tigation. 



3. On wheat, after gypsumed clover an experiment is quoted 

 in British Husbandry ', i. p. 324, in which the dressed and un- 

 dressed portions of the same field gave respectively, per im- 

 perial acre 



Gypsumed, . . . 38 bushels. 



Undressed, . . . . 20 ... 



being an increase of 18 bushels ; but it is not usually recom- 

 mended, in this country, as a direct application to corn crops. 

 In the United States, at the rate of one or two bushels an acre, 

 it is a very common application to wheat. In consequence of 

 the more luxuriant growth, however, plastered wheat is said to 

 be more subject to rust. 



4. On mixed tare and lean crops, cut green, compared with 

 sulphate of soda, it gave the following results per imperial 

 acre : 



a Mr Fullarton, Forfarshire 



Nothing ..... produced 88 cwt. 

 Sulphate of soda, 3 cwt., . . ... 91 ... 



Gypsum, If cwt, ... ... 101 ... 



b Mr McClelland, Wigtonshire 



Nothing produced 96 cwt. 



Sulphate of soda, 3 cwt., . . ... 107 ... 



Gypsum, 6 cwt., . . 120.. 





