268 



EFFECT OF VARIOUS MANURES, ETC. 



III. Lettuces. 



The following are the results of experiments with manures, 

 applied to a plantation of White Paris Cos Lettuces, May 31st, 

 1844, at the rate of about 4 cwt. per acre. The Lettuces were 

 cut over by the ground and weighed on the 9th of July, they 

 being then in perfection. 



Manured with — 

 Peruvian guano . . 

 Sulphate of ammonia 

 Superphosphate of lime . 

 Nitrate of soda . • 

 Humphrey's farmers' compound 

 Muriate of ammonia . . 

 Potter's guano . 

 Nothing .... 

 Sulphate of magnesia 



It appears that in dry seasons, like that of 1844, these kinds 

 of manures have little effect. The above were well watered 

 after they were applied ; but still tliey did not act so well, in 

 comparison with the unmanured, as they were observed to do in 

 the preceding wet season. It will probably be found better to 

 mix them thoroughly with some bulk of soil, and then dig in the 

 compost in the usual way. 



IV. Potatoes. 



The Potatoes, Bread-fruit variety, were cut into sets, and 

 planted May 3rd, in rows 2^ feet asunder, about 7 inches apart 

 in the rows, and 6 inches deep. After being mixed with about 

 7 parts of fine soil, the Guano manures were scattered along the 

 bottoms of the trenches, and then watered from the rose of a 

 watering-pot. 



The crop was taken up, and weighed October 21st. Many of 



