186 APPENDIX. 



VI. Every care should be used to observe and record, with 

 fulness and accuracy, the character, exposure, present condition 

 and previous management of the soil. The climate and weather, 

 the development of the crop in all its parts, and in all stages 

 of its growth, and generally, all facts bearing on the experi 

 ment, should be taken into the account. 



SCHEME OF EXPERIMENTS. 



A. General Effects of Salt, as increase of product, improve 

 ment of quality of crop, prevention of disease, &c. 



Two plots of any soil in any crop, both may receive other 

 manures or not ; but their treatment should differ only in this 

 fact, that one is salted, the other not. Use the salt at the rate 

 of 350 Ibs. per acre, (see 26th observation). 



B. Effect on particular crops, or classes of crops, as potatoes 

 compared with carrots, grasses vs. root-crops, root-crops vs. 

 grains. 



Two plots for each crop as under A. 



C. Effects of different doses : 



Soil and crop alike, one plot unsalted, one with 75 Ibs, one 

 with 150 Ibs., one with 300 Ibs., one with 450 Ibs., or other 

 different quantities, less or more in number, as convenient. 



D. Effects on different soils : 



Soils different, tillage, manure, and crop the same. Dose 

 of salt the same. Of each soil a salted and an unsalted plot 

 should be observed. 



