142 EXPERIMENTS WITH CHLORIDE OF POTASSIUM. 



that careful experiments should be made. I would suggest, 

 therefore 



1. Experiments with chloride of potassium, applied at the 

 rate of 2 cwt. per imperial acre upon corn crops, upon grasses 

 and clovers, and upon crops of turnips, beet, potatoes, and 

 cabbage. To the corn and grass crops it should be applied as 

 a top-dressing in spring for the roots it may either be covered 

 in along with the manure in the rows, or it may be strewed 

 with the hand around the plants after they have come up and 

 have been thinned, as in this country is usually done with 

 turnips, carrots, beet, and mangel-wurtzel. 



2. With the same chloride applied to the same crop, at the 

 rate of 1 cwt., 1 J cwt., 2 cwt., and in the case of mangel-wurtzel 

 and beet, turnips and cabbage, of 3 cwt. per acre. 



3. With the same quantity of 1 J or 2 cwt., applied at differ- 

 ent seasons, and in different ways, to the same crop. 



4. The same experiments may be tried upon crops of differ- 

 ent kinds. At one season, or month, or period of growth, it 

 may be more favourable to one kind of plant than to another 

 to one more useful when applied all at once, to another in suc- 

 cessive portions at successive periods, and so on. 



5. Its effect, compared with equivalent weights of sulphate of 

 potash, and of carbonate of potash, (pearl ash,) on the same plant. 



6. The same tried on different kinds of plants. 



If it is only the potash that acts in the case of all these com- 

 pounds, then all ought to produce nearly equal, or at least very 

 analogous effects. If the acid or the chlorine in any case 

 modify the action, this influence ought to appear in the result. 

 It may also appear that such special influence, if it exist, is dif- 

 ferent in the case of one plant from what it is in that of another. 



7. On different kinds of soils. 



It is worthy of attention, whether the physical character or 

 the chemical composition of the soil, and especially the propor- 

 tion of lime it contains, does or does not affect the kind of 

 influence this chloride is found to exercise. 



8. It will be physiologically interesting also to investigate 

 by experiment the special action of the chloride of potassium 

 upon marine plants. Will salt-loving plants thrive under the 



