299 



fertility of the soil by plowing in vegetable matter and espe- 

 -cially animal manures will do much to prevent rust. The ap- 

 plication of kainit is often very beneficial. 



3. Low wet lands and seepy hillsides are also subject to 

 rust. In these cases better drainage, together with proper 

 fertilizer, will give relief. 



4. Sporadic cases of rust may be expected on almost any 

 kind of soil in very unfavorable seasons. 



The following experiments conducted in 1898 serve to 

 still further corroborate these conclusions, and they also 

 bring out a few other points of interest : 



Experiments on the Station Farm. 



Prof. Duggar kindly consented to plant some potash fer- 

 tilizer tests with cotton on land known to be subject to rust. 

 The place selected was on top of a dry, gravelly knoll. On 

 September 4 these plots were carefully examined, and the fol- 

 lowing results noted : Plot 1. Some short point rows and an 

 outside row unfertilized as a check ; leaves practically all off. 

 Plat 2. Four rows fertilized at rate of 50 pounds muriate of 

 potash, 120 lbs cotton seed meal and 240 pounds acid phos- 

 phate; very good condition, an occasional rusted plant, but 

 fully 90 per cent, of foliage green. Plot 3. Four rows ; 1,000 

 pounds potash feldspar, 120 pounds cotton seed meal and 240 

 pounds acid phosphate ; leaves practically all off; the feldspar 

 seems to be entirely inert. Plot 4. Four rows ; 120 pounds 

 cotton seed meal, 240 pounds acid phosphate, no potash ; 

 leaves practically all off, perhaps 2 per cent, still green. Plot 

 5. Four rows ; t^O pounds kainit, 120 pounds cotton seed 

 meal, 240 pounds acid phosphate; about 10 per cent, still 

 green, balance all oft\ Plot 6. Four rows ; 1 00 pounds kainit ; 

 120 pounds cotton seed meal, 240 pounds acid phosphate ; 

 about 50 per cent, of plants green, balance with leaves cff. 

 Plot 7. 200 pounds kainit, 120 pounds cotton seed meal, 240 

 pounds acid phosphate ; about 70 per cent, of plants green. 

 Plot 8. Check; about 2 per cent, green. 



This experiment is interesting in showing the raaiked 

 effect of potash fertilizers in holding the foliage and prevent- 



