G7 



♦ plete fertilizer was by far the most efifective and most pro- 

 fitable application. In both of these years rust was pre- 

 valent but least severe on the plots receiving kainia. On the 

 other hand, in 1907, a year in which no rust troubled any 

 plot, a mixture of cotton seed meal and phosphate on plot 

 5 gave the gi-eatest increase, kainit being practically with- 

 out effect. 



In both years when rust prevailed, plot 10, receiving 200 

 pounds of kainit in its complete fertilizer, yielded more 

 than plot 10, where only half as much kainit was used in the 

 comjilete fertilizer. 



1906 1907 1908 



Lbs. Lbs. Lbs. 



Average yield of seed cottov per acre, unfertilized 328 716 460 

 Increase of seed cotton when cotton seed meal was added: 



To unfertilized plot 160 168 30 



To acid phosphate plot 108 218 32 



To kainit plot 35 — 53 —148 



To acid phosphate and kainit plot 201 282 436 



Average increase with cotton seed meal 126 70 7^ 



Increase of seed cotton per acre when acid phosphate was added : 



To unfertilized plot 112 192 30 



Tc cotton seed meal plot 60 578 92 



To kainit plot 21 45 —212 



To cotton seed meal and kainit p'ot 187 380 372 



Average increase with acid phosphate 95 299 71 



Increase of seed cotton per acre when kainit was added : 



To unfertilized plot 90 49 296 



To cotton seed meal plot —35 164 178 



To acid phosphate plot — 1 — 98 54 



To cotton seed meal and acid phosphate plot 92 ■ — 34 458 



Average increase tvith kainit 37 20 247 



