23 



hastened maturity to such an extent that when unfavorable 

 weather occurred in August the plants fertilized with phos- 

 phate had reached such a stage of fruiting that they were 

 unable to resist disease to the same extent as the less com- 

 pletely developed plants on other plots. 



That there is some correspondence in 1897 between yield, 

 late maturity and freedom from disease is suggested by the 

 data in the following table, which shows the yield in pounds 

 of seed cotton per acre, percentage of total crop gathered at 

 first picking, August 26, and percentage of plants seriously 

 injured by " rust" as estimated August 21 : 



Relation beticeen yield^ earliness, and amount oj '■^rust." 



o 

 o 



1 



2 

 3 

 4 



'{ 



8 

 9 



Fertilizek. 



c 



3 '. 



O ' 



s : 

 o 



Lhs 

 200 



240 



200 

 200 

 240 

 200 

 200 

 240 

 200 



200 

 240 

 200 



Kind. 



Cottonseed meal 



Acid pbospliate 



\o fertilizer 



Kainit 



Cottonseed meal 1 



Acid pliosphate ( 



Cottonseed meal ) 



K liiiit / 



Acid phosphate i 



Kainit. ... . . . . i 



No fertilizer 



Cottonseed meal | 



Acid phosphate > 



Kainit I 



ce 

 3 «)■ 



1^ 



*" es 

 « .2 



te C 



'*^ -r- 



® 3s 



be 03 



ei a 



O^ 



® — 

 p., 



20 

 90 

 80 

 10 



90 

 10 



15 



80 



75 



Apparently this red soil was not particularly deficient in 

 potash. For in 1897, in a part of the same field, with identical 

 previous treatment, kainit, alone and in every combination^ 

 failed to increase the yield of corn over that of the unfertilized 

 plots. 



Our results in the above table seem to confirm those of 



