100 



EFFECT OF KAINIT ON RUST. 



In Bulletin No. 89 were published the results of a fertili- 

 zer experiment made in 1897 on the station farm, in which 

 kainit exerted a decided effect in reducing the injury due to 

 ''rust," or "blight." Earlj in the summer every one co-nduct- 

 ing a fertilizer test for this station was. requested to keep 

 a record of the amount of rust or other leaf disease on the 

 plots differently fertilized. 



The records bearing on this subject are summarized here: 

 Number of experiments in which kainit wa« decidedly 



effective in checking leaf disease S 



Number of experiments where rust was present, and 



where kainit did not check it 5 



Number of experiments where the ruist-restraining effects 



of kainit were slight 'S. 



Number of experimenters reporting no difference between 



different plots, but failing to note the presence or ab- 

 sence of leaf diseases 3 



Number of experiments entirely free from ruist 9 



The other reports co-ntained no data relative to this ques- 

 tion. 

 1/ At Lumber Mills, after the rainy weather beginning Au- 

 gust 14, "all plots that had no kainit began to throw oft' 

 leaves. The leaves would have dark s'pots come on them, 

 and then they would rot and drop off. Plot 5 shed worse 

 than the others. Plot 4 did not shed any." 



At Cusseta there was some ruist o'n plot 5 (pottonseed 

 meal and acid phosphate), but none on plot 9 (complete fer- 

 tilizer). No notes were recorded relative to the presence 

 or absence of rust on the other plots. The experimenter 

 writes: "Kainit helps to keep off rust." 



'Mr. J. M. King, who conducted a test at Wilson, Escam- 

 bia countj'^, but whose numerical results were not sent in, 

 writes as follows: 



"During July plots 1 ahd 5 were the best, but as the 



