The Effect of Borax in Fertilizers. 109 



used, but the results were not entirely uniform in this respect. 

 As might be expected the most severe injury occurred with 

 fertilizer 5513 where the amount of anhydrous borax applied 

 was equivalent to 38.6 pounds per acre. The 4 plants in this 

 series were much stunted and yellowed, although those having 

 the fertilizer applied above the seed-piece finally made a partial 

 recovery and attained a height of 7 and 12 inches respectively in 

 3 months time. The early condition of the last mentioned or 

 larger plant is shown in Fig. 20, pot 32. At that time it was 

 weak and yellowed. The plant in pot 44 was grown on fertil- 

 izer No. 5409 which contained no borax. The two plants ger- 

 minated within two days of each other and were about two 

 weeks above ground when the photograph was made. The two 

 plants where fertilizer 5513 was placed below the seed-piece 

 made very little growth. At the end of 3 months one consisted of 

 simply a rosette of small leaves just at the surface of the soil. 

 See Fig. 21. The other was only" 3 inches high. 



The amount of injury obtained with fertilizer No. 5389 

 where the application of anhydrous borax was equivalent to 7 

 pounds per acre was somewhat surprising. Not only was there 

 some stunting and yellowing of the plants where the fertilizer 

 was applied below the seed-piece, but a considerable amount of 

 the type of injury next to be described was present on all of 

 them. 



THE MOST COMMON TYPE OF INJURY TO POTATOES IN THE 

 GREENHOUSE. 



While some oi the plants in the greenhouse, more particu- 

 larly in the case of heavy applications of borax, showed the 

 yellowing and a stunted, shrubby appearance similar to that 

 characteristic of plants in the field where borax was present 

 in the fertilizer used, this was not general. Yellowing was more 

 or less in evidence in a number of cases when the plants were 

 young but this usually disappeared as they became older. Quite 

 a different type of injury occurred, without exception but in 

 varying degree, upon all plants which were grown in pots con- 

 taining a fertilizer which carried borax. 



This type of injury was characterized by death and drying 

 out of the tips and margins of the leaflets. The injury first 



