458 Journal of Agricultural Research voi. xiii, no. 9 



It is evident from the negative soluble boron results that the boron is 

 combined in an insoluble form in the soil, although much of it is undoubt- 

 edly held in levels lower than the first 6 inches of soil The nitrate 

 results for the soil from the boron-treated plots are, with the exception 

 of the 40- ton borax-treated plot, a little lower than in the control plot. 

 The amount of ammonia in the boron-treated samples averages higher 

 than that in the control soil. 



EXPERIMENTS OV THE SECOND SEASON, 1915 



Soon after the samples had been taken from the plots on June 26, 

 1 91 5, the ground was again fertilized with manure treated as before — 

 that is, the same amounts of boron-treated and untreated manure were 

 added to their respective plots and it was plowed under and the ground 

 harrowed and rolled. On July 1 5 corn {Zea mays) , turnips {Brassica rapa) , 

 and pea beans {Phaseolus vulgaris) were planted. On August 10 it was 

 apparent that the beans grown on the plots to which boron-treated 

 manure had been added had been severely injured. The turnips on the 

 16-ton boron-treated plots were normal, but were thinner on the 24- and 

 40-ton boron-treated plots than on the corresponding controls. The 

 growth of corn was irregular on all the plots, but no yellowing from the 

 boron was apparent. The beans showed a yellowing on all the plots. 

 The turnips that came up on the 24- and 40-ton plots showed no yellowing. 

 The growth of all the vegetables was poor on all the 40-ton plots, and a 

 marked reduction in the crop yield was evident on the 24-ton plots, 

 especially where boron had been added to the soil. On September 7 

 the plants on the 1 6-ton plots were in a fairly good condition. The only 

 injury to any of the plants on these plots that may be attributed to the 

 boron was a yellowing of the bean plants. On the 24-ton plots none 

 of the crops were doing well, although the control was undoubtedly the 

 best of the three plots. The beans were injured and the growth of the 

 turnips was irregular, especially on the borax-treated plot. The corn 

 showed a reduced stand as one effect of the added boron. The 40-ton 

 boron treatments had injured all the crops, the beans severely, the 

 turnips and corn considerably. The crops on the 40-ton control plot 

 were poor and showed some injury. 



One row (the middle row) of corn and of beans were pulled from each 

 plot and weighed by Mr. Rhodes, of the Arlington farm, in October, 191 5. 

 These weights, given in Table VIII, represent the whole plants, including 

 the roots. 



The weights of beans and com given in Table VIII indicate a greater 

 influence of the 24-ton boron-treated manure plot than was evident from 

 the observations reported above. While the amount of boron in 

 the manure did not produce any outward evidence of injury on corn, it 

 seriously affected the yield. It is also evident that the untreated manure 



