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from a light, sand}^ loam down to a heavy, limestone clay- 

 loam. 



QUESTION. Has the soil made any difference in the 

 result? Wouldn't that have to be taken into consideration? 



DR. STEWART. The soil, and especially the previous 

 treatment of the soil, I believe does make considerable dif- 

 ference, but it is rather surprising to me that in many 

 instances the soil influence is much less than I might have 

 expected it would be. I am almost coming to the opinion 

 that the age of the tree and the amount of fruit it has 

 borne. — the business that that tree has done, and the 

 previous treatment of the soil are likely to cut a much 

 greater figure in the chances of benefit from the application 

 of plant food, than does the original type. Peculiarly 

 enough, one of our lightest soils is not responding much to 

 fertilization, and, on the other hand, one of our heaviest 

 soils is. which is again quite contrary to the customary 

 opinion. 



DR. BROOKS. I wanted to ask a question in regard to 

 the different colors; are the results based upon one soil? 



DR. STEWARRT. No. These two here (indicating) 

 are based upon two totally different soils in different parts 

 if the state, and in addition to that, we have similar com- 

 parisons from four other soil types that I simply referred to. 



PROF. BROOKS. I noticed that the plots which 

 ranked highest in the cover crop experiment were near one 

 side of the field, that is. numbered consecutively. Do you 

 suppose that shows that there is a natural superiority in the 

 soil on that side of the field? 



DR. STEWART. We have a fertilizer experiment 

 right next to that one and it gives us a check on the soil 

 conditions throughout,and, with the exception that the buck- 

 wheat plat is a little more favorably situated with regard to 

 moisture — and perhaps the same is true of one end of the 

 alfalfa plat — ^I wouldn't say that there is any appreciable 

 advantage in one end or side over the other. 



PROF. BROOKS. I asked because I noticed the buck- 

 wheat ranked high, and I was surprised that it outranked 

 the soy bean. 



DR. STEWART. It certainly was a surprise to all of 

 us and is probably due, partly at least, to the rather slight 



