235 



MR. RICHARDS : You speak of manure in terms of 

 tons ; we farmers and fruit growers are used to saying cords. 



PROFESSOR LIPMAN : Well, double that. 



MR. RICHARDS: At ^larshfield Hills it costs six dollars 

 gnd fifty cents a ton delivered ; you cannot buy it even in 

 i\Tarshfield for less than that. 



]\IR. AA^ALKER : I have read that turnips in growing 

 njake use of a greater amount of potash in the soil than most 

 other crops, and that therefore when they are grown as a 

 cover crop and turned in. they tend to increase the available 

 potash in the soil more than other cover crops. Is there 

 i'.nything in that? 



PROFESSOR LIPMAX: That statement has been made 

 with reference to the ability of turnips to utilize insoluble 

 rather than soluble potash, and turnips, as the analysis 

 show, do not contain as much potash as some of the legumes. 

 I' or instance, the clovers contain a larger proportion of 

 potash and I should regard clover and vetch as a more sat- 

 ir^factory crop through which soil potash might be saved 

 up and used to be transformed later into fertilizer for other 

 crops — potash as well as nitrogen fertilizers. I do not see 

 ihat turnips would have any advantage as a cover crop over 

 legumes that can be grown under the same conditions, be- 

 cause the legumes will not only add potash matter to the 

 soil, but will also add nitrogen to the soil. 



MR. HALE : Does ground limestone produce satisfac- 

 tory results in the soil, and what is the maximum price at 

 Ti'hich you would consider it an economical fertilizer? 



PROFESSOR LIPMAX: Ground limestone produces 

 good results if used in sufficient quantities. Our observa- 

 tions and experience indicate that for practical purposes one 

 ton of freshly burned lime is equivalent to two tons of 

 ground limestone, and you can decide then which is the 

 cheapest source of lime for your purpose, using that method 

 of comparison. For instance, if you can obtain a freshly 

 burned lime, run of the kiln lime in bulk, in carload lots, at. 



