CORN. U 



NEW HAMPSHIRE. 1888. 



By G. H. Whitcher, Director. Bulletin No. 6. The experiments 



cover a period of four years (1885-88). The results show that potash 



is the leading element of plant-food in this soil, phosphoric acid is 



also needed in small amounts, while there is little need of nitrogen. 



Where potash was omitted there was no increase of crop. 



"From what has been said it is evident that potash stands first, 



phosphoric acid second, and nitrogen last. In fact, we should use 



nitrogen but sparingly, and only when direct experimental work 



proves it to be beneficial. 



'These results, almost without exception, seem to warrant the 

 conclusion already expressed that potash and not phosphoric acid is 

 the controlling factor. 



"Experiments made in other parts of the State on soils differing 

 greatly from the Connecticut River land, show even more marked re- 

 sults." 



1889. 



Co-oPERATivE Experiments by G. H. Whitcher, Director. Bulletin 

 No. 10, March, 1890. The object in view in making these ex- 

 periments was to find out what composition of fertilizers would suit 

 best for the State at large. Another object was to compare the 

 effect of artificial fertilizers with the effect of stable manure, and 

 also to investigate if the composition of mixed fertilizers as they are 

 usually sold in the State is best suited to the crops. Ten dollars' 

 worth of fertilizerand fifteen dollars worth of manure were used per 

 acre. The experiment demonstrated that artificial fertilizers are 

 equal in effect, if not superior, to stable manure, and that commercial 

 fertilizers are deficient in potash. 



"The effect on husked corn from manure was 89.69 bushels, from 



the best three combinations of chemicals 90.62 bushels, from prepared 



fertilizers 63.58 bushels, from ashes 65.40 bushels, and from plots not 



fertilized 41.00 bushels. 



''Comparison of composition of fertilizer mixtures that produced 



best results with the average composition of eighteen commercial 



fertilizers sold in New Hampshire in 1890: 



Chemical? Producing Average of Fertilizer? 



Best Results. sold in N. H. in 1890. 



Phosphoric Acid 9. 25 per cent. 1 1.08 per cent. 



Potash 11-3 "■ 2 57' •* 



Nitrogen 3.5 *«' 3.4$ " 



