379 



than when no fertilizers or only mixed minerals were used, the increase 

 being- most noticeable with nitrate of soda and least so with dried ])lood. 

 In the straw no perceptible increase followed the application of iiitrof-- 

 enons fertilizers, unless possibly in the case of crude cellulose where 

 nitrate of soda was used. 



There was an increase in pounds of protein per acre in the plats supplied Avitli 

 nitrogenous fertilizers somewhat in proportion to the amounts applied. This increase 

 was greatest in the plats to which nitrate of soda was applied. These results are in 

 accord with observations made by the station upon the relation of the protein in 

 maize and in grass to the nitrogen applied in the fertilizer. 



The increase in the amount of nitrogen in the crop did not equal the increase in 

 amount of nitrogen applied in the fertilizers, implying that the plants were not able 

 to avail themselves of all the nitrogen supplied. 



Effects of different fertilizers upon the composition of 

 CORN, C. D. Woods, B. S., and H. B. Gibson, B. A. (pp. 107-111).— 

 These studies are in continuation of those reported in the Annual Report 

 of the station for 1889 (see Exj)eriment Station Eecord, vol. ii, p. 398), 

 and include analyses of the corn and stover raised on the differently 

 fertilized plats in two of the soil tests reported .above. Ko inferences 

 are drawn from the tabulated results. 



Proximate composition of corn and stover of New Eng-land- 

 GROWN maize, C. D. Woods, B. S., and H. B. Gibson, B. A. (pp. 

 112-119). — In connection with the studies at the station of the effects 

 of fertilizers on the composition of the corn crop, analyses have been 

 made during the past 3 years of 121 samples of kernels and 101 samples 

 of stover of yellow flint corn, and of 1 sample each of kernels and 

 stover of white flint corn. The maximum, minimum, and average per- 

 centages of food iugredients found by these analyses in the corn and 

 stover grown with diflerent fertilizers, are tabulated, and from these the 

 average composition of the corn and stover analyzed is calculated. It 

 was noticed that in general — 



The addition of nitrogen produced a com richer in protein than was obtained 

 from the use of mineral fertilizers alone. * * ** The variations in protein of 

 5, in fat of 3, and in nitrogen-free extract of 6 per cent show that the water-free 

 substance of corn kernels grown upon different soils, with different fertilizers, in 

 different seasons varies greatly in composition and in feeding value. * * * 



The variations in percentages of water at harvest and in the composition of the 

 water-free substance of stover are much more marked than those of corn. There 

 is an extreme variation of more than .50 per cent in the water at harvest and of 7 

 per cent in the protein. In some cases the percentage of protein in stover equals 

 that of average corn and exceeds that of some of the corn by nearly 2 per cent. 

 The great range indicates the great differences that may be expected in the feeding 

 vahies of stover from different fields or even from different parts of the same field 

 when fertilized differently. 



On sources of error in field sampling of crops for analy- 

 sis, 0. D. Woods, B. S. (pp. 120-135).— With a view to studying the 

 errors which may arise from sampling even when carefully done, "dupli- 

 cate samples were analyzed from each plat of a soil test with maize^ 



