38 STORRS AGRICULTURAL EXPERIMENT STATION. 
seasons the crops would suffer more for lack of moisture where 
relatively small amounts of humus were present in the soil. 
Explanation of tables—Two tables of data are given in con- 
nection with the discussion of the results for each crop. The 
first table in each case gives the weight and cost of fertilizers 
per acre, the weights of crop per section and the calculated 
yields per acre, and the increase of the yield from the sections 
with fertilizers over that from the sections without fertilizer. 
The yields per section are the weights of the green crop taken 
in the field when harvested, or the weight of the crop taken 
when partially dried. The cow peas (vines) were weighed as 
soon as possible after cutting. The total corn (grain) and the 
soy bean seed from each section were dried in the barn and 
weighed when thought to be in good condition for grinding 
into meal. The corn stover was cured in the field and then 
weighed, while the soy bean straw was discarded because the 
leaves practically all fall off before the seed has fully ripened. 
The costs of the fertilizers per acre given in the tables repre- 
sent only the market price of the various ingredients of the 
fertilizers used in the experiments. The cost of mixing the 
materials, of transportation, etc., is not included. The costs 
are calculated from the weights of the ingredients per acre and 
the values of the ingredients as adopted by the New England 
Experiment Stations. These values vary from year to year. 
The valuation of the different ingredients used in the experi- 
ments of 1900 were as follows: 
Per Pound. 
Nitrogen as nitrate of soda, - - - - - rie LAC Cts: 
Nitrogen as sulphate of ammonia, - - - - 164 “* 
Organic nitrogen (in dried blood), - - - pred LO ah 
Phosphoric acid (soluble), — - E : : PP aes 
Potash as muriate, - : . CARS gc pe tearaey » ye 
The second table in each case gives the total yields of the 
crop per acre, the percentages of water-free substances or of 
dry matter in the crop when weighed for the determination of 
the yields, the percentages of protein (N. X 6.25) in the dry 
matter and the estimated yields of dry matter and of protein 
per acre. . 
The amounts of dry matter per acre are calculated by multi- 
plying the total weight of crop as harvested by the percentage 
