188 AGKIOULTrEAL ExPEEIMENT STATION, ItHACA, N. Y. 



why the average of these experiments will not represent the production 

 and value for the whole year. It is, therefore, evident that barn 

 manures when produced from fairly nitrogenous food liberally fed, con- 

 tain a much larger proportion of nitrogen than either phosphoric acid 

 or potash, and that where commercial fertilizers are used with such 

 manures, the most economical application will be secured by applying 

 a much larger proportion of phosphoric acid and potash in the commer- 

 cial manures than is usually sold in complete fertilizers throughout the 

 State. , 



As the value of the manure depends so much on the character of the 

 food consumed it will be of interest to notice the difference in the fer- 

 tilizer value of the foods fed in these experiments and also two other 

 common foods. The following tables give such values: 



Fertilizer Value of Foods. 



Corn meal 



Corn ensilage* . . 



Clover hay 



Cotton-seed meal 

 Linseed meal. . . , 



Meat scrap , 



Oats 



Skim-milk 



Timothy hay* . . 

 Wheat bran .... 

 Wheat straw . . , 



Value of 



nitrogen in 



one ton. 



$4,530 



0.780 



5.700 



20.850 



16.080 



29.010 



5.355 



1.740 



3.000 



7.560 



0.810 



Value of 



phosphoric 



acid in 



one ton. 



$0,828 

 0.144 

 0.540 

 3.660 

 2.280 

 6.012 

 0.900 

 0.260 

 0.432 

 3.400 

 0.300 



Value of 

 potash in 

 one ton. 



|0.306 

 0.315 

 1.314 

 1.650 

 0.990 

 0.666 

 0.450 

 1.080 

 1.170 

 1.341 

 1.017 



Total value 

 per ton. 



$5,664 

 1.240 

 7.554 

 26.160 

 19.360 

 35.688 



6, 



2, 



,700 

 ,108 



4.600 

 12.301 



2.127 



It will be readily seen from the foregoing table that there is even 

 more difference in the fertilizer value of foods per ton than there is in 

 the value of the excrement from the different kinds of domestic animals 

 usually kept on the farm. 



Of all foods fed in this series of experiments the meat scrap contained 

 by far the largest amount of plant food, and its value was also the 

 greatest. The great fertilizer value asi-igned to this food was due to 

 the large per cent of nitrogen which it contained; although rich in 

 phosphoric acid for an animal food the value of this constituent is small 



* Values calculated from analyses given in fifth and seventh annual reports of New Jersey 

 Experiment Station. 



