FERTILIZERS. 



25 



"The resulting mixture, when in fairly dry condition, wonld weigh approximately 

 5,000 lbs., shrinking about 18 to 20 per cent. It would have approximately the fol- 

 hjwing composition: 



Per cent. 



Moisture 1 18.00 



Available phosphoric acid 8.50 



Insoluble phosphoric acid 2. 00 



Total phosporic acid 10. 50 



Total nitrogen 0. 90 



"Two thousand pounds of sulphuric acid will not take up more than 600 lbs. of 

 leather and render the leather 70 per cent digestible." 



Cooperative fertilizer experiments in Norway in 1892, F. H. 



Werenskiold {N'orsJc Landmandshlad, 13 {lS9i), pp, 97-99). — The 

 experiments were conducted uuder tlie auspices of the SmAleneue 

 County Agricultural Society, and the analytical work was done by the 

 Chemical Control Station at Christiauia. Seven farmers rei)orted results 

 during 1892. Barley was in all cases grown on 3 experimental plats. 

 Of these, plats 1 and 2 received Thomas slag j)hosphate and superphos- 

 l)hate, respectively, while plat 3 received no phosphoric acid. The 

 quantities of fertilizers applied and size of plats are not given in the 

 report. The average composition of the ash of the grain and straw 

 produced was as follows : 



Composition of asli. of grain and straw from differently treated plats. 



Plat 1, Tliomas slag 



Plat 2, supex'pliospliate. 

 I'lat H, uo phosphale ... 



Grain. 



Nitrogen. 



Per cent. 

 1.72 

 1.69 

 1.80 



Pbos- 



phoric 



acid. 



Percent. 

 0.98 

 0.92 

 0.92 



Potash. 



Percent. 

 0.63 

 0.60 

 0.58 



Straw . 



Nitrogen 



Per cent. 

 0.45 

 0.48 

 0.60 



Phos- 



plioric 



acid. 



Per cent. 

 0.22 

 0.22 

 0.23 



Potash. 



Percent. 

 1.59 

 1.51 

 1.47 



The following average yield of grain and straw were obtained: 

 Average yields of grain and straw. 



The average increase in yield per ar (= one fourth acre) with fertili- 

 zers on plats 1 and 2 over plat 3 was 61.8 kg. of grain and 89.7 of straw 

 with Thomas slag phosphate, and 49.8 kg. of grain and 73.2 of straw 

 with superjihosphate. — F. w. woll. 



Commercial fertilizers, P. Collier and L. L. Van Slyke 

 {Neio York State Sta. Rpt. 1892, pp. 209-221, 4.95-5^9).— Remarks on 

 the conduct of the fertilizer control, the text of the State fertihzer law, 

 a schedule of trade values for 1892 and 1893 and notes on valuation, 

 statistics of the fertilizer trade in New York, and tabulated analyses 

 of 247 brands of fertilizers examined during the year. 



