FERTILIZEKR. 



211 



The fertilizers applied and the results obtained were as shown m the 

 following table: 



Fertiliser exjxrimeitts icith hurU ij mi inarnh noiJu. 



Experiments with i)ho8plioric acid 



No. of Pliospboric acid (PjOs) applied 

 trials. per tiectare. 



In zinc boxes, 0.3 siiuarc iinter 

 surface : ' 



None 



150 leg. in form of Thomas slag 

 200 kg. in form of Thomas slag 

 75 kg. in fonii of superplios- 



pliate 



100 kg. in form of su])erphos- 



phate 



In cement-lined boxes, 1 square 

 meter surface : ^ 

 200 kg. in form of Thomas slag 

 100 kg. in form of superphos 

 phate 



Experiments with potash. 



Potash (KjO) applied per 

 hectare. 



In zinc boxes, 0.3 square 

 meter surface : ■'' 



Nouo 



200 kg. in form of sul- 

 phate 



300 kg. in form of sul 

 phate 



20J kg. in form of muri- 

 ate 



300 kg. in form of muri- 

 ate. . 



Protein 



in dry 



nuitler of 



grain. 



Per cent. 

 18.12 



18.62 



17.34 



15.31 



15."93- 



) 200 kg pota.sh (sulphate) and 2.'5 kg. N. (nitrate of soda) per hectare addeil in all cases. 

 o,«„n__ __.._^i. , „i_t,-i._, — .10=1... -K- '---tjate of soda) per hectare added in all ca""" 



! of soda! per hectare added in all cases. 



, ^„ , , , ..^. , raieoi socia) per iieciare aaoeii jii an cases. 



2 100 kg. potash (sulphate) and 25 k-g. X. (nitrate of soda) per hectare added Jn all cases. 

 3200 kg. Thomas slag and 25 kg. N. (nitrate o 



The application of soluble phosphoric acid caused a depression of 

 from 1 to 2 per cent in the protein content of the barley, compared 

 with Thomas slag; the muriate of potash produced 2 to 3 per cent less 

 protein in the grain crop than did the sulphate. A liberal supply of 

 potash favors a high production of starch in plants, but as far as is 

 known the muriate has not previously been shown superior to sulphate 

 in this respect. The opposite is true in case of potatoes. 



Experiments with fish guano. — One hundred parts of nitrogen in the 

 form of tisli (herring) guano had been found equivalent to 80 parts of 

 nitric nitrogen in earlier laboratory culture experiments. A number of 

 experiments were made in order to study the effect of a high fat con- 

 tent in the guano on the availability of the fertilizer. Common fish 

 guano containing 13.3 per cent of fat, and guano freed from fat by 

 extraction with ether, were compared, the oats experimented with being 

 sown in glass cylinders of 491 sq. cm. surface area. The basal fertili- 

 zation was 100 kg. potash (sulphate) and 200 kg. phosphoric acid 

 (Thomas slag) per hectare, equivalent to 89.1 lbs. and 178.2 lbs. per 

 acre, potash and phosphoric acid, respectively. The results were as 

 follows : 



Average results with ordinary and with fat-free fish (juano on oats. 



Nitrogen applied per hectare. 



None 



30 to 60 kg. in form of common rtsh guano 

 30 to 60 kg. in form of fat-free fish guano . 



Yield of 

 straw. 



Grams. 

 24.8 

 35.1 

 37.3 



Yield of 

 grain. 



Grams. 

 16.0 

 22.8 

 25 2 



Increase 

 in yield. 



17.1 

 21.7 



-F. W. WOLL. 



