AND NITROGEN ON TIIK CiROWTH OF TURNIP8. 



93 



The manures applied to these plots were as follows : — Plot 1 

 was 50 per cent, eoprolites, thiely ground ; plot 2 was 30 per 

 cent. French mineral phosphates, also finely ground ; ]ilot 3 was 

 hone meal well ground, containing 50 per cent, of phosphates 

 and 4 per cent, of ammonia ; ])lot 4 was 30 per cent, soluljle 

 phosphate from eoprolites ; ]jlot 5 was dissolved hones containing 

 36 per cent, of ph(js]ihates, half soluhle half insoluljle, and 3 per 

 cent, of annnonia; i)lot 6, of course, got notliing hut the seed. 



Section II. was used for two ^mrposes, the hrst two plots l)eing 

 to test potash along with insoluhle and soluble mineral phos- 

 phates. The other four plots were devoted to testing an equal 

 quantity of nitrogen, from as many different sources, along with 

 an equal (piantity of insoluhle mineral phosphate, applied with 

 each. The subjoined table gives the weight of each ingredient, 

 as applied per acre, with total weight and cost : — 



Plot 1 was coprolite finely ground with sulphate of potash, 

 containing 50 per cent, sulphate; plot 2 was mineral super- 

 phosphate, witli sulphate of potash also ; plot 3 was coprolite 

 with sulphate of ammonia ; plot 4 was coprolite with nitrate of 

 soda ; plot 5 was coprolite with fish gmano, containing 9 per 

 cent, of ammonia and 13 per cent, of phosphates ; plot 6 was 

 azote guano (or horn-and-hoof powder), containing 16 per cent, 

 of ammonia, also witli co])rolites. 



Section III. got an application of at the rate of 20 tons of 

 dung to the acre, and also each plot received the same quantity 

 of mineral phosphates. The intention of the experiments with 

 this section was to test the value of nitrogen from various 

 sources and in dift'erent quantities, as applied along witli the 

 farmyard manure and eoprolites. The weights per acre of the 

 various manurial ingredients and their cost are as under. I 

 refrain from putting a value on the farmyard manure, as the 

 basis of all the plots are equal — 



