NITRATE VERSUS AM MOM l.M SA ITS i:, 



soil started with a gootl sup})ly of chalk. Analyses iua<lr in 

 1904, show that the soil of Plot 7 si ill contains more than 

 *2\ per cent, of carbonate of lime. 



Total fVoduce 

 per Acre 



6000 lb — 



Grain per Acre . lb 



Fig. 4.— Comparison of Nitrate of Soda and Aninioniuni-salLs on \Mi. af. 

 10 years (1 893-1902). -Ml Plots receive Minerals alike. 



It should be noticed that the increase <»f crop for cac-h 

 application of nitrogen is not proportional to the e.xiia nitrogen 

 .supplied, but that each successive addition gives a smaller 

 return in the crop. Thus l^ot G with 4:J lb. of nitrogen gives 



