1891.] PUBLIC DOCUMENT— No. 33. 157 



The absence of nitrogen in the manurial matter applied 

 to plats 4, 7, 9, is accompanied by the lowest yield in dry 

 matter in the grain ; the yield of dried grain in case of plats 

 4, 7, 9, averages 67.9 per cent., and in case of the remain- 

 ing plats, excluding Plat 8 for stated reasons, it averages 90.8 

 per cent. The plats containing potash-magnesia sulphate as 

 the potash source, namely, plats 2, 5, 10, have yielded the 

 largest amount of grain ; each of these plats received its 

 nitrogen supply in a different form, — ammonium sulphate, 

 blood, and nitrate of soda. The field (A) has been seeded 

 with winter rye during the late autumn, to continue the 

 investigation in the same direction. 



