114 



HATCH EXPERIMENT STATION 



[Jan. 



from the soil under cultivation, as well as of a definite ad- 

 ditional supply of nitrogen in different forms of combination 

 on the character and yield of the crop selected for the trial. 

 Several plats (4, 7, 9) which for five preceding years 

 (1883 to 1889) had not received any nitrogen compound for 

 manurial purposes were retained in that state, to study the 

 effect of an entire exclusion of nitrogen-containing manurial 

 substances on the crop under cultivation ; while the remain- 

 msc ones received, as before, a definite amount of nitrogen 

 in the same form in which they had received it in preceding 

 years, namely, either as sodium nitrate (1, 2), as ammonium 

 sulphate (5, 6, 8), as organic nitrogenous matter in form 

 of dried blood (3, 10) or of barn-yard manure (0). A cor- 

 responding amount of availaljle nitrogen was applied in all 

 these cases. 



Annual Supply of Manurial Substances. 



Plat 6, 



Plat 7, 

 Plat 8, 



Plat 9, 

 Plat 10, 



800 lbs. of barn-yard manure, 32 lbs. of potash-magnesia sulphate and 



18 lbs. of dissolved bone-black. 

 29 lbs. sodium nitrate (=4 to 5 lbs. nitrogen), 25 lbs. muriate of 



potash (= 12 to 13 lbs. potassium oxide), and 50 lbs. dissolved 



t)one-black (=8.5 lbs. available phosphoric acid). 

 29 lbs. sodium nitrate (= 4 to 5 lbs. nitrogen), 48.5 lbs. potash- 

 magnesia sulphate (= 12 to 13 lbs. potassium oxide), and 50 lbs. 



dissolved bone-black (=8 5 lbs. available phosphoric acid). 

 43 lbs. dried blood (=5 to 6 lbs. nitrogen), 25 lbs. muriate of potash 



(= 12 to 13 lbs. potassium oxide), and 50 lbs. dissolved bone-black 



(= 8.5 lbs. available phosphoric acid). 

 25 lbs. muriate of potash (= 12 to 13 lbs. potassium oxide) and 50 



lbs. dissolved bone-black (= 8.5 lbs. available phosphoric acid). 

 22.5 lbs. ammonium sulphate (=4 to 5 lbs. nitrogen), 48.5 lbs. potash- 

 magnesia sulphate (= 12 to 13 llis. potassium oxide), and 50 lbs. 



dissolved bone-black (=8.5 lbs. available phosphoric acid). 

 22.5 lbs. ammonium sulphate (=4 to 5 lbs. nitrogen), 25 lbs. muriate 



of potash (= 12 to 13 11)S. potassium oxide), and 50 lbs. dissolved 



bone-black (== 8.5 lbs. available phosphoric acid). 

 25 lbs. muriate of potash (= 12 to 13 lbs. potassium oxide) and 50 



lbs. dissolved bone-black (=8.5 lbs. available phosphoric acid). 

 22.5 lbs. ammonium sulphate (= 4 to 5 lbs. nitrogen), 25 lbs. muriate 



of potash (= 12 to 13 lbs. potassium oxide), and 50 lbs. dissolved 



bone-black (= 8.5 lbs. available phosphoric acid). 

 25 lbs. muriate of potash (== 12 to 13 lbs. potassium oxide) and 50 



lbs. dissolved bone-black (= 8.5 lbs. available phosphoric acid). 

 43 lbs. dried blood (= 5 to 6 lbs. nitrogen), 48.5 lbs. potash-magnesia 



sulphate (= 12 to 13 lbs. potassium oxide), and 50 lbs. dissolved 



bone-black (=: 8.5 lbs. available phosphoric acid). 



