140 



MAINE STATE COLLEGE 



In the spring of the present year this field was seeded to oats 

 and clover, with the object of getting a clover sod to determine 

 its effect on the insoluble phosphoric acid of the South Carolina 

 rock. A good catch of clover was obtained over the entire field. 

 The result of the oat crop is shown in table K. 



TABLE K. 



Amount of fertilizers applied 

 per acre in 1890. 



Yield of oats per 

 acre in 1891. 



Calculated yield 

 per acre with- 

 out fertilizers. 







!i 



IS 



O 





Grain. ■ Straw. 



Grain. 



Straw. | Grain. 



Straw. 



Plotl.. 





1536 lbs 



2282 lbs 



1317 lbs 

 1252 lbs 



1187 lbs 



219 lbs 



1095 lbs 





1000 lbs. S. C. rock 



1447 lbs 



1534 lbs 

 1449 lbs 



1129 lbs 



195 lbs 











Plot 2.. 



16 lbs. sulphate of ammonia. . 

 100 lbs. muriate of potash .... 



405 lbs 



Plot 3.- 



500 lbs. acid S. C rock 



16 lbs. sulphate of ammonia.. 

 100 lbs. muriate of potash 



1523 lbs 



1043 lbs 



940;ibs 



480 lbs 



103 lbs 



Plot 4.. 



1304 lbs 



1176 lbs 









Last year's report of this work with a barley crop shows that 

 the acid South Carolina rock produced the largest increase in the 

 yield of grain, that stable manure produced the next largest 

 increase and the crude South Carolina rock the least. The result 

 of this year's work shows that the same order is maintained with 

 the oat crop. 



Reference to the report of last year shows that peas gave a 

 larger increase with crude South Carolina rock thau with acid rock. 

 Too little data has been obtained from which to form sweeping 

 o-eneralizations as to relative ability of different classes of plants 

 to gather their phosphoric acid from crude phosphates. But the 

 writer is inclined to the belief, from the results obtaiuecl on this 

 field and on Experimental Field No. 1, together with those 

 obtained in the Leland experiment, a report of which follows, 

 that leguminous plants are better adapted to this purpose than the 

 cereals. 



On Peas as a Crop to Precede Grain. 



Leguminous plants have been designated as collectors of nitro- 

 gen and the cereals as dissipators of nitrogen. Many practical 

 men have generalized from this that all leguminous crops are 



