136 



HATCH EXPERIMENT STATION. 



[Jan. 



each. The materials used as sources of nitrogen and potash 

 furnisli nitrogen at the rate of 52 pounds and potash at the 

 rate of 152 pounds per acre. With some crops a supple- 

 mentary application of a (juick-acting nitrogen fertilizer has 

 been made to all plots alike. The crops which have been 

 grown in this field during the progress of the experiment are 

 as follows : corn, cabbages, corn, in 1900 two crops, — oats 

 and Hungarian grass (both for hay), onions, and onions. 

 With the exception of the onions, all the crops })reviously 

 grown in this field have given good yields, even on the three 

 plots in the field which have received no phosphate. 



The soil of the field at the beginning of the experiment 

 was not quite even in (luality throughout. Plot 1 surpassed 

 any other in the field in fertility at the start, and on the 

 Avhole (although the difierence is not very marked) there 

 ap})ears to be a gradual natural decline in productiveness 

 from this end of the field toward the other. 



The crop of the present season was cabbages. The variety 

 is the Danish Ball-head. The seed was sown at the usual 

 time for the crop in this locality, but so abnormally cold 

 was the season that the crop was far from mature when cold 

 weather set in. Still, the yields (which include Aveight of 

 stumps, loose leaves ajid soft heads, as Avell as the weight 

 of hard heads and totals) make it possible to estimate the 

 relative availability of the diflerent phosphates to the crop 

 grown. The rates of yield per acre are shown in the follow- 

 ing table : — 



('(ilibagcs on Plots irifh Kipail Amounts of Phosphoric Arid. 



