118 



Barn and Field Experiments in 1916 



ing. The experiment was again repeated in 1916, using dupli- 

 cate plots of about one-half acre each. 



The fertilizer used each year was high grade, carrying 4 

 per cent nitrogen, 8 per cent available phosphoric acid and 7 

 per cent water soluble potash. One-third of the nitrogen was 

 in the form of nitrate of soda, and the remainder was high 

 grade organic nitrogen. The yields are based upon weighings 

 and not upon measure. The potatoes were clean, without ad- 

 hering soil. 



In potato experiments at Highmoor Farm the Station had 

 found that when there was only a small amount of rainfall fol- 

 lowing the second application of fertilizer that apparently this 

 added fertilizer was not well utilized. Each season, however, at 

 Aroostook Farm there was ample water to dissolve and render 

 the plant food in all of the fertilizer available. It has been es- 

 timated that it takes about 6 inches of water to successfully 

 grow a crop of potatoes. The rainfall in each of the years 1914 

 and 1915 totaled over 12 inches in May, June, July, and August, 

 and in 1916 over 11 inches in these months. 



The results obtained in 1914 and 1915 are reported in de- 

 tail in Bulletin 246. The yields per acre obtained in 1916 are 

 as follows : 



Yield per Acre Obtained in Method of Applying Fertiliser 

 Experiment, ipi6 





Treatment 



Blsrchn 



ntable 



Culls 



Plot No. 



Bbls. 



Bus. 



Bbls. 



Bus. 



446 



469 



Average 



1590 lbs. in planter 

 1500 lbs. in planter 



lOOO lbs. in planter, 500 

 lbs. when up 



lOOD lbs. broadcast, 500 

 lbs. when up 



1500 lbs. broadcast 

 1500 lbs. broadcast ■ 



141.8 

 145.5 

 143.7 



390 

 400 

 396 



5.7 

 1.0 

 3.3 



16 

 3 

 9 



447 



461 



.Average 



139.3 

 140.3 

 139.8 



383 

 386 

 384 



2.8 

 2.5 



2.7 



8 



7 

 7 



448 



462 



Average 



130.4 

 129.7 

 130.0 



358 

 356 

 357 



0.6 

 1.5 

 1.1 



2 

 5 

 3 



449 



463 



Average 



1.34.6 

 127.6 

 131.1 



370 

 351 

 360 



1.0 

 0.5 

 0.8 



3 



1 

 2 



