110 Barn and Field Experiments in 1916 



It is seen at once that there is no significant difference be- 

 tween any of these yields. The average yield of the plots on 

 land without potash in 1915 is exactly the same as the yield on 

 land with 7 per cent potash in 1915. The application of potash 

 the year before, therefore, did not affect the yield of oats. 

 Furthermore, in each series the yield of the plots without potash 

 in 1916 is as high as that of the plots with 7 per cent potash. 

 Some of the intermediate plots show slightly decreased yields 

 but in no case is the difference great enough to be significant. 



So far as the results of a single year are concerned, it would 

 appear that on Aroostook soil potash is not a limiting factor 

 in the production of oats. However, too much reliance cannot 

 be placed on a single year's results. It is quite possible that 

 under different seasonal conditions and on different soils quite 

 different results would be secured. 



The experiment is to be repeated in 1917. 



EFFECT OF OMITTING POTASH FERTILIZATION 

 UPON THE POTATO CROP. 



Since the introduction of potash in commercial fertilizers 

 in the early seventies of the last century, many experiments 

 have been made and many treatises written showing the value 

 of potash in crop growing. The experimental data on growing 

 crops without potash are very few. 



Potatoes are the chief cash crop groAvn in ]\Iaine. It is of 

 first importance for the growers to have what facts are available 

 relative to the likelihood of obtaining a crop in 1916 without the 

 application of potash. Foreseeing the possibility that, with 

 the continuance of the war, very little potash would be available 

 for fertilizers, the Maine Agricultural Experiment Station began 

 in 1915, at Aroostook Farm, a series of experiments to determine 

 the effect of different amounts of potash. The results obtained 

 in 1915 were published both in the newspapers and in Bulletin 

 246. 



In 1916 these experiments were repeated on 2 different lots 

 of land. The first series of plots was on land which had been 

 in grass for 2 years. The second series was on land which was 



