FIELD EXPERIMENTS IN 1915. 



17 



The land had been in grass for two years, one year in oats 

 and the year before that had been in potatoes. No ■ fertilizer 

 had been used since the potato crop of 191 1. In each case the 

 . fertilizer was applied at the time of planting, at the rate of 

 1.500 pounds per acre. Other than the amount of potash used, 

 all the plots were treated exactly alike. Lowell Green Moun- 

 tain potatoes were used for seed. 



These experiments were carried out in duplicate on half 

 acre plots Nos. 137 to 140 and 150 to 153. 



The fertilizers were sampled just before planting. The 

 results of the analyses are given in the table that follows: 



Analyses of Fertilisers Used in No Potash Experiment, 1915. 







Nitrogen. 





Available 

 phosphoric 















Potash 



Plot Nos. 



As 



As 



As 





acid 



% 





nitrate 



ammonia 



organic 



Total 



% 







% 



% 



% 



% 







137, 150 



1.48 



1.30 



1.63 



4.41 



8.87' 



0.00 



138, 151 



1.35 



1.20' 



1.56 



4.11 



8.46 



2.20 



139, 152 



1.36 



1.16 



1.54 



4.06 



8.08 



4.99 



140, 153 



1.38 



1.30 



1.52 



4.20 



8.23 



8.13 



The planting and harvesting dates are shown in the -table. 

 Dates of Planting and Harvesting. 



Plot No. 



Date planted ! Date harvested 



I ot No. 



137 

 138 

 139 

 140 



May 21, 1915 



May 21, 1915 



May 21, 1915 



May 21, 1915 



Sept. 30, 1915 



Oct. 1, 1915 



Oct. 1, 1915 



Oct. 1, 1915 



150 

 151 

 152 

 153 



Date planted Date harvested 



May 24, 1915jOct. 6, 1915 



May 24, 1915 Oct. 6, 1915 



May 24, 1915 Oct. 6, 1915 



May 25, 1915 Oct. 6, 1915 



All the plots were thoroughly cultivated and sprayed. There 

 was ample rainfall during the growing season. The planting 

 was made after the last heavy rain (May 19) of the spring. 



Throughout the growing season the vines on both the no 

 potash plots were a distinctly brighter green and had a thriftier 

 look than on the adjoining plots. The difference was so 

 marked that it attracted much attention from visitors at the 

 farm. The yields are given in the table that follows. 



