72 



MASS. EXPERIMENT STATION BULLETIN 327 



varieties Cabot, Pioneer, and Rubel. These plots are to be used for cultural 

 experiments. 



The experiment started in 1934 to test the effect of varying amounts of lime 

 and of sulfur on blueberry plants in Wagner pots was continued. The plants 

 used in 1934 were removed and a new set of two-year-old Rubel plants set in 

 their places. The general trend of results was the same as in 1934 except that 

 there was increasing evidence of sulfur toxicity. Most of the plants in the 

 sulfur-treated pots died soon after planting. The plants in the pots which re- 

 ceived 5 gms. of sulfur made a very poor growth in 1935 although they made 

 the best growth in 1934. 



The average total shoot growth per plant for 1935, the average total height 

 of plants, and the pH for each treatment is given in the following table. 



Average total Average 



Treatment growth in height in pH 



inches inches 



Check 35.3 11.7 4.60 



Lime 10 gms. 47.0 18.3 5.20 



Lime 20 34.3 10.0 5.50 



Lime 30 31.7 13.3 5.55 



Lime 40 (2) 21.7 9.0 5.75 



Lime 60 (2) 29.5 13.0 6.75 



Lime 80 25.0 9.3 6.75 



Peat 64.7 28.0 4.80 



Peat + lime 10 gms 56.0 21.7 5 



Peat + Hme 20 46.0 16.0 5 



Peat + lime 30 35.7 15.0 5 



Peat + lime40 26.7 9.7 5 



Peat + lime 60 34.3 11.7 6. 



Peat + lime 80 22.0 9.3 6. 



Peat + sulfur 5 gm. (2) 36.0 10.5 4. 



00 

 30 



70 

 95 

 45 

 65 

 35 



Growth measurements are averages of three plants unless otherwise noted. 

 With heavier sulfur treatments all plants died. 



An experiment was started in the spring of 1935 to test the self-fertility or 

 self-sterility of varieites of blueberries. Most of the plants were under a large 

 tent of tobacco cloth but some were in individual cages. All blossoms were 

 hand-pollinated several times during the blooming season. A number of flower 

 clusters on each of several bushes of a variety were tagged, the blossoms counted 

 and the percentage of set obtained from these tagged clusters. 



The percentages of set obtained were as follows: 



Concord 74.3 



FI-66 60.9 



Stanley 56.5 



Scammell 52.2 



Rubel 49.0 



Cabot 48.0 



Jersey 38.2 



Rancocas 37.1 



11.0 



10.4 



6.7 



6.3 



2.6 



2.2 



1.1 



Harding 0.8 



Katherine. 

 Wareham . 



Pioneer 



Durfee 



Adams 



Sam 



Grover 



Some of the berries which set on these bushes were small and had relatively 

 few seeds. 



In the summer of 1935 an experiment was started to try out the acidification 



