84 MASS. EXPERIMENT STATION BULLETIN 190. 



Certain varieties called for by the plan for this investigation of the inter- 

 relation of stock and scion have been planted in all or nearly all of the six 

 lots grown during the period of this investigation. Table 5 shows the 

 percentages rooting from the scion in these lots. There is considerable 

 variation from year to year in the different varieties, due, probably, to a 

 variety of causes. As has been stated, a part of Series 1 was grown in 

 Westfield, Mass., and the rest at Amherst. Series 2 was grown in Amherst 

 adjoining Series 1, and under very similar soil conditions. Series 4 was 

 on another adjoining plot and similar to the others, except that it contained 

 a considerable amount of land that was rather wet. This did not visibly 

 affect the growth of the trees, but may have interfered with root forma- 

 tion. Another portion failed to give a good stand of trees. This was 

 given some special investigation without bringing to light any satisfactory 

 reason for the poor growth. Series 3, 5 and 6 were grown in another 

 field on plots not far apart and on similar soils. Like the other plots 

 these were a fine sandy loam. Series 6 was grown on a plot a consid- 

 erable portion of which was rather poorly drained, which may have been 

 the cause wholly, or in part, of the poor rooting from the scion. The 

 stand was good and the trees all made a fair growth. Series 5 was grown 

 on well-drained soil and made a good growth. It is difficult to say why 

 the general average of rooting is so low. 



In Series 1 the varieties showing low percentages of rooting are gen- 

 erally those maturing growth rather late, while the early maturing va- 

 rieties, such as Jewett, Oldenburg, Wealthy and Yellow Transparent, 

 rooted better than in most other years. If this is significant it may mean 

 that the scion contained a greater supply of stored food, due to conditions 

 the previous season rather than any conditions during the two seasons 

 while the tree was growing. 



Taken as a whole, these figures show clearly the wide range of variation 

 between different varieties, whatever are the conditions of growth of 

 the scion before cutting, or of the graft. Bough roots in nearly every 

 case, while Tolman roots in very few cases. The relatively high per 

 cent of Tolman in Series 3 may be looked on as a chance variation due to 

 small numbers. 



