May, 1937] Agricultural Research in N. H., 1936 7 



wide, the inner edge of which was 1^4 inches from center; i.e. as close 

 to the seed piece as was practical without contact. 



In the set of potatoes grown at mean temperature of 18-20° C, the 

 rate of emergence of the fertilized plants was slower than that of the 

 non-fertilized in a ratio of 1.57 for whole seed, 1.20 for apical seed, 1.18 

 for basal seed as contrasted with 1 for the non-fertilized seed. In the 

 series grown at 14-15° C, the rate of emergence was approximately the 

 same for both the non-fertilized and fertilized seed. 



The growth of the plants at the time the first measurements were 

 taken following emergence showed in every case the fertilized series 

 smaller than the non-fertilized irrespective of temperature at which 

 grown, but it was noticed at the same time that the longer emergence 

 was delayed the less marked was the difference in the height of the 

 plants. Eventually the fertilized plants outgrow the non-fertilized. 



In another experiment the plants were grown at a mean temperature 

 of 20.8'' C. and the fertilizer was used at the same rate as in the first 

 experiment, but two different placements with respect to the seed pieces 

 were used. In one series the inner edge of the band of fertilizer was 

 114 inches from center, in the other 1% inches from center. The fer- 

 tilizer placed close to the seed delayed emergence as in the other exper- 

 iment, but the more distant placement was without noticeable effect. 

 However, the amount of growth of the plants in both the fertilized 

 series at the time first measurements were taken was less than in the 

 non-fertilized series. Within the next seven days the growth of the 

 fertilized plants in the case of the whole seed was greater than that of 

 the non-fertilized plants, but in the case of the cut seed similar results 

 were obtained only after the lapse of 14 days. {Adams Fund) 



Bitter-Pit Less at Late Pickings 



Evidence accumulates that bitter-pit develops in storage much less 

 when apples are picked late in the season. Fruit from trees bearing 

 bitter-pitted apples was stored and examined by 0. Butler in January. 

 Apples picked on October 1 showed 52 per cent having external symp- 

 toms developed in storage, w^iereas apples picked on October 10 showed 

 only 6 per cent with external symptoms, and apples picked on October 

 21 and October 30 showed no external symptoms. In so far as internal 

 symptoms are concerned, the percentage for the various stages ran res- 

 pectively 0, 27, 66, and 9. {Purnell Fund) 



Potato Mosaic Elasked Under Favorable Conditions 



In the study of the effect of place on mosaic and leaf-roll of the po- 

 tato no loss of vitality was observed from one generation to the next 

 in mosaic plants in spite of the fact that the seventh generation was 

 grown in one set and the third in another. Mosaic symptoms appeared 

 in the plants grown at 15° C. after the same lapse of time irrespective 

 of previous history, and yields were lower than in the plants grown at 

 20° C. The increase in yield at the higher temperature is due to the 

 more normal metabolism that accompanies masking of mosaic symp- 

 toms. The degree of masking is also affected very markedly by the 



