AGRICULTURAL RESEARCH IN NEW HAMPSHIRE 33 



resistance. At the sub-zero temperatures required to kill peaches the ap- 

 paratus proved to be inaccurate and unsatisfactory. 



R. Eggert. L. p. Latimer 



Experiments with Blueberries 



Plots were laid out for fertilizer trials with lowbush blueberries using 

 sulphate of ammonia, nitrate of soda, muriate of potash, phosphoric acid, 

 and complete fertilizer of 7-7-7 analysis. Ashes and lime also were applied 

 to other plots in varying concentrations. 



Sulphate of ammonia, nitrate of soda, and 7-7-7 fertilizer, applied at 

 the rate of -500 pounds per acre, produced outstanding increases in growth 

 on all plots to which they, were applied. Neither acid phosphate nor mu- 

 riate of potash were beneficial when applied alone. 



Neither lime nor wood ashes produced any increase in growth when 

 applied at the rate of 100. 500, 1000, or 2000 pounds per acre. 



Additional plots were laid out to study the rate of spread of clons on 

 reclaimed blueberry land. Different treatments, such as burning, sawdust, 

 mulch, and mowang, were employed. 



Under New Hampshire conditions, the furrow method of propagation 

 continues to appear to be the most satisfactory. Rhizomes were planted 

 against the landside of narrow furrows, into which the furrow slice was 

 then replaced and packed. Two-year-old plantings have produced solid 

 rows of plants. 



Ammonium sulfamate, applied as a weed killer in concentrations of 

 YiQ pound, Ys pound, % pound, >^ pound, and 1 pound per gallon of wa- 

 ter, was injurious to blueberries as well as to weeds on all plots. 



Bushes of highbush blueberries, which were growing on both well- 

 drained and on wet, non-porous soils, were fertilized in May, 1943 with 

 300 pounds sulphate of ammonia per acre, and were severely injured dur- 

 ing the past winter. The greatest amount of injury was observed on those 

 plots cultivated until July 15. Zero temperatures on December 11, 13, 14, 

 15. and 16, in the absence of a snow cover, were probably responsible. Soil 

 temperatures during that time went as low as 17°F. The coldest air tem- 

 perature recorded was -12°F on January 17. 1944. Cultivated plots on 

 a well-drained soil and fertilized with acid phosphate and with a 4-24-8 

 mixture showed much less injury and blossomed heavily in 1944. Five- 

 year-old plants of Ifubel. Rancocas, Jersey, Concord, and Cabot varieties 

 were transferred to the Wingate farm near North Barnstead. There, un- 

 der conditions favorable to the growth of wild highbush plants, they were 

 planted for later comparison. 



R. Eggert, A. R. Hodgdon, A. F. Yeager 



Root Stock Studies 



Bark grafting a ring of Sougog purple wood apple around common 

 white weed varieties and the reverse shows that all new wood in such a 

 case comes from the bark ; hence, this should be a suitable way to provide 

 interstocks. 



Florence Crab as well as Virginia seem desirable as a body stock for 

 Mcintosh and Cortland apples. 



A. F. Yeager 



