10 N. H. Agri. Experiment Station [Bui. 296 



affected by the season, but by the location of the orchard under treat- 

 ment. If we assume that a spray program meeting the 90 per cent 

 clean fruit standard with respect to scab is satisfactory, then experience 

 shows that at a given station one cover may be completely satisfactory 

 in four out of seven years, whereas in another it may never give the 

 required control. Not only does the intensity of scab infection vary 

 with the site, but evidence is accumulating showing that various points 

 on any given site are likely to remain distinctly different as regards 

 intensity of scab infection even through a succession of years. {Hatch 

 Fund.) 



Study Injury from Lime Sulphur Sprays 



Experiments were continued by 0. Butler on the relation of shade to 

 spray injury from lime-sulphur. Previous results seemed to show that 

 when shading increased the dry matter formed, injury was less marked, 

 but during the present year we found in one instance shading increased 

 injury, wiiile in the other there was little or no difference, even though 

 the dry matter formed was greater in the shaded plants. To test effect 

 of soil moisture on gro\\i:h and injury, beans were grown in soil con- 

 taining water at 70 and 40 per cent saturation respectively. Beans 

 grow very much better at the former saturation, but the injury due to 

 spraying was not significantly affected. 



Experiments were continued to test affect on tuber yield of spraying 

 potatoes growing at mean temperatures of 20° C. and 15° C. respec- 

 tively. The loss in yield at 20° C. was 5.30 per cent, at 15° C. was 

 9.75 per cent. When the experiment was discontinued the sprayed 

 plants of the series growing at 20° C. were slightly more yellow than 

 the non-sprayed, and in the cultures growing at 15° C. the differences 

 were even more pronounced. To date no evidence has been obtained 

 that the temperature at which the potatoes are grown has any direct 

 influence on the loss in jdeld due to the spray. 



Experiments were also continued to study the effect of number of 

 applications of lime-sulphur on loss of dry matter. Previously we had 

 found that the loss in weight remained practically constant irrespective 

 of the number of spray applications given and this work was repeated. 

 In one set of experiments beans were harvested, after 1, 2, 3, and 4 

 sprayings; in the other, after 1, 2, and 3 sprayings. The data secured 

 while somewhat irregular, confirmed previous results. No evidence has 

 been secured that lime-sulphur injury is cumulative. Experiments were 

 also made to study the effect of spraying on the upper surface of leaves 

 only, the lower surface only, and both surfaces. In the work apple and 

 tomatoes were used. Spraying both surfaces caused most injury, and 

 the lower surface was not found much if any more sensitive than the 

 upper. {Adams Fund) 



Soil Fertility Studies 



Soil fertility experiments carried on over a period of years include: 

 an experiment with hay on neglected haylands, an experiment with le- 

 gumes on neglected haylands, an experiment with potatoes in a three- 

 year rotation, a fertilizer experiment with legumes in the Connecticut 



