22 N. H. AGR. EXPERIMENT STATION. [Bulletin 192 



grown in both water and sand cultures. It has been clearly shown that each 

 of the three plants requires a supply of potassium, in addition to that stored 

 in the seed itself, within a few days after germination. The symptoms of 

 potassium starvation have been observed and described for each of the three 

 plants. Practically all of the experimental data has been secured and the 

 project should be completed and submitted for pubUcation at an early date. 



REPORT OF THE DEPARTMENT OF DAIRY 



HUSBANDRY. 



J. H. PULLER. 



The Dairy Husbandry Department, during the year, had 201 cows on test 

 in the semi-official work. Ninety-three seven-day tests were completed in this 

 period. The Advanced Registry testing is the only Station work conducted by 

 this department. 



REPORT OF THE DEPARTMENT OF 

 ENTOMOLOGY. 



w. c, o'kaije. 



There has been no change in the personnel of the staff of this Department 

 since the projection of the last report. The entomologist has continued to 

 exercise supervision over the work of the Department in general. Both the 

 entomologist and the assistant entomologist have direct charge of those 

 investigations and experimental projects which will be considered more in 

 detail below. 



The Department has, dm-ing the period covered by this report, been called 

 upon to carry a rather heavy volume of correspondence. There have been 

 1,212 letters WTitten by the Department during this time, many of these con- 

 cerned primarily with inquiries from people all over the state regarding insect 

 injury and requests for information regarding the control of insect pests. 

 There seems to be every year a tendency toward this type of service assuming 

 larger and larger proportions. 



Several lectures have been deUvered before Grange or other agricultural 

 meetings deahng with the subject of important insect pests and their control 

 in the state. In addition to lectures concerned primarily with insect pests 

 and their control, the entomologist has been called upon to deliver an imusually 

 large number of lectures in all parts of the state in connection with his work as 

 vice-chairman of the Food Production Committee and as manager of the New 

 Hampshire Emergency Food Production Campaign. Both the entomologist 

 and the assistant entomologist, in common with most others during the dura- 

 tion of the war, have been called upon, occasionally, to render special service 

 in connection with various lines of war work. 



In addition to his duties as entomologist to the Experiment Station and pro- 

 fessor of economic entomology, the entomologist is deputy commissioner of 



