NEW HAMPSHIRE. 191 



occur throughout July. It was further found that a Large-spored 

 species of Sphseropsis was much more vigorous in producing leaf-spot 

 and was also more conmion on cankers than a small-spored species 

 under investigation. 



The study of the physiological disease known as the point rot of 

 the tomato was entered upon as a new project. Experiments on 

 heavy and light watering of tomato plants in relation to the occur- 

 rence of this disease showed that poorly watered plants were a little 

 more susceptible to the disease than others, but not sufficiently so to 

 indicate that drought is the cause of the malady. Apparently an 

 excess of horse manure in the soil may favor the disease. 



In the dej^artment of entomology, the i^roject on the relation of 

 temperature to the transformations and mortality of insects was prac- 

 tically concluded and the work was discontinued. Considerable 

 progress was made on the better understanding of the factors of tem- 

 perature and moisture on insect life. In connection with the apple- 

 maggot project, attemj)ts were made to determine the length of time 

 that the larvw remain in dropped apples before pupating, this fact 

 having an important bearing on the control of the pest. Poisoning 

 the adult flies with sweetened arsenicals before egg laying gave some 

 valuable results. 



The results secured in the project on the availability of potash in 

 strong clay soils were published in part in Bulletin 142 of the station. 

 The indications are that for the heavy clay soils of the State, as shown 

 by the water-soluble potash present, the amount of potash in the crop, 

 and the amount of soil water required to produce the crop, potash 

 fertilizers are not essential for the production of good crops of clover 

 and grasses. This same line of work was extended to some of the 

 lighter soils, and experiments were also begun to determine the eifect 

 of tillage on soil potash. 



"With Hatch funds the department of agronomj'' carried on variety 

 and fertilizer tests with corn, and experiments with alfalfa, together 

 with meadow and pasture improvement work. This was the fourth 

 season the improvement of Minnesota No. 13 corn was continued, and 

 the results so far indicate that early maturity can be induced, the 

 yield increased, and dent corn kept from assuming the characteristics 

 of the flint type by isolating it from flint varieties. In the fertilizer 

 experiment on grass land begim in 1907, the average yield this season 

 without fertilizer was 1.89G tons of hay per acre, while tne heaviest 

 yield, 3.41 tons, was secured with 400 pounds of nitrate of soda, and 

 the lowest yield, 1.G2 tons, with COO tons of land plaster per acre. An 

 alfalfa plat seeded in July. 1909, yielded this year in 3 cuttings a 

 total of 3.45 tons of hay per acre. On another plat different rates of 

 liming and seed inoculation were tested. An alfalfa nurserv for 



