for the entire 10 day intervals until they were eating four times the quantity 

 contained in the basal diet. Six of them remained on the basal diet for the 

 entire 10 weeks to serve as controls. 



Blood and urine samples were taken 24 hours after phosphorus intake 

 and analyzed at regular intervals throughout the experiment for a total of 

 6 collections. All subjects were periodically examined by the University 

 physician. The men remained in good health throughout the experiment. 



On the basis of the blood and urine analyses performed, it does not ap- 

 pear that the varying levels of phosphorus had much, if any, significant 

 effect on the sugar or thiamine levels of the blood. This project is to be 

 published in detail as a Station Bulletin. 



A. M. Light, S. R. Shimer 



Horticulture 



Effect of Hay Mulch and Minerals on Yield of Northern Spy Apples 



Northern Spy apple yields from 1948-1953 were greatest on plots 

 which have received hay mulch since 1942-1945. Trees in mulched plots 

 which received nitrogen plus phosphorus and potassium, or phosphorus 

 plus potassium without nitrogen, gave no significant difference in yield 

 from those grown under mulch without added minerals. Although just short 

 of a 5 percent level of significance, there was an indication that yield was 

 slightly depressed in mulched plots that received phosphorus and potassium 

 without nitrogen. Trees in all hay mulched plots gave better yield than those 

 grown without mulch, although the latter received nitrogen applications. It 

 thus seems apparent that the main effect was an increased yield which re- 

 sulted from hay mulch, and that added minerals produced no additional 

 efifect. 



L. P. Latimer, R. Eggert 



Sources of Magnesium for Apple Trees 



An experiment was set up in 1951 to compare magnesium sulphate, 

 dolomitic limestone, and sulpomag as sources of magnesium for root absorp- 

 tion by young Mcintosh apple trees which were showing symptoms of mag- 

 nesium deficiency. No differential effect due to treatments has yet been in- 

 dicated by visual examination. 



L. P. Latimer, R. Eggert, G. P. Percival 



Annual Cropping Northern Spy Apple Trees Are High Yielders 



Over the period 1946-1953 inclusive, regular annual-bearing northern 

 Spy apple trees produced 50 percent more fruit than biennial-bearing trees. 

 Other trees, intermediate in bearing habit between annual and biennial 

 bearers, produced little more fruit than did strictly biennial bearers. 



L. P. Latimer 



Fruit Trees for Northern New Hampshire 



Plums — Among the tree type plums. Red Coat has been outstanding 



for vigor, hardiness, and production of large, attractive, red fruits of good 



quality. Other promising varieties are : Tecumseh, Pembina, and Minnesota 



No. 101. 



31 



