Agricultural Research in N. H. 35 



siderable time and expense are saved because no standard log-deck is needed 

 for truck loading under this system. 



With reference to the conical splitting wedge previously reported, one 

 company has mounted a similarly made wedge on the power take-off of a 

 standard wheel tractor. Further study will be made of this interesting adapta- 

 tion. 



During the year, exhibits on labor-saving equipment have been shown 

 throughout the state under the auspices of the Agricultural Extension Serv- 

 ice. Information was supplied to the exhibitors with reference to device* 

 which have been described. Photographs were made available to the exhib- 

 itors. 



L. C. Swain 



FRUITS 



Leaf Scorch in Deciduous Fruit Plantings 



Sod culture, and hay, sawdust, or seaweed used as mulch have had no 

 differential effect on leaf scorch of apple trees. None of the treatments has 

 reduced the severity of leaf scorch on Mcintosh apple trees under test. The 

 type of leaf scorch studied is apparently related to the interaction of potas- 

 sium, calcium, and magnesium in the soil and in the three. The soil of the 

 block under test in the University orchard runs high in potassium and is 

 relatively well supplied with magnesium, yet chemical analysis shows that 

 the trees are deficient in magnesium. Leaf scorch occurs when the magne- 

 sium content of the leaves falls to 0.19 per cent or 0.18 per cent dry weight 

 basis. 



Mcintosh seedlings grown in culture solution in the greenhouse failed 

 to send out new roots and then died when the nutrient was supplied with 

 magnesium sulfate, due possibly to the low pH of the medium. Magnesium 

 ammonium phosphate, however, resulted in the development of new roots 

 and some leaf growth of the seedlings. Some promise is shown in the use of 

 organic forms of magnesium. 



L. P. Latimer, G. P. Percival, S. Dunn 



Body Stocks and Understocks for New Hampshire Apples 



Cortlands and Mcintosh came into bearing on all trees that were seven 

 years old this year. The Virginia Crab and Florence Crab apple trees worked 

 to Cortland and Mcintosh are bearing as much fruit as the same varieties on 

 Mailing No. 4 roots or on seedling roots. All trees are seven years old. 



Robosta trees used for a body stock are self-rooted and have been diffi- 

 cult to train into well-shaped trees due to their bush type of growth. How- 

 ever, they take the scion well, and up to the present time, make excellent 

 trees. They are four years old, and were top-worked two years ago. 



Northern Spy and Mcintosh are fruiting heavily on Mailing No. 1, at 

 the age of eight years. 



W. W. Smith 



