creasing the cobalt content of timothy, only the 5 pound appUcation in- 

 creased it well above the adequate requirement. 



Nitrogen restricted the uptake of added cobalt. Lime and nitrogen 

 each restricted the uptake of manganese; when applied together, they re- 

 duced the manganese content to about 1/3 of that found in the untreated 

 plant. 



G. P. Percival 



Carotene Content of Grass and Clover Ensiled 

 with Different Preservatives 



Fifty-five gallon oil drums painted inside with rubber-base paint and 

 lined with Sisalcraft paper were used in tests to compare various methods of 

 preserving silage. Weighed forage samples were placed in the middle of each 

 drum in Lumite plastic-screen cloth bags. The content of each drum was 

 weighted with sand to approximate silage conditions. 



A cutting predominantly of grass was preserved with sodium bisulfite, 

 and a cutting predominantly of red clover was treated with sodium bisulfite, 

 dried stabilized molasses, and calcium formate. A check sample without pre- 

 servative was also ensiled. 



The loss of carotene from the original samples was used to determine 

 the value of the treatment. Sodium bisulfite proved to be a very satisfactory 

 preservative, and dried stabilized molasses was next in value, closely fol- 

 lowed by the untreated sample. There was considerable loss of carotene in 

 the silage treated with calcium formate. 



All of the materials used were easier to handle than sulfur dioxide gas 

 or liquid molasses. In all of the test treatments the silage had a good odor. 



G. P. Percival 



OTHER ACTIVE PROJECTS 

 Prevention of Discoloration of Pre-Peeled Raw Potatoes 



W. A. AVERILL 



Soluble Substances in Grass and Legume Silages 



T. G. Phillips 



Agricultural Economics 



Tank-Truck Assembly of Milk in New Hampshire 



Competition for the sale of milk and milk products necessitates that 

 every endeavor be made to reduce the costs of production, processing, and 

 distribution. The introduction of farm bulk tanks and tank-truck collection 

 is a move in this direction. 



This study poses the problem created by numerous small farms and 

 dealers in New Hampshire and estimates the costs and savings for pro- 

 ducers, assemblers, and dealers. The choice of the right size of tank or tank- 

 truck in relation to potential production is a major determinant of cost. 

 Herd expansion must meet the problem of markets at a time when milk pro- 

 duction per cow and per herd is creating surplus milk problems in New 

 England, 



9 



