AGRICULTURAL RESEARCH IN NEW HAMPSHIRE 25 



half receiving nitrogen alone. The amount of total nitrates in parts per 

 million stayed fairly low throughout the season. The amount of available 

 potassium was higher on fertilized plots and the available phosphorus was 

 fairly uniform throughout. Due to the severe winter considerable winter 

 killing occurred in this pasture ; however, the completely fertilized plots 

 wintered the best, due to location. They were again fertilized this spring 

 with varying amounts of complete fertilizer. Samples of pure stand of 

 Ladino and red clover were taken in order to ascertain whether or not in- 

 creasing amounts of potash applied as a fertilizer decrease the calcium con- 

 tent of clover significantly. These samples will be analyzed during the 

 coming year. 



F. S. Prince, P. T. Blood, G. P. Percival 



The Relation of Potash Levels to the 

 Persistence of Clover in Hay Stands 



This project is located on a terrace of the Connecticut River. 



Plots 1 to 46 inclusive were reseeded in 1942 and harvested twice in 

 1943 after having been top-dressed with potash variables supplementing 

 the application of uniform nitrogen and phosphoric acid early in May. The 

 resulting yields were evidence of the efficiency of manure and potash in the 

 production of hay. 



Yield in pounds per acre 



Increase due 

 Treatment per acre Total to treatment 



1. Check plot - no treatment 



2. 10 tons manure at seeding 



3. 20 tons manure at seeding 



4. 100 pounds muriate annually 



5. 200 pounds muriate annually 



6. 300 pounds muriate annually 



7. 20 pounds borax and 8-16-16 



It is too early in the test to draw conclusions concerning the persist- 

 ence of clover. 



On the unplowed portion of the field, plots 47 to 80 inclusive, the 

 grass was harvested only once in 1943. Clover still persisted in the plots 

 which had been treated wath potash consistently. 



