Agricultural Research in New Hampshire 43 



Timothy. The testing of two strains of timothy is now proceeding 

 on a field scale in various locations in New Hampshire. The two strains 

 include, (1) a late hay strain, and (2) a shorter strawed, but very leafy 

 strain designed for pasture. Seed of both strains has been multiplied so 

 that enough is available for farm as well as comparative testing by the 

 Agricultural Experiment Station. 



F. S. Prince, L. J. Higgins, P. T. Blood 



The Use of Herbicides in New Hampshire 

 With Particular Reference to Pastures 



The following herbicide treatments were made: 



(1) 2,4-D in carbowax and either the sodium or ammonium salt of 

 2,4-D as well were applied in water solution at different times 

 and under different environmental conditions to the follow- 

 ing weeds in pastures and fields: (a) Field Buttercup, Ranuncu- 

 lus acris, (b) Bindweed, Convolvulus sepium, (c) Poison Ivy, 

 Rhus radicans, (d) Yellow Rocket, Bar bare a vulgaris, (e) Cana- 

 da Thistle, Circium arvense, and (f) Yellow Devil's Paintbrush, 

 Hieracium pratense. 



(2) Broadcast applications of granular Borax Na 2 b 4 7 .6H 2 

 were made on the above-named weeds with the exception of 

 Yellow Rocket. 



(3) Applications of Ammate at three ounces and at six ounces per 

 gallon of water were applied to Field Buttercup, Bindweed, 

 Canada Thistle, and Hieracium. Ammate at 12 ounces per gal- 

 lon was used on Poison Ivy. 



(4) Sinox was tried but was discontinued on perennial weeds. 



(5) 2,4-D at one part to 1000 parts of water and Ammate at three 

 ounces per gallon were applied to a number of lawns at dif- 

 ferent times and under varying conditions. 



(6) Several species of miscellaneous weeds were treated with the 

 above-named herbicides. 



In general, the 1945 results showed that Ammate at three ounces per 

 gallon of water is effective against a variety of pasture and field weeds in 

 late spring treatments. Clovers tend to be destroyed temporarily but come 

 back after a few months. Grasses tend to be stimulated. In many cases 

 where Ammate failed, 2,4-D acid and its salts of Ammonia and Sodium 

 proved effective, but proved distinctly inferior to Ammate in the treat- 

 ment of Buttercup and somewhat inferior in the case of Paintbrush. 



Borax in heavy applications showed promise in long-time pasture 

 renovation. Plots treated several years ago with Borax at two to three 

 pounds per hundred square feet showed excellent grass and clover growth 

 in 1945, while adjacent untreated plots were quite valueless as pasture. 



The results, in general, indicate that most herbaceous pasture and 

 field weeds lend themselves to herbicide treatments. A combination of 



