On July 11, other plots were laid 

 out to compare the effects of several 

 available herbicides containing 2,4-D 

 with each other and with animate. 

 Again animate was more effective 

 than the 2, 4-D formulations. The 

 most effective of the 2, 4-D com- 

 pounds was the butyl ester (Weed- 

 No-More) which in one application 

 destroyed nearly all the Poison Ivy 

 on the area treated and was not 

 greatly inferior to the animate. For 

 some reason, possibly the presence 

 of heavy grass growth on this series 

 of plots, some Poison Ivy persisted 

 on every plot treated. 



In view of the fact that most initial 

 treatments of Poison Ivy with ani- 

 mate and borax require follow-up 

 applications of herbicide, it may well 

 prove as effective in the long-run to 

 use the 2, 4-D esters as the slightly 

 more dependable ammate or borax. 



An application of Weed-No-More, 

 the butyl ester of 2, 4-D, at 1000 

 parts per million was made on July 

 10, 1947, to sweet corn overtopped 

 by Wild Radish and Lambsquarters. 

 On July 11 an application of 500 

 parts per million was tried. The con- 

 ditions on both days were nearly 

 ideal (full sunlight, temperatures of 

 between 70° and 75° F. and moist 

 soil) . Both applications resulted in 

 killing nearly all weeds. No obvious 

 stunting or other injury to the corn 

 was noted on subsequent visits dur- 

 ing the summer. 



Horseradish had overrun an area 

 of valuable land on a farm in Dover. 

 All previous attempts to destroy it 

 had failed. The Horseradish plants 

 were sprayed with 2, 4-D at a con- 



centration of 1000 parts per million 

 in late September 1947. It was noted 

 in the spring of 1948 that most of 

 the plants had been destroyed by the 

 treatment. 



Ammonium trichloroacetate, a pro- 

 duct of the DuPont Company, was 

 provided for experimental use in 

 1947. Complete kills of Quackgrass 

 resulted when ammonium trichloro- 

 acetate was sprayed in water solution 

 on infested areas at the rate of Y* 

 pound of the chemical per gallon. 

 The rate of application was at the 

 rate of one gallon of solution per 

 100 square feet of area. 



Some of the treated plots produced 

 normal and vigorous crops of broad- 

 leaved weeds in wide variety after 

 periods of time varying from one to 

 two months. Grasses, in general, 

 were affected much more than other 

 plants by ammonium trichloroace- 

 tate. Most of the residual effect of 

 the chemical in the soil had dis- 

 appeared within a month. 



Sulfur Cinquefoil is a European 

 weed of relatively recent introduc- 

 tion, but already it has become a 

 dominant field-weed in parts of New 

 Hampshire. The following treat- 

 ments were made in an area of heavy 

 infestation in Greenland in July 

 1947: animate at 3 ounces per gal- 

 lon of water; granular borax at 2 

 pounds per hundred square feet; the 

 ammonium salt of 2, 4-D and the 

 methyl ester of 2, 4-D each at the 

 rate of 1000 parts per million of 

 water. The 2, 4-D compounds des- 

 troyed the Cinquefoil in one appli- 

 cation and caused very little injury 



to grasses. 



A. R. HODGDON 



Dairying 



Clover Hay is More Nutritious tating cows, the digestibility, ap- 

 than Timothy for Dairy Cows. In parent abstrption, and utilization of 

 an experiment with four non-lac- protein and energy were studied to 



12 



